{"id":3493,"date":"2026-07-02T05:55:24","date_gmt":"2026-07-02T05:55:24","guid":{"rendered":"https:\/\/china-timing-pulley.xyz\/?post_type=product&p=3493"},"modified":"2026-07-02T07:02:03","modified_gmt":"2026-07-02T07:02:03","slug":"ep-xl-5-08mm-aluminum-straight-bore-timing-pulley","status":"publish","type":"product","link":"https:\/\/china-timing-pulley.xyz\/ar\/product\/ep-xl-5-08mm-aluminum-straight-bore-timing-pulley\/","title":{"rendered":"\u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0645\u0633\u062a\u0642\u064a\u0645\u0629 \u0645\u0646 \u0627\u0644\u0623\u0644\u0648\u0645\u0646\u064a\u0648\u0645 EP-XL \u0628\u0642\u0637\u0631 5.08 \u0645\u0645"},"content":{"rendered":"
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\u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0645\u0633\u062a\u0642\u064a\u0645\u0629 \u0645\u0646 \u0627\u0644\u0623\u0644\u0648\u0645\u0646\u064a\u0648\u0645 EP-XL \u0628\u0642\u0637\u0631 5.08 \u0645\u0645<\/h1>\n

Precision Machined XL Pitch Straight Bore Timing Belt Pulley \u2014 Aluminum and Steel, 10 to 72 Teeth, Global Supply<\/p>\n

XL Pitch: 5.08 mm | Material: AL or STEEL | Type: 6F \/ 6 \/ 6W | Bore Type: Straight Bore<\/div>\n<\/div>\n

1. XL 037 (5.08 mm) \u2014 Full Dimensional Specification Table<\/h2>\n

All dimensions in millimeters. Dp = Pitch Diameter; De = Outside Diameter; Df = Flange Diameter; Dm = Body Diameter; Di = Inner Diameter; F = Face Width; L = Hub Length; d = Bore Reference. Material: AL (Aluminum) or STEEL. Dash (\u2014) indicates dimension not applicable for that type.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u0631\u0645\u0632 \u0627\u0644\u0642\u0637\u0639\u0629<\/th>\n\u0623\u0633\u0646\u0627\u0646<\/th>\n\u064a\u0643\u062a\u0628<\/th>\n\u0645\u0627\u062f\u0629<\/th>\n\u062f\u064a \u0628\u064a<\/th>\n\u062f\u064a<\/th>\nDf<\/th>\nDm<\/th>\nF<\/th>\n\u0644<\/th>\n\u062f<\/th>\n\u0631\u0642\u0645 \u0627\u0644\u0634\u0641\u0629<\/th>\n<\/tr>\n<\/thead>\n
10 XL 037<\/td>\n10<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n16.17<\/td>\n15.66<\/td>\n23<\/td>\n9.5<\/td>\n14.3<\/td>\n20<\/td>\n\u2014<\/td>\n1<\/td>\n<\/tr>\n
11 XL 037<\/td>\n11<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n17.79<\/td>\n17.28<\/td>\n23<\/td>\n9.5<\/td>\n14.3<\/td>\n20<\/td>\n\u2014<\/td>\n1<\/td>\n<\/tr>\n
12 XL 037<\/td>\n12<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n19.40<\/td>\n18.90<\/td>\n25<\/td>\n10<\/td>\n14.3<\/td>\n20<\/td>\n\u2014<\/td>\n2<\/td>\n<\/tr>\n
13 XL 037<\/td>\n13<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n21.02<\/td>\n20.51<\/td>\n25<\/td>\n10<\/td>\n14.3<\/td>\n20<\/td>\n\u2014<\/td>\n2<\/td>\n<\/tr>\n
14 XL 037<\/td>\n14<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n22.64<\/td>\n22.13<\/td>\n28<\/td>\n15<\/td>\n14.3<\/td>\n20<\/td>\n\u2014<\/td>\n4<\/td>\n<\/tr>\n
15 XL 037<\/td>\n15<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n24.26<\/td>\n23.75<\/td>\n28<\/td>\n15<\/td>\n14.3<\/td>\n20<\/td>\n\u2014<\/td>\n4<\/td>\n<\/tr>\n
16 XL 037<\/td>\n16<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n25.87<\/td>\n25.36<\/td>\n32<\/td>\n16<\/td>\n14.3<\/td>\n20<\/td>\n\u2014<\/td>\n5<\/td>\n<\/tr>\n
17 XL 037<\/td>\n17<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n27.49<\/td>\n26.98<\/td>\n32<\/td>\n20<\/td>\n14.3<\/td>\n20<\/td>\n\u2014<\/td>\n6<\/td>\n<\/tr>\n
18 XL 037<\/td>\n18<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n29.11<\/td>\n28.60<\/td>\n35<\/td>\n20<\/td>\n14.3<\/td>\n20<\/td>\n\u2014<\/td>\n7<\/td>\n<\/tr>\n
19 XL 037<\/td>\n19<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n30.72<\/td>\n30.22<\/td>\n35<\/td>\n20<\/td>\n14.3<\/td>\n22<\/td>\n\u2014<\/td>\n7<\/td>\n<\/tr>\n
20 XL 037<\/td>\n20<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n32.34<\/td>\n31.83<\/td>\n38<\/td>\n24<\/td>\n14.3<\/td>\n22<\/td>\n\u2014<\/td>\n9<\/td>\n<\/tr>\n
21 XL 037<\/td>\n21<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n33.96<\/td>\n33.45<\/td>\n38<\/td>\n24<\/td>\n14.3<\/td>\n22<\/td>\n\u2014<\/td>\n9<\/td>\n<\/tr>\n
22 XL 037<\/td>\n22<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n35.57<\/td>\n35.07<\/td>\n41<\/td>\n25<\/td>\n14.3<\/td>\n22<\/td>\n\u2014<\/td>\n10<\/td>\n<\/tr>\n
24 XL 037<\/td>\n24<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n38.81<\/td>\n38.30<\/td>\n44<\/td>\n30<\/td>\n14.3<\/td>\n22<\/td>\n\u2014<\/td>\n12<\/td>\n<\/tr>\n
26 XL 037<\/td>\n26<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n42.04<\/td>\n41.53<\/td>\n48<\/td>\n30<\/td>\n14.3<\/td>\n22<\/td>\n8<\/td>\n11<\/td>\n<\/tr>\n
27 XL 037<\/td>\n27<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n43.66<\/td>\n43.15<\/td>\n48<\/td>\n34<\/td>\n14.3<\/td>\n22<\/td>\n8<\/td>\n11<\/td>\n<\/tr>\n
28 XL 037<\/td>\n28<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n45.28<\/td>\n44.77<\/td>\n51<\/td>\n34<\/td>\n14.3<\/td>\n22<\/td>\n8<\/td>\n16<\/td>\n<\/tr>\n
30 XL 037<\/td>\n30<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n48.51<\/td>\n48.00<\/td>\n54<\/td>\n38<\/td>\n14.3<\/td>\n22<\/td>\n8<\/td>\n18<\/td>\n<\/tr>\n
32 XL 037<\/td>\n32<\/td>\n6F<\/td>\nAL\/STEEL<\/td>\n51.74<\/td>\n51.24<\/td>\n57<\/td>\n38<\/td>\n14.3<\/td>\n25<\/td>\n8<\/td>\n20<\/td>\n<\/tr>\n
34 XL 037<\/td>\n34<\/td>\n6<\/td>\nAL\/STEEL<\/td>\n54.98<\/td>\n54.47<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n8<\/td>\n\u2014<\/td>\n<\/tr>\n
36 XL 037<\/td>\n36<\/td>\n6<\/td>\nAL\/STEEL<\/td>\n58.21<\/td>\n57.70<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n8<\/td>\n\u2014<\/td>\n<\/tr>\n
40 XL 037<\/td>\n40<\/td>\n6<\/td>\nAL\/STEEL<\/td>\n64.68<\/td>\n64.17<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n8<\/td>\n\u2014<\/td>\n<\/tr>\n
44 XL 037<\/td>\n44<\/td>\n6<\/td>\nAL\/STEEL<\/td>\n71.15<\/td>\n70.64<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n8<\/td>\n\u2014<\/td>\n<\/tr>\n
45 XL 037<\/td>\n45<\/td>\n6 \u0648\u0627\u0637<\/td>\nAL\/STEEL<\/td>\n72.77<\/td>\n72.26<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n10<\/td>\n\u2014<\/td>\n<\/tr>\n
48 XL 037<\/td>\n48<\/td>\n6 \u0648\u0627\u0637<\/td>\nAL\/STEEL<\/td>\n77.62<\/td>\n77.11<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n10<\/td>\n\u2014<\/td>\n<\/tr>\n
52 XL 037<\/td>\n52<\/td>\n6 \u0648\u0627\u0637<\/td>\nAL\/STEEL<\/td>\n84.08<\/td>\n83.58<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n10<\/td>\n\u2014<\/td>\n<\/tr>\n
56 XL 037<\/td>\n56<\/td>\n6 \u0648\u0627\u0637<\/td>\nAL\/STEEL<\/td>\n90.55<\/td>\n90.04<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n10<\/td>\n\u2014<\/td>\n<\/tr>\n
60 XL 037<\/td>\n60<\/td>\n6 \u0648\u0627\u0637<\/td>\nAL\/STEEL<\/td>\n97.02<\/td>\n96.51<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n10<\/td>\n\u2014<\/td>\n<\/tr>\n
68 XL 037<\/td>\n68<\/td>\n6 \u0648\u0627\u0637<\/td>\nAL\/STEEL<\/td>\n109.96<\/td>\n109.45<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n10<\/td>\n\u2014<\/td>\n<\/tr>\n
72 XL 037<\/td>\n72<\/td>\n6 \u0648\u0627\u0637<\/td>\nAL\/STEEL<\/td>\n116.42<\/td>\n115.92<\/td>\n\u2014<\/td>\n45<\/td>\n14.3<\/td>\n25<\/td>\n10<\/td>\n\u2014<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Note: Full 46-part range including all intermediate tooth counts (29, 38, 39, 41, 42, 43, 46, 47, 49, 57, 58, 59, 69, 70, 71) is available \u2014 contact us for the complete specification sheet. Bore diameter (d) to be specified at order; standard sizes from 6 mm to 25 mm depending on tooth count.<\/p>\n

\u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/a><\/p>\n

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2. About Our XL Series Straight Bore Timing Pulley<\/h2>\n

The EP-XL series is a precision-machined \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> manufactured to the XL pitch standard \u2014 a 5.08 mm (0.200 inch) tooth pitch that is one of the most widely used belt drive pitch specifications in industrial automation, CNC machinery, robotics, and precision instrumentation worldwide. Unlike taper-lock or QD-bushing pulley designs, the \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> accepts the drive shaft directly through the bore without an intermediate bushing, producing the most compact and dimensionally straightforward shaft-to-pulley assembly available in the timing pulley product family. The bore of each \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is machined to a finished dimension at manufacture, and a keyway is typically provided for positive torque transmission through a standard parallel key.<\/p>\n

Available in both aluminum (AL) and steel (STEEL) materials across the tooth count range from 10 teeth through 72 teeth, the XL 037 series covers pitch diameters from 16.17 mm (10 teeth) up to 116.42 mm (72 teeth). Three structural types are offered \u2014 Type 6F (flanged, for tooth counts 10 through 32), Type 6 (plain, for tooth counts 34 through 44), and Type 6W (wide flanged for tooth counts 45 through 72) \u2014 reflecting the standard relationship between tooth count, pulley body width requirement, and the belt-retention flange configuration that prevents lateral belt tracking errors in service. The F dimension (face width of 14.3 mm across the full range) is uniform, simplifying belt selection across different tooth count configurations within the same XL pitch drive system. Understanding the correct timing belt pulley type<\/strong> for each application \u2014 flanged, plain, or wide-web \u2014 is essential when specifying a \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> for a new or replacement drive.<\/p>\n

The XL series aluminum timing pulley<\/strong> variant is the standard choice for the majority of light-to-medium industrial drive applications where weight minimization, corrosion resistance, and ease of machining post-purchase are valued over the higher torque capacity of the steel alternative. The aluminum construction of this \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> significantly reduces rotational inertia compared to a steel pulley of the same tooth count \u2014 a practically important characteristic in servo-driven systems where the total reflected inertia determines servo motor sizing and dynamic response bandwidth. The steel variant is specified where higher torque density, exposure to abrasive environments, or resistance to shaft key fretting damage at the bore-shaft interface is required.<\/p>\n<\/div>\n

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3. \u062e\u0645\u0633 \u0645\u0632\u0627\u064a\u0627 \u0631\u0626\u064a\u0633\u064a\u0629 \u0644\u0644\u0645\u0646\u062a\u062c<\/h2>\n
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\u25b6 Zero-Backlash Synchronous Drive Geometry<\/div>\n

The XL tooth profile is an involute-derived trapezoidal form standardized across ANSI\/RMA IP-24 and ISO 5294, ensuring that an XL pitch belt meshes correctly with any XL pitch pulley regardless of manufacturer origin. This dimensional interchangeability is critical for maintenance-driven procurement: replacement XL pulleys must mesh precisely with the existing belt to preserve the synchronous (zero-slip) nature of the drive. The \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> tooth profile is cut to the XL standard tooth geometry \u2014 tooth height, tooth root radius, and tooth flank angle \u2014 on CNC hobbing or forming machines, and verified dimensionally before dispatch. This precision tooth form eliminates the belt-tooth clearance variation that causes timing error in position-critical servo and stepper motor drive systems where a \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is the preferred interface between motor shaft and belt.<\/p>\n<\/div>\n

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\u25b6 Aluminum Construction for Low Inertia and Corrosion Resistance<\/div>\n

The aluminum timing pulley<\/strong> variant of the XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> uses 6061-T6 or equivalent structural aluminum alloy, providing tensile strength in the 260\u2013310 MPa range that is adequate for the belt tension loads in standard XL pitch drive systems. The aluminum’s density of approximately 2.7 g\/cm\u00b3 \u2014 roughly one-third of steel \u2014 produces a \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> that is substantially lighter for any given tooth count and diameter. At 40 teeth with a pitch diameter of 64.68 mm, the aluminum straight bore timing pulley weighs approximately one-third of its steel equivalent, reducing shaft bearing loads and motor inertia contribution. The natural oxide layer that forms on aluminum surfaces provides adequate corrosion protection for indoor industrial environments; for outdoor or chemical exposure applications, the steel variant or an anodized aluminum straight bore timing pulley option is recommended.<\/p>\n<\/div>\n

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\u25b6 Comprehensive Tooth Count Range \u2014 10 to 72 Teeth<\/div>\n

The XL 037 \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> series covers 46 distinct part numbers from 10 XL 037 (10 teeth, Dp 16.17 mm) through 72 XL 037 (72 teeth, Dp 116.42 mm), providing a continuous range of drive ratios from a single catalogued product family. This comprehensive range means that a drive designer can achieve any required speed ratio from approximately 1:7.2 (10-tooth driver, 72-tooth driven) to 7.2:1 within a single pitch and face width standard, without combining pulleys from different series or pitch families. The wide range also accommodates center distance optimization: selecting tooth counts that produce the required ratio while keeping the belt wrap angle at both straight bore timing pulley positions above the 90-degree minimum recommended for synchronous belt drive reliability.<\/p>\n<\/div>\n

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\u25b6 Three Structural Types for Belt Retention Optimization<\/div>\n

The three type designations in the XL 037 series \u2014 6F (double flange, small tooth counts), 6 (plain, mid-range), and 6W (wide web, large tooth counts) \u2014 provide the correct belt retention geometry across the tooth count range for each \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> configuration. Flanged straight bore timing pulley units (Type 6F) provide physical lateral containment for the belt, preventing the belt from tracking off the pulley under misalignment or side-load conditions \u2014 critical for small tooth-count (small diameter) pulleys where the belt’s tendency to track off is highest. The plain Type 6 and wide Type 6W configurations for larger diameters rely on the belt’s natural lateral stiffness and the drive geometry for tracking, eliminating flange-induced belt edge wear that can occur on large-diameter flanged straight bore timing pulley units. This engineered progression through structural types across the tooth count range reflects the \u0628\u0643\u0631\u0629 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> design standards compiled from decades of industrial drive experience.<\/p>\n<\/div>\n

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\u25b6 Standard Bore with Keyway for Positive Torque Transmission<\/div>\n

The \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is bored to a finished standard diameter with a parallel keyway \u2014 the most mechanically straightforward shaft-to-pulley connection in industrial drive systems. The bore diameter of each \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is typically specified to an H7 tolerance, accepting a standard keyed shaft in a close running or light press fit depending on the drive torque and reversing load requirements. For the majority of XL pitch drive applications \u2014 light to medium conveyor drives, CNC axis drives, and indexing mechanisms \u2014 the keyway provides adequate torque transmission capacity without the additional mechanical complexity of taper-lock or keyless shrink disc retention systems. The bored-and-keyed connection of this \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> also allows the pulley to be repositioned axially on the shaft for belt alignment adjustment, a practical advantage in field installation and maintenance.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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4. How the XL Timing Belt and Straight Bore Timing Pulley Drive Works<\/h2>\n

The \u0628\u0643\u0631\u0629 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> and belt system transmits rotary motion between shafts through positive mechanical engagement between the belt teeth and the pulley tooth spaces, rather than through friction as V-belt or flat belt systems do. The XL pitch specifies the exact dimensional relationship between belt teeth and straight bore timing pulley tooth spaces: the 5.08 mm pitch (center-to-center distance between adjacent belt teeth) must equal the pitch circle spacing of the straight bore timing pulley teeth, which is the pitch diameter divided by the tooth count times pi. At any instant, multiple teeth are simultaneously in engagement \u2014 the number in engagement depends on the belt wrap angle around the straight bore timing pulley and the tooth pitch \u2014 distributing the transmitted load across these teeth and providing the redundancy that makes synchronous belt drives more reliable than single-tooth engagement mechanisms.<\/p>\n

The term “synchronous” in timing belts and pulleys refers to the fact that the angular velocity ratio between input and output shafts is exactly determined by the straight bore timing pulley tooth count ratio, with no slip. A 20-tooth driving straight bore timing pulley turning at 1500 rpm drives a 40-tooth driven straight bore timing pulley at exactly 750 rpm regardless of load, within the elastic deformation limits of the belt under tension. This synchronous behavior is what distinguishes timing belt drives from V-belt drives (which slip under overload and exhibit speed variation under load fluctuation) and makes them indispensable in applications where shaft position accuracy or constant velocity ratio matters \u2014 CNC machine tool axes, printing press registration drives, indexing conveyors, and robotic joint drives.<\/p>\n

The XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is the smaller-pitch alternative to XH, H, and L pitch pulleys, producing a finer tooth pitch that suits lower power, higher-speed, precision drives. At 5.08 mm pitch, the XL series handles drive powers from approximately 0.1 kW at high speeds through approximately 2\u20133 kW at lower speeds for standard belt widths, making it appropriate for servo axis drives, stepper motor-driven positioning systems, small conveyor indexing drives, and precision instrument mechanisms. The \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> in the XL series is the direct interface between the motor or drive shaft and the belt, and its dimensional accuracy \u2014 tooth profile, pitch accuracy, bore concentricity, and face runout \u2014 directly determines the transmission accuracy, belt life, and noise level of the complete \u0628\u0643\u0631\u0629 \u0645\u062d\u0631\u0643 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> system.<\/p>\n<\/div>\n

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5. Straight Bore Timing Pulley Selection and Procurement Guide<\/h2>\n

Selecting the correct \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> for an XL pitch drive requires confirming four parameters before ordering: tooth count, material, bore diameter, and structural type (6F, 6, or 6W). The tooth count determines the pitch diameter and therefore the drive ratio \u2014 the ratio of driven to driving straight bore timing pulley tooth counts equals the inverse of the speed ratio. For example, a drive requiring a 2:1 speed reduction pairs a 20-tooth driving straight bore timing pulley with a 40-tooth driven straight bore timing pulley. The pitch diameter difference between these two pulleys determines the minimum center distance for adequate belt wrap angle.<\/p>\n

Material selection between the aluminum timing pulley<\/strong> and steel options for a given straight bore timing pulley depends on the drive’s torque level, cycling duty, and environmental exposure. The aluminum straight bore timing pulley is suitable for the majority of servo and stepper motor positioning drives up to the rated torque of standard XL belts; the steel straight bore timing pulley becomes the correct choice when bore fretting damage at the keyway interface is observed under heavy reversing load or when the environment includes abrasive particles that would accelerate surface wear on the softer aluminum. Many designs use a steel straight bore timing pulley on the motor shaft (where keyway reversing loads are highest) and an aluminum straight bore timing pulley on the driven shaft (where lower inertia is the priority).<\/p>\n

Bore diameter specification is the most frequently mishandled parameter in straight bore timing pulley procurement. The bore must exactly match the shaft diameter \u2014 an oversized bore allows lateral runout that causes belt-tracking errors, while an undersized bore requires force fitting that can crack the straight bore timing pulley hub. Always specify the bore diameter to H7 tolerance unless the application specifically requires a tighter fit. For intermediate bore sizes not listed in the standard range, our engineering team can machine custom bore diameters in any straight bore timing pulley size within the XL 037 series at production lead times that suit most standard procurement timelines.<\/p>\n<\/div>\n

\"china-timing-pulley-products-EP-XL<\/p>\n

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6. Materials: Aluminum and Steel Straight Bore Timing Pulley Options<\/h2>\n

The XL 037 \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is available in two material variants that cover the complete range of performance requirements encountered in the XL pitch drive application spectrum. The aluminum variant uses 6061-T6 aluminum alloy as the standard specification \u2014 a heat-treatable structural alloy containing silicon, magnesium, and trace manganese that achieves 0.2% proof strength of approximately 275 MPa and ultimate tensile strength of approximately 310 MPa in the T6 temper condition. This strength level is adequate for XL pitch belt drives operating at standard belt tensions, and the alloy’s excellent machinability allows tight dimensional tolerances to be held during CNC turning and milling of the tooth form and bore without the tool wear and dimensional drift that harder materials produce. The aluminium timing pulley<\/strong> surface can be left as-machined, chemically treated (chromate conversion), or hard anodized for additional surface hardness and corrosion resistance in applications where bare aluminum would be insufficient for this type of \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong>.<\/p>\n

The steel variant of this \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> uses medium-carbon or medium-carbon alloy steel (typically 45C or 40Cr equivalent) that provides approximately 2\u20133 times the tensile strength of the aluminum alternative and significantly higher surface hardness at the bore-keyway interface, where fretting wear from cyclic torque transmission can cause progressive hub enlargement over time in aluminum pulleys under heavy cycling. Steel is the correct choice for \u0628\u0643\u0631\u0629 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> applications involving high torque-to-diameter ratios, significant reversing loads, or vibration that would cause fretting at the shaft-bore interface of the straight bore timing pulley. The steel surface requires corrosion protection \u2014 either black oxide treatment for indoor service or zinc plating for more aggressive environments \u2014 since steel’s corrosion resistance is substantially lower than aluminum’s in the presence of moisture.<\/p>\n

The face width F = 14.3 mm is consistent across the entire tooth count range in the XL 037 \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> series, which means that the same XL standard belt (6.4 mm nominal width for XL 037 designation) tracks correctly across all tooth counts without requiring different belt widths for different straight bore timing pulley sizes in the same drive system. This dimensional uniformity is a significant procurement advantage for machine builders who use multiple XL pitch pulley tooth counts in the same machine: a single belt width sourcing relationship covers all straight bore timing pulley positions in the design.<\/p>\n<\/div>\n

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7. \u0633\u064a\u0646\u0627\u0631\u064a\u0648\u0647\u0627\u062a \u0627\u0644\u062a\u0637\u0628\u064a\u0642<\/h2>\n

The XL pitch \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> serves precision motion and synchronous drive requirements across a broad range of industries globally. The 5.08 mm pitch provides the ideal balance between belt tooth strength and drive compactness for light-to-medium power applications where timing accuracy and belt life are the primary design criteria.<\/p>\n

\n
\n
CNC Machine Tool Axis Drives<\/div>\n

CNC milling machines, lathes, laser cutters, and plasma cutting systems use \u0628\u0643\u0631\u0629 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> and belt drives to transfer motor torque from the servo or stepper motor to the lead screw or rack-and-pinion drive axis. The XL pitch provides sufficient tooth engagement strength for the belt tensions generated in these applications, and the synchronous nature of the drive ensures that the controller’s commanded motor position accurately corresponds to the axis physical position \u2014 a fundamental requirement for CNC positioning accuracy. The \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is the standard interface in these drives precisely because its compact, bushingless design suits the tight packaging of servo axis drive packages. The timing belt idler pulley is often incorporated in these circuits to maintain belt tension as the axis approaches the center distance change caused by thermal expansion of the machine structure.<\/p>\n<\/div>\n

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Industrial Robotics and Collaborative Robots<\/div>\n

Industrial robot joints, collaborative robot (cobot) arm links, and SCARA robot axes use lightweight aluminum timing pulley<\/strong> belt stages to achieve speed reduction between the servo motor and the structural joint without the backlash and weight penalty of gear trains. The XL series \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is widely used in belt-reduction stages within robot arm links where envelope constraints require compact, flat drive packages, and where the low weight of the straight bore timing pulley contributes to minimizing the arm’s self-weight \u2014 a primary design objective in collaborative robots that must carry themselves plus the rated payload within the joint torque budget.<\/p>\n<\/div>\n

\n
Printing and Packaging Machinery<\/div>\n

Sheet-fed and web-fed printing machines, packaging line conveyors, and labeling systems require constant velocity ratio drives with zero slip to maintain print registration accuracy and product placement precision as line speeds increase. The synchronous \u0628\u0643\u0631\u0629 \u0645\u062d\u0631\u0643 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> is the standard solution for these applications, and the XL pitch \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is appropriate for the moderate power and high-speed operating conditions of medium-format printing and packaging equipment. The timing pulley standard sizes of the XL 037 series align with the belt and straight bore timing pulley specifications that major European and North American printing machinery OEMs have standardized into their machine platforms over decades of production.<\/p>\n<\/div>\n

\n
Medical and Laboratory Equipment<\/div>\n

Medical imaging equipment (CT scanners, MRI positioning tables, X-ray positioning systems), laboratory automation (liquid handling robots, microplate movers, centrifuge control mechanisms), and diagnostic instrument drives use XL pitch \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> units in precision motion stages where repeatability and low noise are equally important. The aluminum straight bore timing pulley in this application offers the additional advantage of being MRI-compatible in environments where ferromagnetic materials produce hazardous projectile risks. Custom bore sizes to fit the small diameter motor shafts common in medical drive systems are available, and the straight bore timing pulley profile meets the dimensional precision requirements for medical equipment motion control standards including IEC 60601 applicable drive components.<\/p>\n<\/div>\n

\n
3D Printers and Additive Manufacturing Equipment<\/div>\n

Desktop and industrial 3D printers \u2014 FDM, SLA, SLS, and material jetting types \u2014 use XL pitch or smaller pitch \u0628\u0643\u0631\u0629 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> systems for their print head positioning axes (typically X and Y), with the aluminum \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> contributing to the low moving mass that is essential for high acceleration at the print head without exceeding the stepper motor’s torque budget. The XL pitch 5.08 mm tooth spacing is the most common tooth pitch in the desktop 3D printer and professional additive manufacturing equipment market, and the \u0627\u0633\u062a\u0628\u062f\u0627\u0644 \u0628\u0643\u0631\u0629 \u0633\u064a\u0631 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> market for these machines is substantial globally, driven by wear, accidental damage, and performance upgrade activities across the large installed base of both hobbyist and professional additive manufacturing systems.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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8. Standards Compliance and Regulatory Framework<\/h2>\n

The XL pitch \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> and the timing belt systems in which it operates are governed by dimensional standards that ensure interchangeability and performance predictability across different manufacturers and geographic markets. Understanding the applicable standards framework helps engineers and procurement teams verify dimensional compliance and select compatible products across different supply sources.<\/p>\n

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ANSI\/RMA IP-24 \u2014 USA \/ Global<\/div>\n

The American National Standard ANSI\/RMA IP-24 defines the tooth form, pitch, and dimensional tolerances for synchronous belt drives in the MXL, XL, L, H, XH, and XXH pitch families. The XL pitch (5.08 mm) is fully specified in this standard, including straight bore timing pulley tooth form dimensions, pitch circle diameter calculation formulas, and belt width designations. This standard is the reference for China timing pulley manufacturers who supply global markets and need to verify compatibility with belts sourced to ANSI standards. The standard is maintained by the Rubber Manufacturers Association and is the primary reference for North American market synchronous drive design using the \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> and related components.<\/p>\n<\/div>\n

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ISO 5294 and ISO 5296 \u2014 International<\/div>\n

ISO 5294 (Synchronous Belt Drives \u2014 Pulleys) and ISO 5296 (Synchronous Belt Drives \u2014 Belts: Dimensional Requirements) provide the international equivalent of the ANSI standards for synchronous belt drive components. These standards cover the same pitch families including XL pitch and specify the dimensional requirements that a \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> must meet for interchangeability across ISO-compliant products. European, Japanese, Korean, and Australian market machine builders reference ISO 5294 in their component specifications, and timing pulley manufacturers supplying these markets must demonstrate compliance with ISO 5294 dimensional requirements for the \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong>.<\/p>\n<\/div>\n

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EU Machinery Directive 2006\/42\/EC<\/div>\n

Drive components including \u0628\u0643\u0631\u0629 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> sets installed in machinery sold in the European Union must be designed and selected to meet the essential health and safety requirements of the Machinery Directive. Timing belt drives incorporating a \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> in safety-relevant positions \u2014 such as robotic joint drives, medical positioning systems, and automated machinery \u2014 must be specified with adequate design safety factors and the belt life calculations must account for the machinery’s designed service life. Buyers incorporating XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> units into CE-marked machinery should obtain dimensional compliance documentation and material certificates as part of the technical file.<\/p>\n<\/div>\n

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JIS B 1856 \u2014 Japan<\/div>\n

The Japanese Industrial Standard JIS B 1856 governs synchronous belt drive pulleys for the Japanese market. The XL pitch dimensions in JIS B 1856 are dimensionally equivalent to ANSI\/RMA IP-24 and ISO 5294 for the XL series, allowing Japanese-standard machines to use XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> units sourced internationally without dimensional conflict. Japanese automation and machine tool manufacturers \u2014 among the world’s most demanding users of metric timing pulleys and synchronous drive components \u2014 specify straight bore timing pulley dimensional accuracy to JIS tolerances that are equivalent to or more stringent than ISO 5294.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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9. Compatible Products for Complete Drive Systems<\/h2>\n

A complete synchronous timing belt drive system requires matched \u0628\u0643\u0631\u0629 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong> components including the \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong>, and often includes complementary products for tension adjustment, shaft-to-pulley connection, and system speed ratio optimization. We supply matched products across the complete timing drive component range.<\/p>\n

\n
\n
\u0642\u0636\u0628\u0627\u0646 \u0645\u0633\u0646\u0646\u0629 \u0642\u064a\u0627\u0633\u064a\u0629 \u0630\u0627\u062a \u062e\u0637\u0648\u0629 \u0645\u062a\u0631\u064a\u0629<\/div>\n

Metric Pitch Standard Toothed Bars provide the linear rack equivalent of the rotary \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> for linear positioning applications. When a timing belt wraps around a \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> and meshes with a toothed rack, the rotational motion of the straight bore timing pulley produces precise linear translation of the belt and carriage system \u2014 the operating principle used in many CNC gantry systems, 3D printer bed drives, and linear conveyor indexing mechanisms. Our toothed bar range covers the same pitch standards as the XL straight bore timing pulley series, ensuring dimensional compatibility for system designs that combine rotary pulley and linear rack components within the same drive architecture.<\/p>\n

\"Metric<\/div>\n<\/div>\n
\n
\u0628\u0643\u0631\u0627\u062a \u0633\u064a\u0631 \u0639\u0644\u0649 \u0634\u0643\u0644 \u062d\u0631\u0641 V<\/div>\n

In multi-stage drive systems where timing belt synchronization handles the precision positioning requirement and a \u0628\u0643\u0631\u0629 \u062d\u0632\u0627\u0645 \u0639\u0644\u0649 \u0634\u0643\u0644 \u062d\u0631\u0641 V<\/a> drive handles the primary power transmission from a higher-power motor to the timing belt stage input, both pulley types must be selected for mechanical compatibility at the shared shaft. Our V-belt pulley range covers all standard groove profiles \u2014 SPA, SPB, SPC, A, B, C, D sections \u2014 in cast iron, steel, and aluminum, providing the primary power stage counterpart to the XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> precision stage in multi-stage machine drives where cost and efficiency balance determines the split between V-belt and synchronous belt stages using the \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong>.<\/p>\n

\"V-belt<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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10. \u0646\u0628\u0630\u0629 \u0639\u0646\u0627<\/h2>\n

We are a specialized timing pulley manufacturer with production capability across the complete range of synchronous belt drive pulleys \u2014 including the XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong>, L, H, XH, XXH, MXL, T2.5, T5, T10, AT5, AT10, HTD 3M, HTD 5M, HTD 8M, and custom pitch configurations. Our production facility is equipped with CNC turning centers, CNC milling machines, CNC gear hobbing equipment, and precision measurement systems that verify tooth profile accuracy, pitch circle runout, and bore concentricity to the dimensional tolerances specified in ANSI\/RMA IP-24 and ISO 5294 for each \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> unit. We manufacture both catalogued timing pulley stock items for immediate shipment and custom \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> units to buyer-specified bore diameters, hub lengths, materials, and surface treatments.<\/p>\n

\u0648\u0631\u0634\u0629 \u0639\u0645\u0644<\/h3>\n
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\"Straight
\n\"Straight
\n\"Timing
\n\"Timing<\/div>\n<\/div>\n<\/div>\n
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\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/h2>\n
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\nQ1. What is a straight bore timing pulley and how does it differ from a taper bore or QD bushing timing pulley for CNC machine applications?<\/summary>\n
A \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> has its bore machined to a finished cylindrical diameter with a parallel keyway, allowing the shaft to be inserted directly without an intermediate bushing. The straight bore timing pulley differs from a taper bore pulley (which uses a self-locking taper between pulley and bushing for tool-free removal) and a QD bushing pulley (which uses a split tapered bushing for easy installation and removal). For CNC machine applications, the \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> offers the most compact assembly \u2014 no bushing occupies space between shaft and pulley hub \u2014 which is important in the small-clearance installations typical of servo axis drive packages. The trade-off is that straight bore timing pulleys are harder to remove without pullers if the keyway fit has been damaged, while taper and QD bushing systems release easily without special tools.<\/div>\n<\/details>\n<\/div>\n
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\nQ2. What is the difference between XL and HTD timing belt pulley tooth profiles, and which should I use for a high-torque industrial robotics application?<\/summary>\n
XL pitch uses a trapezoidal tooth profile standardized in ANSI\/RMA IP-24, which has been the workhorse of precision synchronous drives for decades and is optimally suited for positioning applications where belt-tooth mesh accuracy is the primary requirement. The \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> in XL pitch is widely available globally in standard sizes. HTD (High Torque Drive) pulleys use a curvilinear (semicircular arc) tooth profile that provides substantially higher torque capacity per unit belt width compared to trapezoidal profiles, because the curved tooth distributes load more evenly across the tooth face and eliminates the stress concentrations at the trapezoidal tooth root corners. For high-torque industrial robotics applications where torque density in a compact belt width is the critical parameter, HTD 5M or HTD 8M pitch pulleys are typically the better choice. XL straight bore timing pulley is preferred when positioning accuracy and the large global availability of matching belts are the primary considerations.<\/div>\n<\/details>\n<\/div>\n
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\nQ3. Where can I get a supplier quote for custom timing belt pulleys with a non-standard bore diameter for a medical imaging equipment drive in the European market?<\/summary>\n
For custom \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> units with non-standard bore diameters for medical imaging equipment in Europe, submit an inquiry with the required tooth count, pitch (XL, L, or metric), face width, outside diameter, bore diameter and tolerance, keyway specification (width and depth), hub length, and material requirement. We manufacture custom bore configurations within our standard tooth count range and can provide dimensional drawings for approval before production. For medical equipment applications, we can provide material certificates and dimensional inspection reports as part of the straight bore timing pulley order documentation. European delivery is arranged through standard freight services. Quotation response time is typically within 2\u20133 business days for custom bore configurations.<\/div>\n<\/details>\n<\/div>\n
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\nQ4. How do I select the correct XL timing pulley tooth count for a specific drive ratio in a servo-driven conveyor indexing system?<\/summary>\n
To select the correct tooth counts for a specific drive ratio in an XL pitch conveyor indexing system: divide the required driven shaft speed by the motor shaft speed to determine the speed ratio. The straight bore timing pulley tooth count ratio equals the speed ratio \u2014 for example, a 3:1 ratio requires a driven straight bore timing pulley with 3 times as many teeth as the driving pulley. Next, verify that the selected tooth counts produce a belt wrap angle above 90 degrees at both straight bore timing pulley positions for the chosen center distance. For an indexing application specifically, prefer even tooth count ratios where possible to synchronize the belt’s tooth-to-pulley relationship, and verify that the minimum tooth count (driving pulley) exceeds 12 teeth to avoid the resonance and load concentration that occurs at very low tooth counts in synchronous drives.<\/div>\n<\/details>\n<\/div>\n
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\nQ5. What is the correct timing belt pulley replacement procedure for an XL straight bore pulley on a 3D printer axis, and how do I maintain positioning accuracy after replacement?<\/summary>\n
To replace an XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> on a 3D printer axis: first release belt tension by loosening the idler or motor mount bolts. Slide the belt off the straight bore timing pulley. Remove the grub screw (set screw) from the pulley hub, then slide the straight bore timing pulley off the motor shaft. Install the new straight bore timing pulley at the same axial position as the original \u2014 measure from the motor face to the pulley face before removal and replicate this dimension on installation. Tighten the grub screw against the flat on the motor shaft (if present) or the keyway. Reinstall the belt, tension to the manufacturer’s recommended deflection value, and verify both straight bore timing pulley units are co-planar (aligned in the same plane). After replacement, run a dimensional accuracy calibration sequence to verify that the new straight bore timing pulley pitch diameter matches the controller’s motion parameters.<\/div>\n<\/details>\n<\/div>\n
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\nQ6. Which is better for a high-speed CNC laser cutter axis drive \u2014 aluminum timing pulley or steel timing pulley, and what are the trade-offs?<\/summary>\n
For a high-speed CNC laser cutter axis drive, the aluminum timing pulley<\/strong> variant of the \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> is typically the better choice for the moving axis (the carriage-side pulley) because its lower mass reduces the inertia that the servo motor must accelerate and decelerate during the rapid direction changes of laser cutting patterns. Lower moving mass directly reduces the peak torque required from the servo motor, allowing a smaller motor or achieving higher acceleration rates with the same motor. The steel straight bore timing pulley is preferred for the fixed motor-side pulley where its additional weight has no negative effect on dynamics, but its higher bore hardness provides better resistance to fretting wear at the keyway-shaft interface under the reversing load that the laser cutter’s direction changes impose. Many laser cutter designs use an aluminum straight bore timing pulley for the moving axis and a steel straight bore timing pulley for the motor-mounted position as the optimal combination.<\/div>\n<\/details>\n<\/div>\n
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\nQ7. What are the metric timing belt pulley pitch options available beyond XL, and when would a design engineer choose T5 or AT5 pitch over XL for an industrial automation system in Germany?<\/summary>\n
Metric timing pulleys available beyond XL pitch include the T-series (T2.5 at 2.5 mm pitch, T5 at 5 mm pitch, T10 at 10 mm pitch) and the AT-series (AT3, AT5, AT10) with modified tooth profiles for higher resistance to ratcheting under shock loads. T5 pitch (5 mm) is dimensionally close to XL pitch (5.08 mm) but uses a metric tooth spacing that does not interchange with XL belts or an XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong>. German automation designers often prefer the AT5 pitch over XL for applications with shock loading \u2014 conveyor indexers with abrupt starts, robotic pick-and-place with payload impact \u2014 because the AT profile’s wider tooth roots provide better resistance to the belt ratcheting (tooth jumping) that XL’s trapezoidal profile is more susceptible to under transient overload. XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> remains preferred when ANSI-standardized belt availability or compatibility with North American machine designs is required.<\/div>\n<\/details>\n<\/div>\n
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\nQ8. How does the timing belt idler pulley work in an XL drive system, and when is it necessary to include one in a straight bore timing pulley drive design?<\/summary>\n
A timing belt idler pulley is an additional plain or toothed pulley that contacts the belt on the outside (plain idler) or inside (toothed idler) of the belt span to increase belt wrap angle around the driving \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong>, maintain tension as center distance changes, or route the belt around an obstacle within the machine. It is necessary in an XL drive system when: the wrap angle at the small-tooth-count driving straight bore timing pulley falls below 90 degrees due to a high speed ratio and constrained center distance; the center distance must be fixed but belt stretch over time would cause insufficient tension; or the belt must deviate from a straight line between two straight bore timing pulley positions to accommodate machine structure. The idler pulley adds load to the belt and reduces belt life compared to a plain two-pulley drive, so it should be specified only when the drive geometry requires it.<\/div>\n<\/details>\n<\/div>\n
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\nQ9. How do I verify that an XL straight bore timing pulley from a new supplier is dimensionally compatible with my existing XL timing belt before installing it in a production machine?<\/summary>\n
To verify dimensional compatibility of a new XL \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> with an existing XL belt before installation in a production machine: first confirm the pitch from the part number (XL = 5.08 mm) \u2014 the belt and straight bore timing pulley pitch must match exactly. Measure the straight bore timing pulley outside diameter with a caliper and verify it matches the De value in the specification table for the tooth count of the new straight bore timing pulley. Install the belt on the straight bore timing pulley by hand without tension and verify that the belt teeth seat fully into the pulley tooth spaces without forcing \u2014 correct XL mesh produces a snug, zero-clearance seat. If the belt sits proud of the tooth spaces or requires force to engage, the tooth form of the straight bore timing pulley is incorrect. Measure the pulley face width and verify it accommodates the belt width without the belt overhanging the edges. If all three checks pass, the dimensional compatibility is confirmed for production installation.<\/div>\n<\/details>\n<\/div>\n
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\nQ10. What are the typical timing belt pulley types available in the XL series and how does the flange number designation help identify the correct replacement pulley?<\/summary>\n
The XL 037 \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> series uses three structural timing belt pulley type<\/strong> designations \u2014 6F (flanged both sides, tooth counts 10\u201332), 6 (plain, no flanges, tooth counts 34\u201344), and 6W (web-type with wider hub, tooth counts 45\u201372) \u2014 and the Flange Number in the dimensional table identifies the specific flange kit that fits each straight bore timing pulley size, which can be separately ordered and fitted if the flanges are missing from or damaged on an existing pulley. To identify the correct replacement \u0628\u0643\u0631\u0629 \u062d\u0632\u0627\u0645 \u0627\u0644\u062a\u0648\u0642\u064a\u062a<\/strong>: read the part code stamped on the existing straight bore timing pulley (e.g., “20 XL 037”) \u2014 the first number is tooth count, XL is pitch, and 037 is the face width designation. Cross-reference the part code against the dimensional table to confirm Dp, De, Df, F, and L match your installation requirements. If the bore diameter does not appear in the standard range, a custom bore can be specified at order for any \u0628\u0643\u0631\u0629 \u062a\u0648\u0642\u064a\u062a \u0630\u0627\u062a \u062a\u062c\u0648\u064a\u0641 \u0645\u0633\u062a\u0642\u064a\u0645<\/strong> in the XL series.<\/div>\n<\/details>\n<\/div>\n<\/div>\n<\/div>\n

\u0627\u0644\u0645\u062d\u0631\u0631: PXY<\/p>","protected":false},"excerpt":{"rendered":"

The EP-XL 5.08mm Aluminum Straight Bore Timing Pulley are precision-engineered for synchronous drive systems requiring a 5.08mm pitch. Available in tooth counts ranging from 10 to 72, these pulleys offer versatile speed ratio options for diverse industrial applications. Constructed from high-quality aluminum or steel, they ensure durability and lightweight performance.
\nKey dimensions include a consistent flange width (F) of 14.3mm. Models with 10-22 teeth feature a 20-22mm length (L), while larger models (26-72 teeth) extend to 25mm. The series accommodates various bore sizes (Dm), starting from 9.5mm for smaller pulleys up to 100mm for the largest 68-72 tooth variants. With precise outer diameters (De) spanning from 15.66mm to 115.92mm, these pulleys provide accurate transmission for automation, robotics, and machinery.<\/p>","protected":false},"featured_media":3497,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[1051],"product_tag":[],"class_list":["post-3493","product","type-product","status-publish","has-post-thumbnail","product_cat-straight-bore-timing-pulley-mxl-xl-l-h","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/china-timing-pulley.xyz\/ar\/wp-json\/wp\/v2\/product\/3493","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/china-timing-pulley.xyz\/ar\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/china-timing-pulley.xyz\/ar\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/china-timing-pulley.xyz\/ar\/wp-json\/wp\/v2\/comments?post=3493"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/china-timing-pulley.xyz\/ar\/wp-json\/wp\/v2\/media\/3497"}],"wp:attachment":[{"href":"https:\/\/china-timing-pulley.xyz\/ar\/wp-json\/wp\/v2\/media?parent=3493"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/china-timing-pulley.xyz\/ar\/wp-json\/wp\/v2\/product_brand?post=3493"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/china-timing-pulley.xyz\/ar\/wp-json\/wp\/v2\/product_cat?post=3493"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/china-timing-pulley.xyz\/ar\/wp-json\/wp\/v2\/product_tag?post=3493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}