EP-L75 9.525மிமீ நேரான துளை கொண்ட டைமிங் புல்லி - எஃகு மற்றும் வார்ப்பிரும்பு

L SERIES CHINA TIMING BELT PULLEY

EP-L075 9.525mm Pitch Straight Bore Timing Pulley — Steel and Cast Iron

Part Codes: 10L075 – 120L075 | Teeth: 10 – 120 | Pitch: 9.525 mm (L Series) | Types: 6F / 6WF / 6W / 6A | Material: Steel / Cast Iron

The EP-L075 series is a comprehensive range of straight bore timing pulleys manufactured to the standard L series pitch of 9.525 mm. Available in steel (10 to 48 teeth) and cast iron (49 to 120 teeth), this L075 series covers the pitch diameters from 30.32 mm to 363.83 mm required for precision synchronous belt drive systems in global industrial automation, conveyor, printing, medical, and packaging machinery applications.

2. About Our L075 Straight Bore Timing Pulley

The EP-L075 is a precision-machined synchronous belt drive component manufactured to the ANSI L series standard, which defines a 9.525 mm (3/8 inch) circular pitch, a 40° included tooth angle, and specific flange and hub geometry for each tooth count. The L series occupies the medium-duty segment of the standard inch-pitch timing belt pulley family — above the XL series (5.08 mm pitch) used in light-duty office automation and instrumentation, and below the H series (12.7 mm pitch) used for heavier industrial drives. This positioning makes the L series straight bore timing pulley the most versatile choice for medium-torque synchronous drives in packaging machinery, conveyor systems, printing presses, CNC machine tool auxiliary drives, and general industrial automation equipment used across North America, Europe, Southeast Asia, and global export markets.

The "straight bore" designation distinguishes this pulley from taper lock bore, QD bushing bore, and split bore variants. In a straight bore timing pulley, the bore is machined concentrically through the hub to a standard diameter that accepts a round shaft directly. The shaft is secured by a set screw against a flat machined on the shaft or by a keyway-and-key arrangement. This configuration is the simplest and lowest-cost pulley mounting method, appropriate for drives where shaft access is available at assembly, where concentricity requirements are met by the manufacturing tolerances of the straight bore and the shaft, and where frequent disassembly is not a regular service requirement. For drives requiring frequent pulley removal, taper lock bore variants of the L series are available from the same product range, offering superior concentricity and quick removal without shaft scoring.

The L075 suffix specifies both the pitch (L) and the belt width (075, meaning 0.75 inches or approximately 19.05 mm). The belt width code is important because timing pulleys in the L series carry flanges sized to retain belts of the specified width, and the flange-to-flange dimension (F dimension, 25.4 mm across the entire L075 range) is machined to match the standard 19.05 mm wide L series timing belt with appropriate side clearance. This matched specification means that when an L075 straight bore timing pulley is paired with a standard 0.75-inch-wide L series timing belt, the belt runs correctly within the flanges without edge contact that would cause premature belt wear or noise.

3. Five Key Advantages of the EP-L075 Straight Bore Timing Pulley

4. Working Principle of the L Series Straight Bore Timing Pulley

The L series straight bore timing pulley operates as the driving or driven element in a synchronous belt drive system. Unlike V-belt drives, which transmit torque through friction between the belt and pulley groove, synchronous belt drives use meshing engagement between the trapezoidal teeth on the inside of the timing belt and the matching tooth spaces machined into the pulley circumference. This positive meshing engagement means there is no slip between the belt and the pulley — the shaft rotation angle of the driver pulley translates directly and proportionally to shaft rotation at the driven pulley, with the ratio determined by the ratio of tooth counts between the two pulleys. This zero-slip, synchronous transmission is the fundamental reason timing belt pulleys are specified for applications requiring precise speed ratio maintenance or positional accuracy, such as CNC axis drives, servo motor couplings, cam shaft drives in printing machinery, and film transport mechanisms.

In the L075 straight bore timing pulley, the 9.525 mm pitch means that each tooth occupies 9.525 mm of belt circumference, and each complete revolution of an N-tooth pulley advances the belt by N × 9.525 mm. The flanges machined at each face of the toothed section prevent the timing belt from walking axially off the pulley face during operation — a critical function in horizontal drives and any installation where the shaft is not perfectly horizontal, since even a small axial force on the belt will cause progressive migration without the flange barrier. The L075 flanges are dimensioned to extend above the belt edge by an amount consistent with the ANSI standard, providing lateral retention without the flange contacting the belt face and generating friction heat. The straight bore through the hub accepts the drive shaft, and the set screw pressing against the shaft flat or keyway transmits the torque from shaft to pulley. The bore dimension is sized conservatively to provide adequate wall thickness at the smallest tooth counts — this is why the bore is only 8 mm for the 10T and 12T pulleys, increasing to 11 mm from 13T onwards and 14 mm from 49T onwards as the hub diameter grows with the pitch circle.

The timing pulley and belt combination in the L series achieves transmission efficiencies typically above 98%, significantly better than the 92–96% typical of V-belt drives. This efficiency advantage translates directly to reduced motor energy consumption over the life of the machine, which has become an increasingly important specification consideration for global OEM buyers designing machinery to meet CE marking efficiency requirements under the EU Ecodesign Regulation, and for buyers in markets with high industrial electricity costs such as Germany, Italy, and Japan. The no-lubrication maintenance requirement of the synchronous belt drive (unlike chain drives, which require periodic oil application) further reduces operating cost and eliminates the contamination risk that lubricant application introduces in food processing, pharmaceutical, and cleanroom applications.

5. Materials and Construction Quality

The material selection strategy for the EP-L075 series reflects the engineering requirements at each size point in the range. For tooth counts from 10T to 48T, the smaller pitch diameters (30.32 mm to 145.53 mm) require steel as the hub and tooth material to provide adequate wall thickness at the bore area and fatigue strength at the tooth root. The steel used is medium-carbon steel, typically equivalent to C45 or SAE 1045, which provides a good combination of machinability for bore and tooth profile precision, surface hardness for tooth wear resistance, and core toughness for impact resistance. The bore and tooth profile are precision-machined on CNC turning and hobbing equipment to the dimensional tolerances required by the ANSI standard.

For tooth counts from 49T to 120T, the larger pitch diameters (148.56 mm to 363.83 mm) shift to cast iron, which is the standard material for large timing pulleys across the global industry. Cast iron provides excellent vibration damping — an important property at large diameters where tooth mesh frequency vibration can otherwise be amplified by the structural resonance of the pulley disk — and it is significantly less expensive than steel at large cast volumes. The grey cast iron used in the EP-L075 cast iron variants conforms to standards equivalent to ASTM A48 Class 30 or ISO 185 Grade 200, providing a minimum tensile strength of approximately 200 MPa. Cast iron timing pulleys of this size are widely used in industrial printing machinery, large conveyor drive heads, and production machine tool main spindle drives where the combination of size, vibration damping, and cost efficiency makes the material the optimal choice. Both steel and cast iron variants receive a black oxide or enamel protective coating on external non-functional surfaces to prevent surface rust during storage and shipping.

The tooth profile geometry is machined to the 40° included angle trapezoidal standard for the L series, with the specific addendum, dedendum, and root radius values specified in ANSI MIL-T-23360 (the governing standard for timing belt pulleys). The pitch line on the pulley tooth corresponds to the pitch line of the mating timing belt, and the difference between the outside diameter (De) and the pitch diameter (Dp) in the table — consistently approximately 0.76 mm across the entire range — reflects this standard pitch line correction that positions the belt pitch line correctly relative to the pulley tooth.

6. Regulatory and Standards Compliance: Global Market

The EP-L075 straight bore timing pulley series is designed to satisfy the technical requirements of global industrial machinery procurement and regulatory frameworks. The applicable dimensional standards for L series timing pulleys are ANSI MIL-T-23360 (United States), which defines the tooth profile, pitch, and dimensional tolerances for all standard inch-pitch timing belt pulleys, and ISO 5294 for timing belt pulleys more generally. European machinery incorporating L series timing pulleys must comply with the EU Machinery Directive 2006/42/EC (and its successor, EU Machinery Regulation 2023/1230, which will become mandatory from January 2027), which requires that power transmission components be correctly specified for the rated machine loads, with documentation in the machine technical file. The pulley material, tooth profile standard, and maximum shaft torque capacity must be stated in the machine technical file for CE marking compliance. The EP-L075 series supports this documentation requirement with the dimensional data table presented above and with material compliance certificates available on request.

In the United States, industrial machinery incorporating timing belt pulleys is subject to OSHA 29 CFR 1910.219 for mechanical power transmission apparatus, which requires that rotating components including pulleys and belts be adequately guarded against accidental contact. ANSI B11 machine safety standards address similar requirements for specific machine tool types. This pulley is not a regulated product requiring independent certification, but its correct specification and installation within a machine is part of the machine builder's safety engineering obligation. In Japan, the relevant standard for power transmission components in industrial machinery is JIS B 1856 (timing pulleys), which specifies equivalent dimensional standards to the ANSI L series for the same pitch. Japanese industrial equipment buyers can source EP-L075 series straight bore timing pulleys with confidence that the dimensional specifications are compatible with JIS B 1856-compliant timing belts available in the Japanese market.

7. Application Scenarios

The L series straight bore timing pulley is one of the most widely deployed power transmission components in global industrial machinery. The combination of 9.525 mm pitch, medium-duty load capacity, and the broad range of available tooth counts makes the EP-L075 the standard specification for a wide variety of applications across many industrial sectors.

8. About Us - Timing Pulley Manufacturer

Our China timing pulley manufacturing group produces a comprehensive range of standard and custom timing belt pulleys across all major synchronous belt pitch families: MXL, XL, L, H, XH, XXH (inch series), T2.5, T5, T10, AT5, AT10, AT20 (metric series), HTD (3M, 5M, 8M, 14M), and GT2/GT3 profiles. As a professional timing pulley manufacturer, our production facilities are equipped with CNC gear hobbing machines, precision CNC turning centres, and CMM dimensional inspection equipment operating under ISO 9001:2015 quality management certification. We supply global OEM machine builders, industrial distributors, and aftermarket replacement buyers across Europe, North America, Southeast Asia, the Middle East, and South America. Technical documentation including dimensional drawings, material certificates, and ANSI/ISO conformance data is available for all standard range items. Custom timing pulleys with non-standard bore sizes, keyways, spigot flanges, or special materials are produced to drawing with lead times confirmed at order placement. Contact our technical team for product selection guidance, OEM customisation enquiries, or volume pricing for high-turnover aftermarket applications.

9. Related Products — Complete Synchronous Drive System

The EP-L075 is the core component of a complete L series synchronous belt drive system. We supply compatible components that integrate with this pulley series, enabling global OEM buyers and distributors to source complete drive assemblies from a single technically consistent supplier.

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Metric pitch toothed bars (timing belt rack equivalents) are used in linear synchronous drive applications where a timing belt pulley drives a toothed bar for linear motion rather than rotary motion. These are used in CNC linear axis drives, printing press registration tables, and industrial positioning systems. Toothed bars in T5, T10, AT5, AT10, and HTD metric pitches are available from our product range, providing the linear drive complement to the rotary timing pulleys. When designing a belt-driven linear axis, the metric pitch toothed bar specification must be matched to the timing belt pitch and profile used on the driver pulley to ensure correct tooth engagement.

V-Belt Pulleys

Our V-belt pulley range complements the timing pulley product family for applications where fractional slip is acceptable and the cost advantage of V-belt drives over synchronous belt drives is the priority. Many industrial machines use a combination of synchronous belt drives (timing pulleys) for precision-position-critical axes and V-belt drives for auxiliary loads such as cooling fans, oil pumps, and non-critical conveyors. Sourcing both V-belt pulleys and timing belt pulleys from the same supplier simplifies documentation, reduces supplier qualification effort, and ensures consistent coating and surface finish standards across both pulley types in the same machine.

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