EP-H200 12.7MM Steel & Cast Iron Straight Bore Timing Pulley

The 58.7 mm face dimension of the H200 直孔同步带轮 enables the use of a 2-inch H pitch belt that transmits approximately 85% more power than the 1-inch H100 belt at the same tooth count, shaft speed, and center distance. This power increase is achieved without changing the tooth pitch on this straight bore timing pulley, so the belt-to-pulley engagement geometry and the kinematic ratio remain identical to an H100 drive at the same tooth counts. The only mechanical changes required for this power upgrade are the wider pulley set and belt — the shaft dimensions, bearings, and drive centers can remain unchanged, provided the shaft can carry the higher belt tension that the wider belt generates. This approach provides a more economical power upgrade path than switching to a larger pitch with all the associated design changes.

The H200 straight bore timing pulley series features hub lengths of L = 70 mm (for 14–48 teeth) and L = 75 mm (for 49–156 teeth), compared to L = 45–60 mm in the H100 series. The longer hub length provides a larger contact area between the pulley bore and the shaft surface, distributing the keyway torque over a wider axial span that reduces the peak pressure at the key ends and decreases the risk of fretting wear and corrosion at the bore-shaft interface under sustained cycling. The longer hub also gives the grub screw or end-plate retention fasteners a larger lever arm for clamping force, improving positional security of this straight bore timing pulley in reversing-load applications. For heavy industrial drives where the shaft torque transmitted through the H200 pulley is high, this extended hub engagement is a meaningful reliability improvement over shorter hub alternatives.

The H200 straight bore timing pulley tooth form, pitch circle geometry, and bore concentricity conform to ANSI/RMA IP-24 and ISO 5294 dimensional requirements for H pitch pulleys, ensuring that the 2-inch (50.8 mm nominal) H belt from any ANSI-compliant manufacturer meshes correctly with the H200 pulley. The H pitch is one of the most widely distributed synchronous belt pitch families globally, with belt stock held by industrial distributors in North America, Europe, East Asia, Australia, and Latin America. This global belt availability is a critical reliability factor for the straight bore timing pulley in remote industrial locations — mines, offshore platforms, agricultural processing plants — where the ability to source a replacement belt locally or via express freight determines the extent of unplanned production shutdown when a belt fails unexpectedly.

Like the H100 series, the H200 straight bore timing pulley uses steel (medium-carbon or alloy steel) for tooth counts 14–52 and grey cast iron for tooth counts 58–156. At the H200 face width, the cross-sectional area of each material is proportionally larger — the wider rim carries more belt tension load, and the wider hub distributes the shaft torque across more material. The steel pulleys at small tooth counts handle the higher centrifugal stress at the increased belt peripheral speed, while the cast iron large-diameter pulleys provide the vibration damping, machinability, and economic castability that make large cast iron timing pulleys the standard specification in heavy industrial drive engineering. The material transition at 52 to 58 teeth (approximately 210 to 234 mm pitch diameter) in this straight bore timing pulley aligns with the transition from higher-speed steel service to lower-speed cast iron service that characterizes H pitch drive system design for most industrial applications.

The bore reference dimension (d) in the H200 straight bore timing pulley series ranges from 11 mm (for 14–17 tooth steel pulleys) through 19 mm (for 42–52 tooth steel and small cast iron types) to 24 mm and 28 mm (for larger cast iron pulleys), reflecting the progressively larger minimum bore that the wider H200 hub can accommodate before the keyway depth infringes on the hub wall thickness minimum. This range covers the standard shaft diameter progression in industrial conveyor and process machinery from approximately 12–15 mm servo motor output shafts through the 25–50 mm shafts common in medium-duty industrial gearbox outputs. Custom bore machining above the standard reference diameter is available on request, accommodating non-standard shaft sizes encountered in retrofit and upgrade applications across the global industrial maintenance market.

Heavy-duty conveyor systems at mining operations, aggregate processing plants, and port bulk material terminals require straight bore timing pulley drives that can handle the high starting torques and sustained heavy loads of these applications without belt slippage. The H200 正时皮带轮 straight bore timing pulley provides the power capacity for large conveyor drives — particularly at the indexing and metering conveyor positions where precise position-holding between belt movements defines product quality — without requiring the wider XH pitch pulleys that occupy significantly more installation space. Operators in Australia, South Africa, Chile, and Kazakhstan regularly specify the H200 straight bore timing pulley for these applications, valuing the wide global H pitch belt availability for maintenance in remote mine locations.

Large-format food processing lines — industrial bread ovens, meat processing conveyors, canned goods filling lines — use H200 straight bore timing pulley timing belt drive pulley systems at their main line shaft positions where the synchronized motion of multiple process stations must be maintained simultaneously. The 2-inch H belt matched to this straight bore timing pulley allows these demanding drives to be accomplished within the clean-design constraints of food contact machinery, where belt cover access for maintenance must be simple and rapid. H pitch belts are available in food-grade versions with white or FDA-compliant materials, and the H200 straight bore timing pulley standard bore and keyway design allows removal for equipment sanitization cleaning without special tooling. European food processing equipment OEMs in Germany, the Netherlands, Denmark, and Spain commonly specify H200 drives in their machine platforms.

Positive displacement pumps and air compressors that require precise speed ratio use H pitch straight bore timing pulley drives as an alternative to direct coupling or V-belt arrangements. The H200 straight bore timing pulley series covers the power levels of medium and large industrial rotary positive displacement pumps where the steady, shock-free load and the importance of accurate speed ratio for pump output calculation make synchronous belt drives preferable. The belt straight bore timing pulley connection allows easy speed ratio adjustment by changing the pulley pair without relocating the pump — particularly valuable in pump testing and chemical dosing applications in Korea, Taiwan, and India where process optimization requires frequent drive ratio adjustment during commissioning.

Large-format web offset printing presses and papermaking equipment use H200 straight bore timing pulley drives at the main line shaft positions where the simultaneous synchronization of multiple print units or machine sections requires perfect speed ratio maintenance across the full power range from idle to maximum speed. The H200 straight bore timing pulley wider belt provides the high torque transmission needed at slow speeds during press start-up — when the line shaft accelerates from rest to production speed while all mechanical loads are simultaneously engaged — without requiring belt tensioner idler designs that add mechanical complexity to the main drive system. Printing equipment OEMs in Japan, Germany, Switzerland, and the United States specify H200 straight bore timing pulley drives in their large-format presses as the standard main drive configuration.

Large-format CNC machining centers, heavy-duty lathes, and floor-type boring mills use H200 straight bore timing pulley synchronous drives in their main spindle drive stages where the high cutting power transmitted between the motor and spindle exceeds the H100 belt capacity. The new straight bore timing pulley H200 series in steel (24–48 tooth range) covers the small-diameter high-speed spindle drive positions on these machines, where the pulley must be light enough not to add excessive inertia to the spindle acceleration profile while transmitting the full rated spindle power. Machine tool OEMs in South Korea, Taiwan, and Italy specify H200 straight bore timing pulley drives in their heavy-duty machining platforms where the cutting power requirement exceeds the capacity of the more commonly used XL and L pitch drives in standard CNC machines.

The H200 straight bore timing pulley series conforms to ANSI/RMA IP-24 H pitch tooth form and pitch circle diameter specifications. The "200" belt width designation follows the ANSI H belt naming convention where the number represents 10 × face width in tenths of an inch (200 = 2.000 inch = 50.8 mm nominal face width). All H200 straight bore timing pulley products produced to IP-24 dimensional specifications are interchangeable with H200 belts from any ANSI-compliant belt manufacturer worldwide — providing the global sourcing flexibility critical for operations in North America, Latin America, and any market where ANSI standards govern mechanical component procurement.

ISO 5294 and ISO 5296 define H pitch synchronous belt and pulley dimensional requirements for international markets outside the North American ANSI framework. These ISO standards are reference documents for European, Japanese, Australian, and South Korean straight bore timing pulley procurement specifications. The H200 series' compatibility with ISO 5294 H pitch specifications ensures that buyers in these markets can specify and procure the H200 straight bore timing pulley against their ISO-referenced mechanical design standards, and that the replacement H200 belts can be sourced from ISO-compliant belt manufacturers in their regional markets.

Drive components including the H200 直孔同步带轮 installed in machinery for the EU market must be selected to meet the essential safety requirements of the Machinery Directive, with the pulley-belt combination rated for the application's calculated drive power with a service factor applied. For food processing machinery specifically, the belt material must comply with Regulation (EC) No 1935/2004 on materials in contact with food when food-grade belt variants are installed. Technical file documentation for CE-marked machinery incorporating the H200 straight bore timing pulley should include the pulley dimensional specification, belt rated power data, and the service factor calculation confirming adequate design margin.

JIS B 1856 specifies synchronous belt drive pulleys for the Japanese industrial market, with H pitch specifications dimensionally equivalent to ANSI/RMA IP-24 and ISO 5294. China timing pulley products manufactured to H pitch specifications are fully compatible with Japanese JIS B 1856 requirements at the H200 series level — Japanese printing press OEMs and food processing equipment builders who source H200 pulleys from global suppliers require this cross-standard compatibility to ensure that locally available replacement belts can be used during scheduled maintenance at Japanese facilities.

For system designs that combine the rotary H200 正时皮带轮 straight bore timing pulley drive with a linear rack-and-belt stage — common in long-travel linear positioning systems on large-format CNC machines and gantry-type industrial automation — we supply Metric Pitch Standard Toothed Bars to complement the rotary pulley stage. These toothed bars allow the same belt engaged on the H200 pulley to drive along a rack with the same pitch, producing linear motion from the rotary motor drive in a compact, standard-pitch system that does not require a separate linear actuator. This combined rotary-linear straight bore timing pulley architecture reduces the total drive system component count in industrial automation applications.

In multi-stage heavy industrial drive systems, a V-belt primary stage handles the bulk power transmission from the motor to an intermediate shaft, while the H200 straight bore timing pulley synchronous secondary stage provides accurate speed ratio from the intermediate shaft to the process equipment. Our V-belt pulley range — covering SPZ, SPA, SPB, SPC, and A/B/C/D groove profiles in cast iron and steel — provides the heavy-duty primary stage counterpart for H200 secondary drives in conveyor, pump, and processing equipment applications. Bore specifications across the straight bore timing pulley and V-belt ranges align with the standard shaft diameter progression used in industrial gearbox and motor output shafts, simplifying the combined drive specification in new machine designs and retrofit projects.