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When your CNC router, 3D printer, or industrial conveyor demands precise, slip-free power transmission, a mismatched or worn pulley becomes the weakest link in your entire drivetrain. Engineers, makers, and machine builders who need consistent torque transfer without belt slippage rely on HTD-8M timing belt pulleys to keep their systems running true. These BF-type synchronous wheels are designed for the 8M HTD belt profile — the workhorse of medium-to-heavy-duty timing drive systems.
Each pulley is machined from solid steel or aluminum alloy (material varies by variant — see variant options) and features the HTD (High Torque Drive) 8mm pitch tooth profile. The belt contact width is 27mm (approximately 1.06 inches), and tooth counts range from 12T to 60T, covering pitch diameters from roughly 30mm (1.18 in) for 12T up to approximately 152mm (5.98 in) for 60T. Bore sizes span 8mm through 30mm to accommodate a wide range of shaft diameters. The BF-type hub includes a through-bore with a keyway slot and dual set-screw positions for secure shaft locking.
These pulleys are well-suited for CNC router X/Y axis drives, laser cutter gantry systems, automated conveyor belt assemblies, robotic arm joint actuators, and custom power transmission builds where an 8M HTD belt is already specified. The standardized HTD-8M tooth form ensures interchangeability with any compliant 8M timing belt on the market.
Includes a through-bore with keyway slot and dual set-screw positions for firm, vibration-resistant shaft locking without slippage under load.
The 8mm pitch HTD (High Torque Drive) curvilinear tooth form distributes belt load across a larger contact area, reducing tooth shear stress compared to trapezoidal profiles.
Sixteen tooth count options from 12T to 60T let you dial in your exact gear ratio for speed reduction or torque multiplication without custom machining.
Available in bore diameters from 8mm to 30mm (including 12.7mm for imperial shafts), covering the majority of stepper motor, servo motor, and gearbox output shaft sizes.
The 27mm (1.06") belt contact width matches standard HTD-8M-27 belt widths, ensuring full tooth engagement across the belt face for even load distribution.
Tooth pitch and bore concentricity are held to tight tolerances, ensuring smooth belt tracking and minimizing vibration in high-cycle or high-speed drive systems.
| Belt Profile | HTD-8M (High Torque Drive, 8mm pitch) |
|---|---|
| Pulley Type | BF-Type (through-bore with keyway) |
| Belt Width Compatibility | 27mm (1.06 in) |
| Tooth Count Options | 12T, 14T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 40T, 44T, 50T, 60T |
| Bore Diameter Options | 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, 20, 22, 24, 25, 28, 30mm |
| Pitch Diameter Range | ~30.6mm (12T) to ~152.8mm (60T) |
| Hub Style | BF — flanged hub with keyway slot and set screws |
| Material | See variant options |
| Finish / Colour | See variant options |
| Weight | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines the pulley's pitch diameter and, combined with your driven pulley's tooth count, sets your drive ratio. Divide the driven pulley teeth by the driver pulley teeth to get the speed reduction ratio. For example, a 12T driver paired with a 24T driven pulley gives a 2:1 reduction — half the speed, double the torque. Use a smaller tooth count for compact, high-speed setups and a larger tooth count when you need more torque or a larger pitch diameter for belt wrap.
Match the bore diameter to your motor or gearbox output shaft diameter. Common stepper motor shaft sizes are 5mm, 6.35mm (1/4"), 8mm, and 10mm. Servo motors often use 14mm, 17mm, or 19mm shafts. If your shaft is imperial (e.g., 1/2" = 12.7mm), select the 12.7mm bore option. The BF-type hub includes a keyway and set screws, so the bore must match the shaft — it cannot be bored out after purchase.
These pulleys are designed exclusively for HTD-8M timing belts with a 27mm (or narrower) belt width. The HTD-8M designation means an 8mm pitch with the HTD curvilinear tooth profile. Do not use with trapezoidal (T8, AT8) or other pitch belts — the tooth form is not interchangeable. Ensure your belt is rated for 27mm width or use a narrower belt with appropriate flanges.
The HTD-8M profile is rated for medium-to-heavy-duty power transmission. The 8mm pitch and curvilinear tooth form handle significantly higher torque than smaller pitch systems (e.g., GT2 2mm or HTD-5M). Actual load capacity depends on the tooth count (more teeth in mesh = higher capacity), belt tension, and operating speed. For critical load calculations, refer to the belt manufacturer's power rating tables for HTD-8M belts at your operating RPM.
Corrosion resistance depends on the material and finish of the specific variant. Aluminum alloy pulleys offer good natural corrosion resistance for indoor and light-outdoor use. Steel pulleys may have a surface treatment (such as black oxide or zinc plating) for added protection. For high-humidity or washdown environments, confirm the material and finish of your selected variant, or contact us to confirm suitability.
Yes. HTD-8M pulleys are symmetrical in tooth form and can be used on either the driving (motor) side or the driven (load) side. Simply select the appropriate tooth count for each position to achieve your desired drive ratio. Using the same tooth count on both sides gives a 1:1 ratio with no speed change.
BF-type pulleys feature a through-bore (the bore passes completely through the hub) with a keyway slot and set screws. This allows the pulley to be locked onto a keyed shaft for positive torque transmission. Other common styles include "B-type" (solid hub, no flange) and "A-type" (no hub, press-fit). The BF designation on these pulleys indicates a flanged rim on both sides of the belt contact surface, which helps keep the belt tracking centered on the pulley.
