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When a slipping or misaligned pulley brings your CNC router, 3D printer, or automation rig to a halt, you need a replacement you can trust to spec. This HTD-5M timing belt pulley is engineered for makers, machinists, and engineers who demand dimensional accuracy and consistent torque transfer in every build.
Each pulley is machined from 45# carbon steel and features the BF-type hub configuration — a flanged body with a through-bore that accepts a set-screw for secure shaft locking. The tooth profile follows the HTD (High Torque Drive) 5M standard: 5mm pitch, 27mm belt width (W27), with tooth counts ranging from 14T to 60T and bore options from 5mm to 30mm (approximately 0.20 in to 1.18 in).
Typical use cases include CNC axis drives requiring low backlash synchronous motion, stepper and servo motor output shafts in robotics and pick-and-place systems, and custom gearbox or conveyor builds where a specific gear ratio must be maintained across a wide range of shaft diameters.
| Belt Type | HTD-5M (High Torque Drive) |
|---|---|
| Tooth Pitch | 5 mm (0.197 in) |
| Belt Width (Face) | 27 mm (1.06 in) |
| Hub Type | BF-type (flanged, set-screw) |
| Material | 45# Carbon Steel |
| Tooth Count Options | 14T, 15T, 16T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 34T, 36T, 38T, 40T, 44T, 48T, 50T, 60T |
| Bore Diameter Options | 5, 6, 8, 10, 12, 14, 15, 16, 17, 18, 19, 20, 22, 24, 25, 28, 30 mm |
| Outer Diameter (OD) | See variant options |
| Surface Finish | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines your drive ratio. Divide the driven pulley tooth count by the driver pulley tooth count to get the ratio. For example, a 14T driver paired with a 28T driven pulley gives a 2:1 reduction. Smaller tooth counts on the motor side increase speed at the driven shaft; larger tooth counts reduce speed and multiply torque.
Match the bore diameter to your motor or shaft diameter. Common stepper motor shafts are 5mm or 8mm; NEMA 23 servos often use 6.35mm (1/4 in) or 8mm shafts. If your shaft is imperial, choose the next metric size up and use a shim or loctite for a snug fit, or contact us to confirm the closest bore option.
Yes. This pulley is designed to the HTD-5M standard: 5mm pitch, curved tooth profile, 27mm belt width. It is compatible with any HTD-5M open-end or closed-loop belt that is 27mm wide. Do not use with MXL, GT2, or trapezoidal T5 belts — the tooth profiles are not interchangeable.
45# carbon steel (equivalent to AISI 1045) has a typical tensile strength of 600–800 MPa and yield strength around 530 MPa in the normalized condition. It is widely used for gears, shafts, and pulleys in industrial machinery. For most CNC, robotics, and light conveyor applications the material is more than adequate. For very high-speed or shock-load environments, consider whether a hardened or surface-treated variant is needed.
The BF-type hub includes a set-screw that clamps against the shaft to resist axial movement. For applications with significant axial thrust, adding a shaft collar or keyway is recommended. The flanges on both sides of the tooth face also help keep the belt centered and prevent it from walking off the pulley during operation.
45# carbon steel is susceptible to surface oxidation in humid or wet conditions without a protective coating. For indoor CNC or robotics use in a dry environment, bare steel is typically fine. For outdoor or high-humidity applications, apply a light machine oil, zinc-based primer, or consider sourcing a stainless steel alternative. Contact us if you need corrosion-resistant options.
The standard bore is a plain round bore with a set-screw. Keyway machining is not included. If your shaft has a keyway, you can either use the set-screw alone (suitable for light loads) or have a local machine shop cut a matching keyway into the bore. Contact us to confirm bore tolerances before ordering if keyway compatibility is critical.
