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When your motion system demands repeatable accuracy, a worn or mismatched HTD-5M timing belt pulley becomes the weakest link in your build. Whether you are upgrading a 3D printer extruder drive, tuning a CNC router axis, or assembling a custom robotics platform, this HTD-5M timing belt pulley delivers the dimensional consistency and tooth engagement needed to keep every move on target.
Each pulley is machined to the HTD-5M profile with a 5 mm pitch and a 21 mm belt-contact width. The tooth count spans 10 T to 45 T (5M10T through 5M45T), and bore options range from 5 mm to 20 mm (approximately 0.20 in to 0.79 in). Two hub styles are available: K-type (solid hub, set-screw retention) and BF-type (flanged hub with through-bore, suitable for shaft-end mounting).
Typical applications include 3D printer X/Y/Z axis drives and extruder gearing, CNC router and laser-cutter belt-drive axes, servo and stepper motor timing systems, and light-duty conveyor or indexing mechanisms where synchronous belt drive pulleys with a 5 mm pitch are specified.
Available from 10 T to 45 T, letting you dial in the exact gear ratio for your drive system without custom machining.
Rounded tooth profile reduces belt stress and backlash compared to trapezoidal profiles, improving positional accuracy in motion-control applications.
K-type solid hub with set-screw for mid-shaft mounting; BF-type flanged hub for shaft-end or through-bore installations — choose the style that fits your assembly.
Bore options from 5 mm to 20 mm (including 6.35 mm / ¼ in and 12.7 mm / ½ in imperial sizes) cover the most common stepper and servo motor shaft diameters.
Consistent 21 mm working width across all tooth counts ensures belt tracking stability and uniform load distribution along the tooth face.
Standard HTD-5M dimensions make these pulleys interchangeable with OEM components on popular 3D printer and CNC platforms without frame modification.
| Belt Profile | HTD-5M |
|---|---|
| Pitch | 5 mm (0.197 in) |
| Belt Width (Working) | 21 mm (0.83 in) |
| Number of Teeth | 10 T – 45 T (see variant options) |
| Hub Style | K-type (set-screw) / BF-type (flanged) |
| Bore Diameter | 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20 mm (see variant options) |
| Pitch Diameter | See variant options |
| Outside Diameter | See variant options |
| Material | See variant options |
| Finish | See variant options |
| Set Screw (K-type) | Contact us to confirm |
| Flange Diameter (BF-type) | Contact us to confirm |
The tooth count determines the pitch diameter and, combined with your motor pulley, sets the drive ratio. For 3D printers, 20 T is the most common motor-side pulley. For CNC routers, match the tooth count to your required linear travel per motor revolution. Use the formula: pitch diameter (mm) = (teeth × pitch) ÷ π = (teeth × 5) ÷ π.
K-type pulleys have a solid hub with one or two set screws that clamp onto the shaft — ideal for mid-shaft mounting where the pulley sits between two bearings. BF-type pulleys have a flanged hub designed for shaft-end mounting, often used with a key or additional fastener for higher-torque applications.
Most NEMA 17 stepper motors have a 5 mm shaft; select the 5 mm bore. NEMA 23 motors typically use an 8 mm or 6.35 mm (¼ in) shaft. Servo motors vary — check your motor datasheet for the exact shaft diameter before ordering. The 6.35 mm and 12.7 mm bore options are provided for imperial-shaft motors.
Yes, provided your belt is an HTD-5M profile with a width of 21 mm or narrower. The HTD-5M tooth profile is standardised, so these pulleys are compatible with any HTD-5M open-end or closed-loop belt from any manufacturer. Do not use with MXL, GT2, or other non-HTD-5M profiles.
Set-screw retention is suitable for the torque levels typical of NEMA 17 and NEMA 23 stepper motors in 3D printing and light CNC use. For higher-torque applications, consider using a shaft with a flat (D-shaft) to improve grip, or select a BF-type pulley with a key slot if available for your size.
The corrosion resistance depends on the material and finish of the specific variant. If your application involves moisture, chemicals, or outdoor exposure, please contact us to confirm the material specification for your chosen variant before ordering.
HTD-5M pulleys with a 20 T tooth count and 5 mm bore are a direct fit for many Creality, Prusa, Voron, and similar open-frame 3D printers that use 5M belt drives. Always verify the tooth count, bore, and hub style against your printer's BOM or service manual before purchasing.
