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When a slipping or misaligned pulley brings your CNC router, 3D printer, or automation rig to a halt, the root cause is almost always a poorly matched bore or an undersized groove. Engineers, makers, and machine builders who need a drop-in 3M pitch synchronous wheel with a positive step shoulder will find this 3M-24T timing belt pulley built exactly for that job.
Each pulley is machined from aluminum alloy, featuring 24 teeth on a 3M (3 mm pitch) tooth profile. The groove width options span 11 mm (~0.43 in) and 16 mm (~0.63 in) to match standard 10 mm and 15 mm wide timing belts respectively. Bore diameters range from 5 mm to 12.7 mm (~0.20–0.50 in), available in BF-type (set-screw clamping) and K-type (keyway) configurations. The integrated step shoulder locks axial belt position without additional collars.
Typical applications include DIY CNC gantry drives requiring a 3M-24T synchronous pulley with keyway, desktop 3D printer X/Y axis upgrades needing a lightweight aluminum timing pulley, and small automation conveyor systems where a stepped belt pulley prevents lateral belt walk.
| Tooth Profile | 3M (3 mm pitch) |
|---|---|
| Number of Teeth | 24T |
| Groove Width | 11 mm (for 10 mm belt) / 16 mm (for 15 mm belt) |
| Bore Diameter | See variant options (5 mm – 12.7 mm) |
| Bore Type | BF-type (set-screw) / K-type (keyway) — See variant options |
| Keyway Dimensions | See variant options (3×1.4 mm or 4×1.8 mm where applicable) |
| Material | Aluminum alloy |
| Pitch Diameter | Approx. 22.9 mm (~0.90 in) |
| Compatible Belt Width | 10 mm / 15 mm |
| Pack Quantity | See variant options (1 / 2 / 5 / 10 / 20 Pcs) |
| Weight (per piece) | See variant options |
BF-type pulleys use a radial set-screw to clamp onto a smooth (plain) shaft — ideal for quick installation and repositioning. K-type pulleys have a machined keyway that mates with a key on the shaft, providing a positive mechanical lock that handles higher torque without slipping. If your motor or drive shaft has a keyway, choose K-type; otherwise BF-type is the simpler option.
Select the 11 mm groove width variants when your timing belt is 10 mm wide, and the 16 mm groove width variants when your belt is 15 mm wide. The groove is intentionally slightly wider than the belt to allow free running without binding.
Measure your motor or drive shaft diameter with a caliper. Available bore sizes include 5 mm, 6 mm, 6.35 mm (1/4 in), 7 mm, 8 mm, 10 mm, and 12 mm / 12.7 mm (1/2 in). Choose the bore that matches your shaft exactly — a loose fit will cause vibration and premature wear.
Yes. The aluminum alloy body provides sufficient rigidity for typical CNC router gantry drives, 3D printer X/Y axes, and light conveyor systems running at moderate speeds and loads. For heavy-duty industrial drives with high continuous torque, consult the load ratings of your specific belt and motor before ordering.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor workshop and light-outdoor conditions. For prolonged exposure to moisture, salt spray, or aggressive chemicals, consider applying an anodizing treatment or a protective coating after installation.
The tooth pitch (3M) must match your belt's pitch — that is non-negotiable. However, the belt width must also be compatible with the groove width: a 10 mm belt should run in the 11 mm groove variants, and a 15 mm belt in the 16 mm groove variants. Using a belt significantly narrower than the groove may cause lateral drift; a belt wider than the groove will not seat correctly.
Keyway dimensions vary by bore size. The product variants specify the keyway dimensions in the option name where applicable (e.g., 3×1.4 mm or 4×1.8 mm). Please check the selected variant's option label or contact us to confirm the exact keyway specification for your chosen bore.
For a single repair or prototype build, the 1 Pcs or 2 Pcs options keep costs low. If you are building multiple machines, running a production batch, or want spares on hand, the 5, 10, or 20-piece packs offer a lower per-unit cost. Select your quantity in the Quantity(Pcs) option above.
