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When a slipping or mismatched pulley causes your belt-driven system to lose synchronization, the entire machine pays the price — whether it's a 3D printer skipping steps, a CNC axis losing position, or a conveyor running out of phase. This 3M timing belt drive pulley is engineered for engineers, makers, and machine builders who need a reliable, hub-free synchronous drive component that drops straight into their design without compromise.
Each pulley is machined from aluminum alloy with a natural silver finish, featuring a 3mm pitch tooth profile (Type AF, no hub) compatible with standard 3M HTD and 3M GT2-style timing belts up to 10mm (3/8 inch) wide. Tooth counts range from 15T to 50T, with bore sizes from 4mm to 20mm (approximately 0.16 in to 0.79 in). Outside diameter scales with tooth count — a 15T pulley measures approximately 14.3mm (0.56 in) OD, while a 50T pulley reaches approximately 47.7mm (1.88 in) OD.
Typical use cases include 3D printer X/Y axis drives requiring a 3M 15T or 20T pulley with 5mm bore, CNC router Z-axis lead screw assist using a 25T or 30T pulley with 8mm bore, and light-duty conveyor or indexing table drives using a 40T or 50T pulley with 10–20mm bore for reduced speed and increased torque.
Type AF no-hub profile keeps axial length minimal — ideal for compact drive assemblies where space is constrained.
Precision-cut 3mm pitch teeth mesh cleanly with 3M HTD and GT2-style belts, maintaining synchronization under load.
Available in 15T, 20T, 25T, 30T, 40T, and 50T — covering a broad gear ratio range from high-speed to high-torque applications.
Bore sizes from 4mm to 20mm accommodate common shaft diameters used in stepper motors, servo motors, and drive shafts.
Lightweight yet rigid aluminum alloy body reduces rotational inertia while maintaining dimensional stability across operating temperatures.
Order 1, 2, 3, 5, or 10 pieces per variant — stock spares or build multi-axis systems without separate orders.
| Belt Pitch | 3mm (3M) |
|---|---|
| Belt Type Compatibility | 3M HTD / 3M GT2-style timing belts |
| Max Compatible Belt Width | 10mm (3/8 inch) |
| Tooth Count Options | 15T, 20T, 25T, 30T, 40T, 50T |
| Bore Size Options | 4 / 5 / 6 / 7 / 8 / 10 / 12 / 14 / 15 / 16 / 17 / 18 / 19 / 20 mm |
| Hub Style | Type AF (No Hub) |
| Material | Aluminum Alloy |
| Surface Finish | Natural / Silver |
| Outer Diameter (approx.) | See variant options |
| Flange | See variant options |
| Available Pack Quantities | 1 / 2 / 3 / 5 / 10 pcs |
Tooth count determines the pulley's pitch diameter and affects your drive ratio. A smaller tooth count (e.g., 15T) gives a smaller pulley diameter — suitable for the motor side of a drive where you want speed reduction. A larger tooth count (e.g., 40T or 50T) gives a larger diameter — suitable for the driven side or where you need torque multiplication. Match your required speed ratio by dividing the driven pulley tooth count by the drive pulley tooth count.
Measure your shaft diameter with a caliper before ordering. The bore size must match your shaft diameter exactly for a secure fit. Common stepper motor shaft diameters are 5mm and 8mm; servo motors often use 6mm, 8mm, or 10mm shafts. If you plan to use a set screw or keyway, ensure the bore wall thickness is sufficient — generally avoid selecting a bore size that is more than 60–70% of the pulley's pitch diameter.
Yes. This pulley uses a 3mm pitch tooth profile that is compatible with both 3M HTD and 3M GT2-style timing belts up to 10mm wide. Always verify that both the pitch (3mm) and the belt width (≤10mm) match your belt before installing. Mixing HTD and GT2 profiles of the same pitch is generally acceptable for light-duty applications, but for precision motion control, use matched belt-and-pulley sets.
"Type AF" refers to a hub-free pulley design where the pulley body has no extended boss or flange on either side beyond the tooth face. This keeps the overall axial length compact and is ideal for applications where space is limited or where the pulley will be secured directly to a shaft using a set screw through the pulley body. If your design requires a flanged hub for shaft retention, you would need a Type BF or similar hub-style pulley instead.
Aluminum alloy pulleys are well-suited for light-to-medium duty synchronous belt drives, including 3D printers, CNC machines, robotics, and small conveyor systems. They offer a good strength-to-weight ratio and resist corrosion in typical indoor environments. For heavy industrial loads, high-temperature environments, or applications with significant side loading, consider whether a steel pulley would be more appropriate for your specific torque and duty cycle requirements.
Yes. Each variant includes a quantity option of 1, 2, 3, 5, or 10 pieces. Select the quantity that matches your build requirements — for example, a dual-axis 3D printer may need two identical pulleys, while a multi-stage conveyor system may require five or more. Ordering in larger quantities per variant is more economical than placing multiple single-unit orders.
For most light-duty applications such as 3D printers and small CNC machines, a properly tightened set screw provides adequate retention. For higher torque applications or where the shaft experiences reversing loads, consider using a shaft with a flat (D-shaft) or keyway to prevent rotation. Always apply thread-locking compound to the set screw for vibration-prone environments. The set screw is not included with the pulley — source an appropriate M3 or M4 grub screw based on your bore size.
