8M 28T-60T Timing Belt Pulley Synchronous Wheel Select Bore For 30mm Width Belt

The tooth count determines your pulley's pitch diameter and, when paired with a driven pulley, sets your drive ratio. A smaller tooth count (e.g., 28T) gives a smaller diameter and higher speed on the driven shaft when paired with a larger pulley. A larger tooth count (e.g., 60T) gives a larger diameter and more torque multiplication. Calculate your required ratio first, then select the tooth count combination that achieves it within your center-distance constraints.

Order the bore size that matches your shaft diameter exactly. For example, if your motor shaft is 20mm, select the 20mm bore variant. If your shaft uses a key for torque transfer, select the corresponding keyway variant (e.g., "20mm Bore 6mm Keyway"). Do not order a bore larger than your shaft diameter — the pulley cannot be re-bored after purchase without machining equipment.

A plain bore pulley relies on set screws (grub screws) tightened against the shaft to prevent rotation. A keyway bore has a machined slot that accepts a standard parallel key, which provides a positive mechanical lock between the shaft and pulley. Keyway variants are recommended for higher torque applications or where the shaft direction reverses frequently, as set screws alone can loosen under shock loads.

Yes — these pulleys conform to the standard 8M tooth profile (8mm pitch, trapezoidal tooth form) and are compatible with any standard 8M synchronous timing belt from major belt manufacturers. However, they are specifically dimensioned for 30mm wide belts. Using a narrower belt (e.g., 20mm) is possible but will reduce load capacity; using a wider belt is not recommended as the belt may contact the flanges.

Aluminum alloy pulleys offer an excellent strength-to-weight ratio and are suitable for the majority of CNC, 3D printing, robotics, and light industrial automation applications. For very high torque or heavy shock-load environments (e.g., large industrial conveyors), consider whether a steel pulley would be more appropriate. For typical maker and automation builds, aluminum 8M pulleys handle the loads well within the belt's rated tension limits.

Yes. This listing is for the pulley only. You will need to purchase an 8M pitch, 30mm wide timing belt separately. When sizing your belt, calculate the required belt length based on your center distance and the pitch diameters of both pulleys in your drive system. Standard 8M belt lengths are available in a wide range of closed-loop lengths.

Yes. The 8M pulley series is a common choice for CNC router axis drives, laser cutter gantry systems, and similar motion control applications where the 8mm pitch provides a good balance of positional resolution and torque capacity. Pair with an appropriately tensioned 8M belt and ensure your motor shaft bore matches the selected variant for a secure, backlash-free connection.