HTD-5M 10T-40T Timing Belt Pulleys Pitch 5mm AF-type CNC Drive Pulley Width 16mm

The tooth count determines your drive ratio. Divide the driven pulley tooth count by the driving pulley tooth count to get the ratio. For example, a 20T driver paired with a 40T driven pulley gives a 2:1 reduction (half speed, double torque). For CNC and 3D printing where equal speed on both axes is needed, use identical tooth counts on both ends of the belt.

Measure your motor or drive shaft diameter with calipers. Select the bore that matches exactly — for example, a NEMA 17 stepper motor typically has a 5mm shaft, while NEMA 23 motors commonly use 6.35mm (1/4 in) or 8mm shafts. The AF-type hub uses a set screw to lock onto the shaft; ensure the bore matches your shaft OD for a secure fit.

Yes — these pulleys are designed for standard HTD 5M belts with a 5mm pitch and rounded tooth profile. They are compatible with 16mm-wide HTD 5M belts from any manufacturer that conforms to the HTD standard. Do not use with GT2, MXL, XL, or other non-HTD belt profiles, as the tooth geometry differs.

The material varies by variant — please refer to the variant options or contact us to confirm the specific material for your selected tooth count and bore combination. Common materials for this pulley type include aluminum alloy and steel, each suited to different load and weight requirements.

HTD 5M pulleys are well-suited for moderate-to-high speed synchronous drives. The rounded tooth profile reduces impact loading at engagement, making them appropriate for CNC routers, laser engravers, and 3D printers operating at typical traverse speeds. For very high-speed or high-load industrial applications, verify the rated belt speed with your belt manufacturer and ensure proper belt tension.

Each listing sells one pulley. For a complete drive system you typically need at least two pulleys (one on the motor shaft, one on the driven shaft) plus a belt of the appropriate length. If you are building a CoreXY or H-bot 3D printer, you will need multiple pulleys of the same tooth count. Add the quantity you need to your cart using the Amount option.

Mount one pulley on a sliding or pivoting motor mount to allow belt tension adjustment. The belt should be taut enough that it does not skip teeth under load, but not so tight that it causes excessive bearing wear. A common rule of thumb is that the belt should deflect approximately 1–2mm per 100mm of free span when pressed with light finger pressure. Consult your belt manufacturer's tensioning guidelines for precise values.