XL 36T-100T Timing Belt Pulley Pitch 5.08mm With Step Drive Pulleys Width 11mm

Tooth count determines the pitch diameter and, combined with your belt length and the mating pulley, sets your drive ratio. For CNC gantry axes, 36T–40T pulleys are common on motor shafts paired with a matching idler or driven pulley. Larger counts (60T–100T) are used where you need a larger pitch diameter to reduce belt wrap angle stress or to achieve a speed-reduction stage. Calculate your required ratio first, then select tooth counts accordingly.

Measure your motor or drive shaft diameter with calipers before ordering. Common stepper motor shaft diameters are 5mm, 6.35mm (1/4"), 8mm, and 10mm. Select the bore that matches your shaft exactly — the step-hub set screw provides clamping, but an oversized bore will not grip reliably. If your shaft is 5mm, contact us to confirm availability, as the listed minimum bore is 6mm.

Yes. These pulleys conform to the XL profile standard (5.08mm / 0.200" pitch). Any XL-profile timing belt with an 11mm width will mesh correctly. If your existing belt is a different pitch (e.g., T5, GT2, or MXL), it will not be compatible — verify the pitch marking on your belt before purchasing.

These pulleys are machined from aluminum alloy (typically 6061-series), which offers a good balance of tensile strength, low rotational inertia, and machinability. For light-to-medium duty synchronous drives — CNC routers, 3D printers, laser cutters, and small automation stages — aluminum XL pulleys are the standard choice. For very high-torque or heavy-load applications, consider steel pulleys instead.

Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor workshop and lab environments. For outdoor or high-humidity installations, applying a light machine oil or anodizing the surface will extend service life. These pulleys are not recommended for direct immersion or highly corrosive chemical environments without additional surface treatment.

Yes. You can use two pulleys from this range — one on the motor shaft and one on the driven shaft — as long as both share the same XL pitch profile and your belt width is 11mm. Choose tooth counts to achieve your desired speed ratio. For a 1:1 ratio, select the same tooth count on both pulleys; for speed reduction, use a smaller tooth count on the motor side and a larger count on the driven side.

These pulleys use a set-screw (grub screw) clamping method via the step-hub bore. A keyway is not required for most light-duty applications. For higher-torque applications where rotational slip is a concern, a flat ground on the shaft (D-shaft) aligned with the set screw significantly improves holding torque. Ensure the set screw is tightened with the appropriate hex key to the recommended torque for your shaft diameter.