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When a slipping or mismatched pulley is costing you accuracy on your CNC router, 3D printer, or automation rig, you need a drop-in replacement that fits the first time. These 5M timing belt pulleys are engineered for makers, machine builders, and small-batch manufacturers who demand repeatable motion control without constant re-tensioning.
Each pulley is machined from aluminum alloy with a natural or anodized finish and features a 5M tooth profile (5mm pitch). Bore diameters range from 5mm to 25mm (approximately 0.20" to 0.98"), and tooth counts span 10T to 100T to cover a wide range of gear ratios. All variants are designed for 20mm wide timing belts.
Typical applications include CNC gantry drives requiring precise X/Y axis positioning, open-loop stepper motor belt systems in desktop 3D printers, and conveyor or indexing mechanisms in light industrial automation. The standardized 5M pitch also makes these pulleys interchangeable with other 5M-series components for modular machine design.
| Tooth Profile | 5M (5mm pitch, synchronous) |
|---|---|
| Tooth Count | 10T – 100T (see variant options) |
| Bore Diameter | 5mm – 25mm (see variant options) |
| Compatible Belt Width | 20mm |
| Material | Aluminum alloy |
| Finish | See variant options |
| Hub Fastening | Set screw (radial) |
| Outer Diameter | See variant options |
| Flange | See variant options |
The tooth count determines your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the ratio. For example, a 20T motor pulley paired with a 40T load pulley gives a 2:1 reduction, doubling torque while halving speed. For CNC and 3D printer axes where the motor drives the belt directly, a smaller tooth count (10T–20T) is common to maximize resolution per motor step.
Match the bore to your motor shaft diameter. NEMA 17 steppers typically use a 5mm shaft; NEMA 23 steppers commonly use 6.35mm (1/4") or 8mm shafts. Servo motors vary — check your motor datasheet. If your shaft is metric, select the exact metric bore. For imperial shafts, the 6.35mm bore corresponds to 1/4" and 12.7mm corresponds to 1/2".
These pulleys use the standard 5M tooth profile (5mm pitch, trapezoidal or curvilinear depending on belt type). They are compatible with any 5M timing belt that is 20mm wide. Always verify that your belt's tooth profile (MXL, HTD 5M, or GT2 5M) matches the pulley tooth form — HTD and GT profiles are not interchangeable despite sharing the same pitch.
The set screw provides adequate holding force for typical belt-drive loads in CNC and 3D printing applications. For higher-torque applications, ensure the screw is tightened against a flat on the motor shaft (D-shaft) rather than a round shaft, which significantly increases resistance to rotation. For very high torque, consider adding a second set screw at 90° or using a keyed bore variant.
The aluminum alloy body offers natural oxidation resistance suitable for indoor and light-duty environments. For prolonged exposure to moisture, salt air, or chemicals, an anodized finish provides additional protection. These pulleys are not recommended for fully submerged or highly corrosive environments without additional sealing or coating.
Yes. The same pulley can be used on either the driving (motor) shaft or the driven shaft, provided the bore matches the shaft diameter in each position. For idler pulleys that spin freely without a shaft, a bearing-insert variant is typically required — this listing covers solid-bore driven and driving pulleys only.
HTD 5M uses a rounded, curvilinear tooth form optimized for high-torque power transmission. GT2 5M (Gates Tooth profile) uses a modified curvilinear form with slightly different root geometry, offering improved backlash performance. The two profiles share the same 5mm pitch but are not fully interchangeable — mixing HTD pulleys with GT2 belts (or vice versa) can cause premature wear. Confirm your belt's tooth profile before ordering.
