HTD-3M 12-46Teeth Timing Belt Pulleys Pitch 3mm CNC Synchronous Wheel Width 16mm

Tooth count determines your drive ratio. Divide the driven pulley tooth count by the driving pulley tooth count to get the speed reduction ratio. For a 1:1 ratio (same speed on both shafts), use identical tooth counts on both pulleys. For CNC axes, match the tooth count to your steps-per-mm calculation based on motor step angle, microstepping, and belt pitch.

K-type pulleys have a keyway slot machined into the bore, allowing a key to be inserted between the shaft and pulley for positive rotational locking — ideal when high torque or reversing loads are present. BF-type pulleys have flanges on both sides of the belt groove that physically retain the belt on the pulley, preventing lateral belt walk-off. BF-type pulleys are commonly used when only one pulley in a drive system has flanges.

Measure your motor or drive shaft diameter with a caliper. Select the bore size that matches your shaft exactly — a bore that is too large will cause runout and vibration. Common NEMA 17 stepper motor shafts are 5 mm; NEMA 23 shafts are typically 6.35 mm (1/4 in) or 8 mm. Verify your shaft diameter before ordering.

No. These pulleys use the HTD-3M curvilinear tooth profile with a 3 mm pitch. GT2 belts also have a 2 mm pitch and a different tooth geometry. HTD-3M pulleys are not interchangeable with GT2 pulleys or belts. Always pair HTD-3M pulleys with HTD-3M belts of the correct width (16 mm for this series).

Aluminum alloy construction provides adequate strength for CNC router axes, 3D printer motion systems, and light automation drives. Maximum torque capacity depends on tooth count, bore size, and belt tension — for heavy industrial or high-shock applications, consult the torque ratings for your specific belt and pulley combination. These pulleys are not rated for heavy industrial conveyor or press applications.

The anodized aluminum surface provides good resistance to oxidation and mild chemical exposure typical of workshop environments (cutting fluid mist, humidity). Anodizing is not suitable for immersion in strong acids or alkalis. For outdoor or high-humidity enclosures, consider adding a light machine oil wipe to exposed surfaces periodically.

Yes — this is a common and accepted practice. In a two-pulley drive, it is standard to flange one pulley (typically the smaller driving pulley) to guide the belt laterally, while the other pulley remains unflanged. This reduces belt edge wear while still preventing belt walk-off during operation.