HTD-5M 46T-60T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 27mm

The tooth count determines your drive ratio when paired with a specific belt length and a second pulley. A higher tooth count (e.g., 60T) gives a larger pitch diameter, which reduces belt wrap stress and is better suited for high-torque, lower-speed applications. A lower tooth count (e.g., 46T) produces a smaller pitch diameter, useful when space is limited. Calculate your required ratio by dividing the driven pulley tooth count by the driving pulley tooth count.

Select the bore that matches your motor or gearbox output shaft diameter exactly. Common stepper motor shafts are 5 mm, 6 mm, or 6.35 mm (1/4"). Servo motors often use 8–14 mm shafts. Measure your shaft with calipers before ordering. The expansion sleeve clamps concentrically, so the bore must match the shaft — do not select an oversized bore and expect the sleeve to compensate.

An expansion sleeve distributes clamping force uniformly around the shaft circumference, which typically delivers higher torque transmission capacity and better concentricity than a single set-screw. Set-screws concentrate stress at one point and can cause shaft indentation over time. The expansion sleeve is the preferred mounting method for applications requiring precise, repeatable positioning such as CNC axes.

This pulley is designed for HTD-5M belts with a 27 mm width. Using a narrower belt (e.g., 15 mm or 20 mm) is mechanically possible but reduces the load-carrying capacity and may cause uneven belt wear. Using a wider belt is not recommended as it will overhang the tooth face. For best results, match the belt width to the 27 mm tooth width of this pulley.

The pulley body is machined from aluminum alloy, which forms a natural oxide layer that provides moderate corrosion resistance in dry and indoor environments. For outdoor or high-humidity applications, consider applying a light coating of corrosion inhibitor. Aluminum is not recommended for direct contact with strong acids or alkalis without additional surface treatment.

Yes, provided the tooth count and belt width match your existing setup. The HTD-5M tooth profile is standardized, so these pulleys are dimensionally interchangeable with other HTD-5M pulleys of the same tooth count. Verify the pitch diameter and shaft bore before installing. The expansion sleeve mounting method may differ from your original pulley's set-screw or keyway design, but the belt engagement geometry will be identical.

The pitch diameter of an HTD-5M pulley is calculated as: Pitch Diameter = (Number of Teeth × Pitch) ÷ π. For 46T: approximately 73.2 mm (2.88"). For 48T: approximately 76.4 mm (3.01"). For 50T: approximately 79.6 mm (3.13"). For 60T: approximately 95.5 mm (3.76"). Choose based on the available space in your drive assembly and the belt ratio you need.