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When a slipping or mismatched pulley brings your CNC router, 3D printer, or conveyor line to a halt, every minute of downtime costs you. Engineers, makers, and machine builders who need a reliable synchronous drive component turn to HTD-5M timing belt pulleys — a curvilinear-tooth profile designed to eliminate belt slip and maintain exact positional accuracy under load.
These pulleys feature an HTD (High Torque Drive) 5mm pitch curvilinear tooth profile machined from aluminum alloy. The tooth width is a fixed 21mm, and the bore diameter ranges from 5mm to 20mm (approximately 0.20" to 0.79"), with tooth counts spanning 10T to 72T to suit a wide range of drive ratios. Each pulley ships with a step hub for easy shaft alignment and set-screw retention.
Typical use cases include CNC axis drives requiring repeatable positioning, 3D printer X/Y gantry systems where belt tension consistency matters, and light industrial conveyor or indexing table drives. The HTD-5M profile is also widely used in robotics joint actuators and laser cutter motion stages where synchronous, backlash-free power transmission is essential.
| Belt Profile | HTD (High Torque Drive) — Curvilinear |
|---|---|
| Pitch | 5mm |
| Tooth Width | 21mm |
| Tooth Count (Number Tooth) | 10T / 12T / 14T / 15T / 16T / 18T / 20T / 22T / 24T / 25T / 28T / 30T / 32T / 36T / 40T / 44T / 48T / 50T / 60T / 72T |
| Bore Diameter Options | 5 / 6 / 6.35 / 7 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 19 / 20mm |
| Material | Aluminum Alloy |
| Hub Style | Step Hub with Set Screw Flat |
| Compatible Belt | HTD-5M Synchronous Belt, 21mm Width |
| Quantity per Order | 1 Piece |
| Weight | See variant options |
| Surface Finish | See variant options |
The tooth count determines the pulley's pitch diameter and, combined with the driven pulley's tooth count, sets your drive ratio. A smaller tooth count (e.g., 10T–16T) gives a compact pulley suited for high-speed motor shafts. A larger tooth count (e.g., 40T–72T) increases the pitch diameter, which is useful on the driven side to reduce speed and multiply torque. Calculate your required ratio by dividing the driven pulley tooth count by the drive pulley tooth count.
Match the bore diameter to your motor or shaft diameter exactly. Common stepper motor shaft sizes are 5mm and 6.35mm (1/4"). Servo motors often use 8mm, 10mm, or 12mm shafts. NEMA 23 steppers typically use 6.35mm or 8mm. If your shaft is metric, choose the matching metric bore. For imperial shafts, 6.35mm (1/4") and 12.7mm (1/2") options are available. The set screw on the step hub secures the pulley once positioned.
No. HTD-5M pulleys are designed exclusively for HTD-5M curvilinear-tooth belts with a 5mm pitch. They are not interchangeable with trapezoidal profiles such as MXL (2.032mm pitch), T5 (5mm pitch trapezoidal), or GT2/GT3 profiles. Always pair HTD-5M pulleys with HTD-5M belts of the same tooth width (21mm in this case) for correct engagement and load distribution.
These aluminum alloy pulleys are suited for light-to-medium duty synchronous drive applications such as CNC routers, 3D printers, laser cutters, and small robotics joints. The actual torque capacity depends on the tooth count, belt tension, and operating speed. For heavy industrial loads or high-shock environments, verify your torque requirements against the belt manufacturer's rated load for HTD-5M belts at 21mm width. For most hobbyist and light automation applications, these pulleys are more than adequate.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. These pulleys do not require lubrication — HTD synchronous belt drives are designed to run dry. Applying lubricant to the belt or pulley teeth can actually attract debris and accelerate wear. For humid or mildly corrosive environments, a light anodizing or clear coat treatment on the pulley surface can extend service life.
Yes. HTD-5M pulleys can be used on either the drive or driven shaft. The same pulley profile works on both sides of the belt loop. For a speed-reduction drive, use a smaller tooth count on the motor shaft and a larger tooth count on the driven shaft. For a 1:1 ratio, use identical tooth counts on both shafts. Ensure both pulleys are aligned in the same plane and that belt tension is set correctly to avoid premature wear.
The pitch diameter of an HTD-5M pulley is calculated as: Pitch Diameter (mm) = (Number of Teeth × Pitch) ÷ π. For example, a 20T pulley has a pitch diameter of (20 × 5) ÷ 3.1416 ≈ 31.83mm. A 40T pulley gives approximately 63.66mm pitch diameter. Use this to calculate belt length requirements and center distance for your drive layout.
