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When a slipping or mismatched pulley throws off your motion system, every axis suffers — and so does your project. Engineers, makers, and automation builders who demand repeatable, zero-backlash power transmission need a pulley they can count on. These HTD-3M timing belt pulleys are machined to the HTD (High Torque Drive) 3mm pitch standard, delivering the tooth engagement accuracy that synchronous drive systems require.
Each pulley is machined from aluminum alloy, featuring a 16mm belt-contact width and a flanged profile to keep the belt tracking true. The tooth count spans 14T to 120T, and bore diameters range from 4mm to 20mm (approximately 0.16 in to 0.79 in), covering a wide range of motor shaft sizes. The HTD-3M tooth profile provides deeper engagement than MXL or GT2 profiles, making it well-suited for higher-torque applications.
Typical use cases include CNC router and laser cutter axis drives, 3D printer extruder and motion systems, robotic arm joint actuators, and custom conveyor or indexing mechanisms where precise belt-to-pulley synchronization is critical.
| Belt Pitch | 3mm (HTD-3M) |
|---|---|
| Tooth Count | 14T – 120T (see variant options) |
| Bore Diameter | 4 / 5 / 6 / 6.35 / 8 / 10 / 12 / 14 / 15 / 16 / 17 / 19 / 20mm (see variant options) |
| Belt Width (Pulley) | 16mm |
| Tooth Profile | HTD (High Torque Drive) |
| Material | Aluminum alloy |
| Flange | Double-flanged |
| Shaft Retention | See variant options |
| Compatible Belt | HTD-3M timing belt, 15–16mm width |
| Quantity per Order | 1 piece |
The tooth count determines the pulley's pitch diameter and, combined with your belt length and center distance, sets your gear ratio. For CNC and 3D printer axes, 20T is a common starting point for direct-drive configurations. Larger tooth counts (40T–120T) are used on driven pulleys to reduce speed and increase torque. Calculate your required ratio first, then select the driver and driven tooth counts accordingly.
Measure your motor or drive shaft diameter with calipers before ordering. Common stepper motor shaft sizes are 5mm and 6.35mm (1/4 inch); servo motors often use 8mm, 10mm, or larger. Select the bore that matches your shaft exactly — a bore that is too large will cause runout and belt skip.
No. This pulley uses the HTD-3M tooth profile, which has a rounded, deeper tooth form. It is not interchangeable with GT2 (2mm pitch) or MXL (0.08 inch pitch) belts. Always pair HTD-3M pulleys with HTD-3M belts of matching pitch and compatible width.
The pulley's belt contact surface is 16mm wide. It is designed for HTD-3M belts with a 15mm or 16mm width. Using a narrower belt is possible but reduces load capacity; a wider belt will not seat correctly between the flanges.
Aluminum alloy pulleys are suitable for the majority of CNC, 3D printing, and light-to-medium automation applications. They offer a favorable strength-to-weight ratio and resist corrosion without surface treatment. For very high torque or heavy industrial duty cycles, steel pulleys may be preferred, but for most maker and engineering applications aluminum performs reliably.
Shaft retention method varies by variant. Please check the variant description or contact us to confirm whether your selected size includes a set screw, keyway, or smooth bore. In general, smaller bore sizes (4–8mm) typically use set screws, while larger bores may offer keyway options.
Most consumer 3D printers use GT2 2mm pitch belts, not HTD-3M. However, some custom and industrial 3D printer builds do use HTD-3M drive systems. Verify your printer's belt pitch before ordering. If your printer uses HTD-3M belts and requires a 16mm-wide pulley, this product is compatible.
