Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your CNC router, 3D printer, or automated conveyor keeps slipping teeth or losing position, the culprit is almost always a mismatched or worn drive pulley. Engineers and makers who demand repeatable, zero-slip motion need a pulley machined to tight tolerances — not a cast approximation. These 5M HTD timing belt drive pulleys are designed for exactly that audience: builders who refuse to compromise on positional accuracy.
Each pulley is machined from aluminium alloy and features an HTD (High Torque Drive) 5mm pitch tooth profile. The 15mm belt width (5M-15) is accommodated by the pulley's flanged body, keeping the belt tracked under load. Tooth counts range from 10 to 40 teeth, and bore sizes span 4–25mm (approximately 0.16–0.98 in), with both plain bore (Type AF / Type K) and flanged hub (Type BF) configurations available. Set-screw locking is included on applicable variants.
Typical use cases include CNC router X/Y axis drives requiring sub-millimetre repeatability, delta-style 3D printer effector carriages needing synchronised belt tension, and light-duty robotic arm joints where a 5M HTD timing belt pulley replacement is needed to restore drive accuracy. Also suited for laser engraver gantry systems and automated pick-and-place machines.
| Belt Pitch | 5mm (HTD 5M) |
|---|---|
| Belt Width Compatibility | 15mm (5M-15) |
| Tooth Count Options | 12, 15, 16, 18, 20, 22, 24, 25, 30, 40 teeth |
| Hub Type | Type AF (standard flange), Type K (keyed), Type BF (flanged hub) |
| Bore Size Range | 5–25mm plain bore; keyway variants: 12–25mm with 4–8mm keyway |
| Material | Aluminium alloy |
| Finish | Natural machined aluminium |
| Flange | Integrated side flanges for belt retention |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Set Screw | See variant options |
| Quantity per Order | 1 piece |
Tooth count determines your drive ratio when paired with a driven pulley. Divide the driven pulley tooth count by the drive pulley tooth count to get the ratio. For CNC and 3D printer applications, 20T is a common starting point for stepper motors, offering a balance between resolution and torque. Smaller tooth counts (12T–15T) increase torque at the cost of speed; larger counts (30T–40T) increase speed at the cost of torque.
Measure your motor or drive shaft diameter with a calliper before ordering. Common stepper motor shaft diameters are 5mm, 6.35mm (1/4 in), and 8mm. Servo motors often use 10mm–14mm shafts. If your shaft has a flat or keyway, select a keyway variant (e.g., 12mm + 4mm Keyway) to prevent rotational slip under load.
Type AF is a standard plain-bore flanged pulley suitable for most general motion applications where a set screw provides adequate retention. Type K features a keyed bore for positive, slip-free torque transmission on keyed shafts. Type BF has a wider, extended flange hub that provides additional shaft support and is preferred in applications with higher radial loads or where belt alignment is critical.
Aluminium alloy pulleys are well-suited for the torque levels generated by NEMA 17 and NEMA 23 stepper motors, as well as small servo motors commonly used in CNC routers, 3D printers, and light robotics. For heavy industrial drives with sustained high torque, a steel pulley may be more appropriate. If you are unsure, contact us to confirm suitability for your specific load requirements.
Yes — these pulleys are designed for standard 5M HTD timing belts with a 5mm pitch and 15mm width (5M-15). The HTD tooth profile is not interchangeable with trapezoidal (MXL, T5, T10) or GT2/GT3 profiles. Confirm your belt is labelled 5M or HTD-5M before ordering.
Plain bore variants (Type AF and Type K without keyway) are secured using a set screw that bears against the shaft. Keyway variants use a key inserted into the matching shaft keyway for positive torque transmission, with a set screw providing axial retention. Ensure the shaft surface is clean and free of burrs before installation. For keyway variants, the key must be sourced separately if not included.
Yes, with appropriate design considerations. The HTD tooth profile provides positive engagement that resists back-driving under gravity loads, making it suitable for Z-axis or vertical belt drives. Ensure the set screw or keyway is properly torqued, and consider using a locking compound on the set screw for vibration-prone environments.
