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When a slipping or mismatched pulley causes your CNC router, 3D printer, or automation rig to lose steps, the entire project suffers. Engineers, makers, and machine builders who need repeatable, zero-slip power transmission rely on a correctly specified HTD-5M timing belt pulley to keep every axis in sync.
This synchronous wheel is machined to the HTD-5M profile with a 5mm pitch and is available in tooth counts from 10T to 28T, tooth widths of 16mm (~0.63 in) or 21mm (~0.83 in), and bore diameters ranging from 5mm to 20mm (~0.20–0.79 in). The hub accepts a set-screw for secure shaft retention.
Typical applications include CNC router X/Y axis drives where an HTD-5M synchronous pulley ensures accurate positioning, desktop 3D printer extruder and motion systems requiring a 5mm pitch timing pulley, and light-duty robotic arm joints or conveyor drives where a compact synchronous wheel with selectable bore fits a range of motor shafts.
| Belt Profile | HTD-5M |
|---|---|
| Pitch | 5mm (0.197 in) |
| Tooth Count Options | 10T, 12T, 14T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 28T |
| Tooth Width Options | 16mm (0.63 in) / 21mm (0.83 in) |
| Bore Diameter Options | 5, 6, 6.35, 7, 8, 10, 12, 12.7, 14, 15, 16, 17, 19, 20mm |
| Material | Aluminium alloy |
| Shaft Retention | Set-screw hub |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Finish | Natural / anodised aluminium |
| Quantity | 1 piece per order |
The tooth count determines the pulley's pitch diameter and, combined with the driven pulley's tooth count, sets your drive ratio. For CNC and 3D printer axes, 16T–20T pulleys are common on the motor side. Larger tooth counts (24T–28T) increase belt contact and reduce tooth load, which is useful in higher-torque applications. Match the tooth count to your required speed ratio and available belt length.
Measure your motor shaft diameter precisely with calipers. Common stepper motor shaft sizes are 5mm and 6.35mm (1/4 in); servo motors often use 6mm, 8mm, or larger shafts. Select the bore that matches your shaft — a bore that is too large will not grip securely even with a set-screw. If your shaft is between listed sizes, choose the next size down and bore it out, or contact us to confirm availability.
Tooth width must match or exceed your belt width. A 16mm-wide pulley is used with belts up to 15mm wide (e.g., standard 10mm or 15mm HTD-5M belts), while the 21mm option accommodates wider belts up to 20mm. A wider tooth also increases the contact area, which can improve load distribution in higher-torque drives.
No. This pulley is specifically machined to the HTD-5M tooth profile with a 5mm pitch. The HTD tooth form is a rounded, curvilinear profile that is not interchangeable with GT2 (2mm pitch), T5 (5mm pitch, trapezoidal), or other belt profiles. Always pair this pulley with an HTD-5M belt to ensure correct meshing and avoid premature wear.
The set-screw provides adequate retention for typical CNC, 3D printing, and light automation loads when properly tightened against a flat or keyway on the shaft. For high-torque or reversing-load applications, consider using a shaft with a flat ground to the set-screw, or applying a thread-locking compound to the set-screw. If your application involves heavy shock loads, a keyed bore variant may be more appropriate.
Aluminium alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in dry indoor environments — suitable for most CNC machines, 3D printers, and robotics. For humid, outdoor, or chemically exposed environments, an anodised finish (where available) or periodic light lubrication of the belt interface is recommended. Avoid prolonged contact with salt water or strong acids.
Yes. You can use two pulleys from this range — one on the motor shaft and one on the driven shaft — as long as both share the same HTD-5M belt profile and tooth width. Using different tooth counts between driver and driven pulleys creates a speed/torque ratio. Using identical tooth counts gives a 1:1 ratio. Ensure the belt length is calculated to suit the centre distance between the two pulleys.
