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 automation rig demands slip-free, repeatable motion, a loose or mismatched pulley is the last thing you need. These HTD-8M timing belt pulleys are engineered for makers, machine builders, and engineers who need a reliable, keyed drive wheel that locks onto the shaft and stays there — no slipping, no guessing.
Each pulley is machined from aluminum alloy with a natural or anodized finish. The belt-contact surface follows the HTD (High Torque Drive) 8mm pitch profile, and the hub width is 16mm (approximately 0.63 in). Bore sizes range from 8mm to 30mm (approx. 0.31–1.18 in), with tooth counts from 10T to 30T to suit a wide range of drive ratios. Each unit ships with a matching keyway slot pre-machined to DIN 6885 standard dimensions.
Typical use cases include CNC gantry drives requiring an HTD 8M pulley with keyway, 3D printer Z-axis or extruder drive upgrades, robotic arm joint actuators needing a keyed timing pulley 8mm pitch, and industrial conveyor or indexing table synchronization systems.
| Belt Pitch | 8mm (HTD-8M profile) |
|---|---|
| Tooth Count Options | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T |
| Belt Face Width | 16mm (≈0.63 in) |
| Bore Diameter Range | 8mm – 30mm (0.31–1.18 in) |
| Keyway Dimensions | See variant options (3×1.4mm / 4×1.8mm / 5×2.3mm / 6×2.8mm / 8×3.3mm) |
| Keyway Standard | DIN 6885 |
| Material | Aluminum alloy |
| Finish | Natural / anodized (see variant options) |
| Quantity per Order | 1 piece |
| Compatible Belt Type | HTD-8M open-end or closed-loop timing belt |
| Pitch Diameter (10T) | approx. 25.46mm (1.00 in) |
| Pitch Diameter (20T) | approx. 50.93mm (2.01 in) |
| Pitch Diameter (30T) | approx. 76.39mm (3.01 in) |
The tooth count determines the pitch diameter and, combined with your driven pulley's tooth count, sets your drive ratio. For higher speed with lower torque, use a smaller driving pulley (fewer teeth). For higher torque at lower speed, use a larger driving pulley (more teeth). Common CNC gantry setups use 20T–30T on the motor side paired with a matching belt length.
Measure your motor or drive shaft diameter with a caliper. Select the bore that matches exactly — for example, a NEMA 23 stepper typically has a 6.35mm or 8mm shaft, while servo motors often use 10mm, 12mm, or 14mm shafts. The keyway slot is pre-machined to match the bore, so no additional machining is needed for standard shaft sizes.
Keyway dimensions follow DIN 6885 standards and scale with bore size: 8mm bore uses a 3×1.4mm key, 10–12mm bore uses 3×1.4mm or 4×1.8mm, 14–17mm bore uses 5×2.3mm, 19–22mm bore uses 6×2.8mm, and 24–30mm bore uses 8×3.3mm. The exact keyway for your selected variant is shown in the "Keyway & Amount" option.
Yes — this pulley is designed for the standard HTD-8M tooth profile with 8mm pitch. It is compatible with any open-end or closed-loop HTD-8M timing belt. Ensure your belt width is 16mm or narrower to match the pulley face width. Belts wider than 16mm will overhang the pulley flanges and may cause tracking issues.
Aluminum alloy pulleys are well-suited for the torque levels typical of CNC routers, 3D printers, and light-to-medium industrial automation. The HTD tooth profile distributes load across multiple teeth simultaneously, reducing stress concentration. For very high-torque or heavy industrial applications (e.g., large servo drives above 5 Nm continuous), consider verifying the pulley's rated load against your system requirements.
Aluminum alloy naturally forms a thin oxide layer that resists corrosion in typical indoor workshop environments. Anodized variants offer additional surface hardness and corrosion resistance. Avoid prolonged exposure to strong acids, alkalis, or salt spray. For outdoor or high-humidity environments, periodic inspection is recommended.
The pulley includes a pre-machined keyway slot, but you can use it with a set screw alone if your shaft does not have a keyway cut. However, for applications with reversing loads or high torque, using a key is strongly recommended to prevent shaft rotation relative to the pulley hub.
For a typical CNC router using an 8M belt, a 20T pulley on a NEMA 23 motor gives a pitch diameter of ~50.9mm, resulting in approximately 160mm of linear travel per motor revolution — a common starting point. Fewer teeth (e.g., 10T–14T) give finer resolution but less speed; more teeth (e.g., 24T–30T) give faster travel but require more motor torque. Match your belt loop length and axis travel requirements when selecting tooth count.
