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When your motion control project demands precise, slip-free power transmission, a mismatched or worn pulley can bring the whole build to a halt. Engineers, CNC builders, and robotics enthusiasts who need a reliable 8mm pitch synchronous wheel will find the HTD-8M Timing Pulley a dependable solution across a wide range of configurations.
This HTD-8M timing pulley features an 8mm tooth pitch (HTD profile) machined from aluminum alloy. Tooth counts range from 15T to 40T, teeth widths span 16mm to 32mm (~0.63" to 1.26"), and bore diameters are available from 8mm to 25mm (~0.31" to 0.98"). Each unit is sold individually (1 piece per order) unless otherwise noted in the variant selection.
Typical applications include CNC router X/Y axis drives, 3D printer extruder and motion systems, robotic arm joint actuators, conveyor and indexing mechanisms, and custom automation rigs requiring an 8mm pitch synchronous wheel with precise tooth engagement.
| Tooth Profile | HTD (High Torque Drive) |
|---|---|
| Pitch | 8mm |
| Number of Teeth | 15T / 16T / 18T / 20T / 22T / 24T / 25T / 26T / 30T / 32T / 35T / 40T |
| Teeth Width | 16mm / 21mm / 27mm / 32mm |
| Bore Diameter | 8mm / 10mm / 12mm / 12.7mm / 14mm / 15mm / 16mm / 17mm / 19mm / 20mm / 25mm (see variant options) |
| Material | Aluminum Alloy |
| Finish | See variant options |
| Quantity per Order | 1 piece |
| Compatible Belt | HTD-8M synchronous belt (match belt width to teeth width) |
| Pitch Diameter | See variant options |
| Outer Diameter | See variant options |
The tooth count determines the pitch diameter and, combined with your motor pulley, sets the drive ratio. Divide the driven pulley teeth by the drive pulley teeth to get the reduction ratio. For example, a 40T driven pulley paired with a 20T drive pulley gives a 2:1 reduction. Use a higher tooth count for larger pitch diameters or when you need to reduce belt wrap angle on the smaller pulley.
The teeth width must match (or be compatible with) your HTD-8M belt width. A wider belt and pulley combination handles higher torque loads. For light-duty CNC or 3D printer axes, 16mm or 21mm is typically sufficient. For heavier conveyor or industrial automation applications, 27mm or 32mm provides greater load capacity.
Measure your motor or shaft diameter precisely with a caliper. Select the bore option that matches your shaft. If your shaft diameter falls between listed sizes, you can bore out a smaller hole on a lathe to achieve an exact fit — do not select a bore smaller than your shaft. Common shaft sizes for NEMA 17 steppers are 5mm (not listed; requires boring) and for NEMA 23 are 6.35mm or 8mm.
The aluminum alloy construction provides a good strength-to-weight ratio suitable for most hobby CNC, 3D printing, and light industrial automation applications. The HTD-8M profile distributes belt load across the rounded tooth form, reducing stress concentrations. For very high-torque or continuous industrial duty cycles, verify the specific load requirements against the pulley's rated capacity for your chosen width.
This pulley follows the standard HTD-8M tooth geometry, so it is compatible with any HTD-8M synchronous belt from any manufacturer, provided the belt width matches the pulley teeth width you select. The HTD profile is an industry-standard specification, not a proprietary design.
Set screw and keyway availability varies by variant. Please check the product images and variant description for your selected configuration. If your application requires a specific retention method (set screw, keyway, or clamping hub), confirm this detail before ordering or contact us to confirm.
HTD-8M timing pulleys can be used in vertical load applications when paired with an appropriate belt and tensioning system. Ensure the belt tension is correctly set to prevent back-driving under load. For safety-critical lifting applications, always include a mechanical brake or anti-back-drive mechanism independent of the belt drive.
