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When your motion system demands repeatable, slip-free power transfer, a mismatched or worn pulley becomes the weakest link in the chain. Engineers, CNC builders, and automation hobbyists who need a reliable HTD-8M timing belt pulley with a keyed bore will find this AF-type pulley a direct, no-compromise solution. It is designed for use with standard 8mm-pitch HTD timing belts and is available in a wide tooth count range to suit virtually any drive ratio requirement.
Each pulley features an 8mm HTD tooth pitch and a fixed pulley width of 32mm (approximately 1.26 inches). Tooth counts span from 10T to 60T, covering pitch diameters from roughly 25mm (approx. 0.98 in) up to approximately 152mm (approx. 5.98 in). Bore options range from 8mm to 38mm (approx. 0.31 to 1.50 in), and each variant ships with a matching keyway and set-screw collar for positive shaft engagement. Material is aluminum alloy (AF-type designation), offering a balance of low rotational inertia and structural rigidity.
Typical use cases include CNC router and laser-cutter axis drives requiring an HTD 8M timing pulley with keyway, 3D-printer or extruder upgrade projects needing an 8mm pitch belt pulley with bore options, and light industrial conveyor or indexing systems where an aluminum timing pulley with set-screw keyway reduces backlash and simplifies maintenance.
| Belt Pitch | 8mm (HTD profile) |
|---|---|
| Pulley Type | AF-type (aluminum, with keyway) |
| Tooth Count Range | 10T to 60T (23 options) |
| Pulley Width | 32mm (approx. 1.26 in) |
| Bore Diameter Range | 8mm to 38mm (approx. 0.31 to 1.50 in) |
| Keyway Dimensions | See variant options (3x1.4mm / 4x1.8mm / 5x2.3mm / 6x2.8mm / 8x3.3mm / 10x4mm) |
| Pitch Diameter (10T) | approx. 25.5mm (approx. 1.00 in) |
| Pitch Diameter (20T) | approx. 50.9mm (approx. 2.00 in) |
| Pitch Diameter (40T) | approx. 101.9mm (approx. 4.01 in) |
| Pitch Diameter (60T) | approx. 152.8mm (approx. 6.02 in) |
| Material | Aluminum alloy |
| Compatible Belt Width | 20mm, 30mm HTD 8M belts |
| Quantity per Order | 1 piece |
The tooth count determines the pitch diameter and, combined with your belt length and the mating pulley tooth count, sets your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the speed reduction ratio. For example, a 20T driver paired with a 40T driven pulley gives a 2:1 reduction. Use the 10T to 60T range to achieve ratios from approximately 1:6 to 6:1 in a single-stage drive.
Measure your motor or gearbox output shaft diameter with a caliper. Select the bore that matches exactly. A loose bore will cause runout and vibration even with the keyway engaged. Available bores are 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, 20, 22, 24, 25, 28, 30, 32, and 38mm. If your shaft is imperial (e.g., 0.5 in = 12.7mm), the 12.7mm bore variant is available for 20T and above.
Keyway dimensions are matched to bore size per standard DIN 6885 guidelines. The 3x1.4mm keyway is paired with 8 to 10mm bores, 4x1.8mm with 10 to 12mm bores, 5x2.3mm with 14 to 17mm bores, 6x2.8mm with 18 to 22mm bores, 8x3.3mm with 24 to 28mm bores, and 10x4mm with 30 to 38mm bores. Select the Keyway and Amount variant option to confirm the exact keyway for your chosen bore.
The aluminum alloy construction handles the torque loads typical of servo and stepper motor drives in CNC, robotics, and light industrial applications. The HTD 8M tooth profile distributes belt tension across multiple teeth simultaneously, reducing peak stress per tooth. For very high-torque or shock-load applications such as heavy conveyor drives, verify that the aluminum shear strength at the keyway cross-section meets your calculated torque requirement, or contact us to confirm suitability.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor and light-outdoor environments. For prolonged exposure to moisture, salt spray, or aggressive chemicals, consider applying an anodizing treatment or protective coating after installation. The pulley is not rated for submersion or continuous wet environments without additional surface treatment.
The 32mm pulley width is designed to work with HTD 8M timing belts in 20mm and 30mm widths. The extra pulley width beyond the belt width helps keep the belt centered on the pulley face. Using a belt wider than 30mm is not recommended as it may contact the flanges or shaft collar. Always match your belt pitch (8mm HTD) and width to the pulley specification.
No. This pulley is machined with the HTD (High Torque Drive) rounded tooth profile, which is not interchangeable with trapezoidal profiles such as T8, MXL, or GT2. Using a mismatched belt profile will cause poor meshing, accelerated wear, and potential belt skipping under load. Always pair HTD 8M pulleys with HTD 8M belts.
