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When your CNC router, 3D printer, or automation system demands slip-free, synchronized motion, a mismatched or worn pulley becomes the weakest link in the entire drive train. Engineers and makers who rely on HTD-8M timing belt pulleys need a component that holds tight tolerances across every cycle. This HTD-8M timing belt pulley is designed for builders, integrators, and repair technicians who cannot afford positional drift or belt skip in their motion-control systems.
Each pulley is machined from aluminum alloy with an anodized finish, featuring an 8mm pitch HTD tooth profile. Available tooth counts span 15, 16, 20, 24, 25, and 30 teeth. Belt widths range from 15mm to 40mm (approximately 0.59 in to 1.57 in), and bore diameters range from 5mm to 25mm (approximately 0.20 in to 0.98 in). Both toothed (drive) and smooth (idler) variants are offered, allowing you to configure complete belt drive assemblies from a single source.
Typical applications include CNC router X/Y axis drives, laser engraver gantry systems, 3D printer extruder and motion stages, conveyor indexing mechanisms, and robotic joint actuators requiring repeatable positioning with HTD-8M timing belts.
| Belt Pitch | 8mm (HTD-8M) |
|---|---|
| Tooth Profile | HTD (High Torque Drive) |
| Available Tooth Counts | 15, 16, 20, 24, 25, 30 |
| Belt Width Options | 15mm, 20mm, 25mm, 30mm, 40mm |
| Bore Diameter Options | 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 15mm, 20mm, 25mm |
| Tooth Style | With Tooth (drive) / Without Tooth (smooth idler) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Pitch Diameter | See variant options |
| Flange | See variant options |
| Set Screw | See variant options |
Tooth count determines the pitch diameter of the pulley, which directly affects your drive ratio and belt speed. A 15-tooth pulley has a smaller pitch diameter than a 30-tooth pulley. To calculate your drive ratio, divide the driven pulley tooth count by the driving pulley tooth count. For most CNC and robotics applications, match the tooth count to your existing belt drive design or motion controller steps-per-mm calculation.
The "With Tooth" variant is a standard drive pulley with HTD-8M tooth profile that positively engages the timing belt teeth, transmitting torque without slip. The "Without Tooth" (smooth) variant is an idler pulley used to tension the belt, change its direction, or support it along a span — it does not engage the belt teeth and rotates freely against the belt's flat back surface.
The bore diameter must match your shaft diameter. Measure your shaft with a caliper and select the bore option that matches exactly. Available bores range from 5mm to 25mm. If your shaft diameter falls between available sizes, you can bore out a smaller option on a lathe, but you cannot reduce a bore that is already too large. When in doubt, order the next size down and have it machined to fit.
The belt width option you select must match the width of your HTD-8M timing belt. Using a belt narrower than the pulley width is acceptable but reduces load capacity. Using a belt wider than the pulley is not recommended as the belt edges will overhang and may cause tracking issues or premature wear. Available belt widths are 15mm, 20mm, 25mm, 30mm, and 40mm.
Yes — this pulley is designed to the HTD-8M standard (8mm pitch, HTD tooth profile) and is compatible with any HTD-8M timing belt of the matching width. It is not compatible with T8, GT2, or other pitch/profile belts. Confirm your belt is labeled HTD-8M or 8M before ordering.
The pulley bore is machined to close tolerances for a snug shaft fit. Securing method depends on the variant — typically a set screw is used to clamp the pulley to the shaft. For high-torque applications, a keyway shaft and matching keyway bore provide a more positive lock. Check the variant specifications or contact us to confirm the securing method for your selected bore size.
Yes. Select the "Without Tooth" (smooth) variant for use as a tensioner or idler. Mount it on a bearing or fixed shaft at the appropriate position in your belt path to maintain belt tension or redirect the belt. The smooth surface contacts the back of the timing belt without engaging the teeth, which is the correct configuration for an idler or tensioner role.
