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When your CNC router, 3D printer, or stepper-motor-driven machine loses positional accuracy, the culprit is often a mismatched or worn drive pulley. Engineers and makers who demand repeatable, slip-free motion need an HTD 5M timing belt pulley that fits their exact shaft and belt width without compromise. This BF-type pulley is designed for builders who cannot afford backlash or belt skip in their motion-control builds.
Each HTD 5M timing belt pulley features a 5 mm pitch HTD tooth profile machined from aluminum alloy, with an anodized or natural finish depending on variant. Available tooth counts span 20T, 22T, and 24T, with bore diameters ranging from 5 mm to 20 mm (approximately 0.20 in to 0.79 in). Belt width compatibility covers both 15 mm and 20 mm HTD 5M belts. The BF-type hub includes a set-screw flat for positive shaft retention, and keyway bore options (3×1.4 mm, 4×1.8 mm, 5×2.3 mm) are available for keyed shaft applications.
Typical use cases include CNC router X/Y/Z axis drives requiring HTD 5M 20-tooth pulley for stepper motor, 3D printer extruder and gantry belt drive systems using 5mm pitch timing pulleys, and light industrial conveyor or indexing table automation with 24-tooth HTD pulley and 20mm belt width.
The BF-type hub design includes a machined flat and set-screw port for secure, tool-tightened shaft retention — eliminating rotational slip under load.
The rounded HTD tooth form distributes belt load across a larger contact area than trapezoidal profiles, reducing tooth shear stress and extending belt life in continuous-duty CNC and automation applications.
Select 20T for higher torque and lower speed, 22T for a balanced drive ratio, or 24T for increased surface speed — all within the same HTD 5M belt system for easy ratio tuning.
Plain round bores from 5 mm to 20 mm cover the most common stepper and servo motor shaft diameters. Keyway bore variants (3×1.4 mm, 4×1.8 mm, 5×2.3 mm) are available for positive keyed-shaft drives.
Each tooth count is offered in both 15 mm and 20 mm belt-width configurations, letting you match the pulley flange to your existing HTD 5M belt without sourcing a different belt series.
Machined from aluminum alloy for a low-inertia, corrosion-resistant drive component suited to indoor CNC, robotics, and light automation environments where weight and dimensional accuracy matter.
| Belt Profile | HTD 5M |
|---|---|
| Pitch | 5 mm |
| Tooth Count Options | 20T / 22T / 24T |
| Hub Type | BF-type (set-screw flat) |
| Bore Diameter Range | 5 mm – 20 mm (plain round); keyway options: 3×1.4 mm, 4×1.8 mm, 5×2.3 mm |
| Applicable Belt Width | 15 mm or 20 mm (see variant options) |
| Material | Aluminum alloy |
| Outer Diameter (approx.) | See variant options |
| Flange | Flanged (standard for HTD pulleys) |
| Finish | See variant options |
| Weight | See variant options |
Tooth count directly affects your drive ratio. A 20-tooth pulley paired with a given motor pulley produces more torque and less speed than a 24-tooth pulley at the same RPM. For most CNC router gantry axes, 20T is common for higher resolution; 24T suits faster travel speeds. Calculate your steps-per-mm after selecting tooth count to confirm your motion controller settings.
A plain round bore relies entirely on the set screw pressing against the shaft flat to prevent rotation. A keyway bore (e.g., 8mm with 3×1.4mm keyway) uses a matching key inserted between shaft and pulley for positive, torque-resistant engagement — recommended for higher-torque or reversing-load applications where set-screw-only retention may loosen over time.
NEMA 17 motors typically have a 5 mm shaft; select the 5 mm bore variant. NEMA 23 motors commonly use 6.35 mm (1/4 in) or 8 mm shafts — choose the matching bore. Always measure your motor shaft diameter before ordering, as shaft sizes can vary by manufacturer.
Match the pulley's belt-width specification to your existing HTD 5M belt width. A 15 mm belt requires a pulley rated for 15 mm belt width; using a 20 mm pulley with a 15 mm belt will leave the belt unguided by one flange. If you are designing a new system, 20 mm belt width provides higher load capacity for the same tooth count.
The aluminum alloy construction offers good corrosion resistance for typical indoor workshop and light industrial environments. For prolonged outdoor exposure or high-humidity conditions, consider applying a protective coating or selecting a stainless-steel alternative. The anodized finish (where applicable) improves surface corrosion resistance.
No. This pulley is machined specifically for the HTD 5M tooth profile (5 mm pitch, rounded tooth form). It is not interchangeable with T5 (trapezoidal, 5 mm pitch) or GT2 (2 mm pitch) belts. Using a mismatched belt profile will cause poor meshing, accelerated wear, and potential belt skip under load.
BF-type pulleys in this size range typically use M3 or M4 hex socket set screws (contact us to confirm for your specific bore size). You will need the corresponding hex key (Allen key) to tighten the set screw against the shaft flat. Ensure the shaft has a machined flat aligned with the set-screw port for secure retention.
