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Engineers, makers, and machine builders often struggle to find HTD-5M timing belt pulleys that combine accurate tooth profiles with a reliable bore-and-keyway fit — especially when sourcing across a wide tooth count range. These HTD-5M timing belt pulleys are designed for builders who need consistent, repeatable power transmission without slippage or backlash in demanding drive systems.
Each pulley is machined from 45# carbon steel and features an HTD (High Torque Drive) 5mm pitch tooth profile. The belt contact width is 27mm, and the BF (flanged, bored) hub configuration accepts a finished bore with a matching keyway. Tooth counts range from 15T to 72T, with bore diameters spanning 8mm to 30mm (approximately 0.31 in to 1.18 in) and keyway dimensions from 3×1.4mm up to 8×3.3mm depending on bore size.
Typical use cases include CNC router X/Y axis drives, 3D printer extruder and motion systems, robotic arm joint actuators, conveyor indexing mechanisms, and custom automation equipment requiring a 5mm HTD belt drive with a keyed shaft connection.
| Belt Pitch | 5mm (HTD-5M) |
|---|---|
| Tooth Profile | HTD (High Torque Drive), rounded |
| Number of Teeth | 15T, 16T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 34T, 36T, 38T, 40T, 44T, 48T, 50T, 60T, 72T |
| Belt Width (C dimension) | 27mm (1.06 in) |
| Hub Type | BF — Flanged, finished bore with keyway |
| Material | 45# carbon steel |
| Bore Diameter Range | 8mm – 30mm (0.31 in – 1.18 in); see variant options |
| Keyway Dimensions | 3×1.4mm / 4×1.8mm / 5×2.3mm / 6×2.8mm / 8×3.3mm (varies by bore) |
| Pitch Diameter (15T) | Approx. 23.87mm (0.94 in) |
| Pitch Diameter (30T) | Approx. 47.75mm (1.88 in) |
| Pitch Diameter (60T) | Approx. 95.49mm (3.76 in) |
| Pitch Diameter (72T) | Approx. 114.59mm (4.51 in) |
| Quantity per Order | 1 piece |
| Surface Finish | See variant options |
| Weight | See variant options |
The tooth count determines the pitch diameter and, combined with your mating pulley's tooth count, sets the drive ratio. For a 2:1 speed reduction, pair a 15T drive pulley with a 30T driven pulley. For a 1:1 ratio (same speed), use matching tooth counts on both pulleys. Calculate pitch diameter using: PD = (Teeth × Pitch) ÷ π. For example, a 20T pulley has a pitch diameter of (20 × 5) ÷ π ≈ 31.83mm.
Match the bore diameter to your shaft's outer diameter. The keyway dimensions are standardized per bore size following common metric key standards — for example, an 8mm bore uses a 3×1.4mm keyway, while a 20mm bore uses a 6×2.8mm keyway. Select the variant that matches both your shaft diameter and the key size already cut on your shaft, or plan to cut a matching keyway slot.
These pulleys are designed for HTD-5M timing belts with a 27mm (approximately 1.06 in) width. Using a narrower belt is possible but reduces load capacity and may cause belt tracking issues. Using a wider belt is not recommended as it will overhang the pulley flanges. Always match belt width to the pulley's C dimension for reliable operation.
Yes. The 45# carbon steel construction and HTD tooth profile make these suitable for CNC router X/Y/Z axis drives and 3D printer motion systems. The HTD profile distributes belt load more evenly than trapezoidal profiles, reducing the risk of tooth skipping under acceleration. For high-speed, low-torque applications, smaller tooth counts (15T–20T) are common. For higher-torque, lower-speed applications, larger tooth counts or a reduction pair are typical.
BF indicates the pulley has both a finished bore (B) and flanges (F) on both sides of the belt groove. The flanges help retain the belt laterally, preventing it from walking off the pulley during operation. A "B" type has a finished bore but no flanges; an "F" type has flanges but may require a separate hub or set screw mounting. BF is the most common configuration for direct shaft mounting in maker and automation applications.
45# carbon steel is not inherently corrosion-resistant. In humid or wet environments, surface oxidation can occur over time. For indoor CNC or automation use in a typical workshop environment, the pulleys will perform reliably without additional treatment. For environments with moisture exposure, applying a light machine oil or anti-rust coating to non-contact surfaces is recommended.
The bore diameters listed are metric. Some metric bores are close to common imperial shaft sizes — for example, a 12.7mm bore corresponds to a 1/2 inch shaft. If your shaft is imperial, select the 12.7mm bore variant where available (listed for 32T and larger tooth counts). For other imperial sizes, verify the metric bore is within acceptable tolerance of your shaft diameter before ordering.
