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When your motion control system demands repeatable, slip-free power transmission, a mismatched or worn pulley becomes the weakest link in the chain. Engineers, makers, and CNC builders who need a reliable HTD-5M timing belt pulley with a keyed bore will find this series covers the full range of common shaft sizes and tooth counts in a single listing.
Each pulley is machined from 45# carbon steel and features an HTD (High Torque Drive) tooth profile with a 5mm pitch and a 16mm belt-width groove. Tooth counts span 16 T to 60 T, bore diameters run from 8 mm (0.31 in) to 28 mm (1.10 in), and keyway dimensions range from 3×1.4 mm up to 8×3.3 mm depending on the bore selected — all per standard DIN 6885 keyway sizing.
Typical use cases include desktop CNC router X/Y axes, 3D printer extruder and motion stages, robotic arm joint drives, conveyor indexing systems, and any closed-loop servo or stepper application where an HTD-5M timing belt pulley with keyway is required for positive shaft locking.
Machined from medium-carbon 45# steel for solid rigidity and resistance to deformation under cyclic belt tension loads.
Rounded HTD tooth form distributes load across a larger contact area than trapezoidal profiles, reducing tooth shear stress at higher torque.
Covers common gear-ratio requirements from compact 16-tooth drive pulleys to large 60-tooth driven pulleys in a single product family.
Each pulley ships with a machined keyway (3×1.4 mm to 8×3.3 mm) that eliminates rotational slip under shock loads — no set-screw-only dependency.
Bore options from 8 mm to 28 mm accommodate NEMA stepper shafts, servo motor shafts, and standard metric shaft stock without custom boring.
The 16mm-wide tooth groove accepts standard HTD-5M belts in 15mm and 16mm widths, providing lateral belt retention and reducing edge wear.
| Belt Type | HTD-5M (High Torque Drive) |
|---|---|
| Pitch | 5 mm (0.197 in) |
| Belt Width (groove) | 16 mm (0.63 in) |
| Number of Teeth | 16 T to 60 T (see variant options) |
| Bore Diameter | 8 mm to 28 mm (see variant options) |
| Keyway Dimensions | 3×1.4 mm / 4×1.8 mm / 5×2.3 mm / 6×2.8 mm / 8×3.3 mm (matched to bore) |
| Material | 45# Carbon Steel |
| Pitch Circle Diameter (16T) | ≈ 25.46 mm (1.00 in) |
| Pitch Circle Diameter (60T) | ≈ 95.49 mm (3.76 in) |
| Quantity per Order | 1 piece |
| Surface Finish | See variant options |
The tooth count determines the pitch circle diameter (PCD = Teeth × Pitch ÷ π). For a given center distance and speed ratio, select the driven-to-drive tooth ratio that matches your required RPM reduction or increase. Common CNC setups use a 20T drive and 40T driven pulley for a 2:1 reduction. Use a belt-length calculator with your chosen tooth counts and center distance to confirm the correct belt length.
NEMA 23 stepper motors typically have a 6.35 mm (1/4 in) or 8 mm output shaft. Select the 8 mm bore with the 3×1.4 mm keyway option. If your motor has a 6.35 mm shaft, you will need a bushing or select a supplier that offers that bore — the 8 mm bore is the closest standard option in this series.
Keyway dimensions follow standard DIN 6885 sizing matched to the bore: 8–10 mm bore → 3×1.4 mm keyway; 12–12.7 mm bore → 4×1.8 mm keyway; 14–17 mm bore → 5×2.3 mm keyway; 18–22 mm bore → 6×2.8 mm keyway; 24–28 mm bore → 8×3.3 mm keyway. The keyway option is shown in the variant selector as "Keyway & Amount."
45# carbon steel (equivalent to C45 / AISI 1045) has a tensile strength of approximately 600–800 MPa in the normalized condition, making it suitable for moderate-to-high torque belt drive applications. For extreme shock loads or corrosive environments, consider whether a surface treatment is needed — contact us to confirm finish options for your application.
Yes. The tooth profile is machined to the HTD-5M standard with a 5 mm pitch and a rounded tooth form. It is compatible with any HTD-5M open-end or closed-loop timing belt with a 15 mm or 16 mm width. Do not use with MXL, T5, GT2, or other non-HTD-5M belt profiles — the tooth geometry is not interchangeable.
The bore is machined with a keyway slot, but you are not required to use a key. A set screw can be used alone for light-duty or low-shock applications. However, for reliable torque transmission under dynamic or reversing loads, using a key is strongly recommended to prevent rotational slip between the shaft and pulley hub.
Use the standard belt-length formula: L = 2C + π(D₂ + D₁)/2 + (D₂ − D₁)²/(4C), where C is center distance, D₁ is the smaller pulley PCD, and D₂ is the larger pulley PCD. PCD = (Teeth × 5) ÷ π. Round up to the nearest available belt tooth count. Many online HTD belt calculators can automate this calculation.
