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When your CNC router skips steps, your 3D printer loses registration, or your automation rig slips under load, the culprit is almost always a mismatched or worn drive pulley. Engineers, hobbyists, and machine builders who need repeatable, slip-free motion rely on HTD-5M timing belt pulleys to keep every axis locked in sync. These BF-type pulleys are designed for anyone building or repairing synchronous drive systems — from desktop fabrication machines to industrial conveyor stages.
Each HTD-5M timing belt pulley features a 5 mm pitch HTD tooth profile machined from aluminum alloy, with a 16 mm belt width and a flanged BF-type hub. Available tooth counts span 46T, 48T, 50T, 60T, 72T, and 75T, with outer diameters ranging from approximately 73 mm (≈2.87 in) for the 46T up to approximately 119 mm (≈4.69 in) for the 75T. Bore options cover 5 mm through 28 mm (≈0.20–1.10 in) depending on tooth count, with a set-screw clamping style for secure shaft retention.
Typical use cases include CNC router X/Y axis drives requiring HTD 5M pulley replacements, 3D printer extruder and gantry synchronous belt systems, and light-duty robotics or conveyor automation where a reliable 5mm pitch timing pulley with selectable bore is essential for repeatable positioning.
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 applications.
Six tooth counts — 46T, 48T, 50T, 60T, 72T, and 75T — let you dial in the exact gear ratio your drive system needs without resorting to custom machining or adapter plates.
The BF-type hub includes dual flanges that keep the belt tracking centered on the pulley face, preventing lateral drift during high-speed or reversing-direction operation.
Bore sizes from 5 mm to 28 mm accommodate a broad range of motor and shaft diameters — from small stepper motor shafts to larger servo and gearbox output shafts — secured by a set screw.
Machined from aluminum alloy, these pulleys offer a favorable strength-to-weight ratio that reduces rotational inertia, making them well-suited for rapid-acceleration CNC and robotics applications.
All variants share a consistent 16 mm belt contact width, so you can swap tooth counts within the same machine frame without changing belt width or pulley alignment hardware.
| Belt Pitch | 5 mm (HTD profile) |
|---|---|
| Belt Width | 16 mm |
| Tooth Count Options | 46T / 48T / 50T / 60T / 72T / 75T |
| Bore Range | 5 mm – 28 mm (varies by tooth count; see variant options) |
| Hub Type | BF-type (dual flange) |
| Shaft Retention | Set screw |
| Material | Aluminum alloy |
| Outer Diameter | See variant options |
| Pitch Diameter | See variant options |
| Finish | Natural anodized / machined |
| Quantity per Order | 1 piece |
Tooth count determines the pitch diameter and, combined with your motor pulley tooth count, sets your drive ratio. Smaller tooth counts (46T–50T) give a more compact pulley with higher belt wrap angle on short center distances. Larger counts (60T–75T) suit applications needing a speed reduction or a larger pitch diameter to reduce belt tension. Calculate your required ratio first, then select the tooth count that achieves it within your frame constraints.
Measure your motor or shaft diameter with a caliper before ordering. The bore must match the shaft diameter exactly — a bore that is too large will cause runout even with the set screw tightened. Available bores range from 5 mm to 28 mm depending on the tooth count selected. Check the variant options for the specific bore sizes available for your chosen tooth count.
Yes. These pulleys are machined to the HTD-5M tooth profile standard (5 mm pitch, rounded tooth form) and are compatible with any HTD-5M synchronous timing belt with a 16 mm width. They are not compatible with MXL, T5, GT2, or other pitch profiles — always verify the belt pitch before ordering.
BF-type pulleys have flanges on both sides of the belt contact surface, which actively guides the belt and prevents it from walking off the pulley during operation. B-type pulleys have a flange on one side only. For most CNC and robotics applications where the belt may experience lateral forces or the drive is not perfectly aligned, BF-type is the recommended choice.
The set screw provides adequate clamping for typical CNC, 3D printer, and light automation loads when properly torqued against a flat or keyway on the shaft. For high-torque or shock-load applications, we recommend using a shaft with a machined flat to give the set screw a positive seat. If your application involves very high torque, consider a keyed bore variant or a shaft collar as a secondary retention method.
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 corrosive chemicals, applying a light coating of machine oil or using an anodized variant is advisable. These pulleys are not rated for submersion or continuous wet environments.
All variants in this listing are designed for 16 mm wide HTD-5M timing belts. Using a narrower belt (e.g., 10 mm or 15 mm) is possible but reduces load capacity and may cause uneven wear. Using a wider belt is not recommended as it will overhang the pulley flanges and risk damage to the belt edge.
For HTD-5M pulleys, the pitch diameter (PD) = (Number of Teeth × Pitch) ÷ π. For example, a 46T pulley has a PD of approximately 73.2 mm. The outer diameter is slightly smaller than the pitch diameter due to the HTD tooth geometry. Exact outer diameter values are listed in the variant specifications or can be calculated using standard HTD pulley geometry formulas.
