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When your motion control project demands repeatable, slip-free synchronization, a mismatched or worn pulley is the first point of failure. Engineers, CNC builders, and robotics hobbyists who need a reliable HTD-5M timing belt pulley will find this AF-type drive pulley engineered to deliver consistent torque transfer across a wide range of shaft sizes and tooth counts.
Each pulley is CNC-machined from 45# carbon steel and features an HTD (High Torque Drive) 5mm pitch tooth profile. The belt-contact width is 16mm, with tooth counts ranging from 10T to 60T and bore diameters from 5mm to 28mm (approximately 0.20" to 1.10"). The AF-type hub design includes a set-screw flat for secure shaft locking without keyways.
Typical applications include 3D printer X/Y axis drives, CNC router spindle synchronization, conveyor belt tensioning systems, and DIY servo-driven linear actuators — all scenarios where an HTD 5M timing pulley with a precise bore-to-shaft fit is critical for positional accuracy.
Machined from 45# medium-carbon steel for a balance of machinability and load-bearing strength, suitable for continuous-duty drive applications.
The rounded HTD tooth form distributes belt load across a larger contact area, reducing tooth shear stress compared to trapezoidal MXL/XL profiles.
Choose from 20 tooth-count options to dial in your exact drive ratio — from compact 10T sprockets for tight center distances to 60T for high-reduction stages.
The AF-type bore includes a machined flat and set-screw tapped hole, allowing secure shaft locking on smooth shafts without requiring a keyway.
The 16mm tooth width is compatible with standard 15mm and 16mm wide HTD-5M belts, providing a stable tracking surface and even load distribution.
Each pulley is turned and milled on CNC equipment to maintain consistent pitch diameter, bore concentricity, and tooth spacing for smooth, low-vibration operation.
| Belt Pitch | 5mm (HTD-5M) |
|---|---|
| Tooth Profile | HTD (High Torque Drive), rounded |
| Number of Teeth | 10T, 12T, 14T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 34T, 36T, 38T, 40T, 50T, 60T |
| Belt Width (Tooth Width) | 16mm |
| Bore Diameter | 5mm – 28mm (see variant options) |
| Hub Type | AF-type (set-screw flat, no keyway) |
| Material | 45# Carbon Steel |
| Surface Finish | See variant options |
| Pitch Diameter | See variant options (varies by tooth count) |
| Compatible Belt Width | 15mm – 16mm HTD-5M synchronous belt |
| Quantity per Order | 1 piece |
The tooth count determines the pitch diameter and, combined with your mating pulley, sets the drive ratio. Divide the driven pulley teeth by the driver pulley teeth to get the reduction ratio. For example, a 10T driver paired with a 30T driven pulley gives a 3:1 reduction. Use a smaller tooth count for higher speed output and a larger tooth count for more torque.
Select the bore that matches your shaft diameter exactly. Available bores range from 5mm to 28mm. The AF-type hub uses a set-screw against a machined flat on the shaft — ensure your shaft has a flat ground or milled at the set-screw location for a secure, non-slip connection. Common motor shaft sizes include 5mm, 6mm, 6.35mm (1/4"), 8mm, 10mm, and 12mm.
Yes. This pulley is designed for HTD-5M synchronous timing belts with a 5mm pitch and a 15mm or 16mm belt width. It is not compatible with GT2, MXL, XL, or other pitch profiles. Always verify the pitch and width of your existing belt before ordering.
45# carbon steel (equivalent to SAE 1045) has a tensile strength of approximately 600–700 MPa in its normalized state, making it suitable for moderate-to-heavy duty power transmission. For most CNC, 3D printing, and light industrial applications, this material provides adequate strength. For very high-torque or high-speed applications, consult a mechanical engineer to verify the design load against the pulley's rated capacity.
45# carbon steel is not inherently corrosion-resistant. For indoor, dry environments (typical of CNC machines and 3D printers), surface oxidation is minimal under normal use. If your application involves moisture, coolant mist, or outdoor exposure, consider applying a light machine oil coating or selecting a stainless steel alternative. Contact us if you need a corrosion-resistant variant.
Yes. The AF-type hub is designed for keyway-free installation. It uses a set-screw that presses against a flat on the shaft. This is suitable for most light-to-medium torque applications. If your application involves very high torque or frequent direction reversals, a keyed shaft connection may provide more reliable torque transfer — contact us to discuss options.
HTD-5M uses a 5mm pitch with a rounded (curvilinear) tooth profile optimized for high torque transmission. GT2 (Gates Tooth 2) also uses a curvilinear profile but with a 2mm pitch, making it more common in low-torque, high-precision applications like 3D printer extruder drives. These two profiles are not interchangeable — always match the pulley tooth profile to your belt.
