Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a slipping or mismatched pulley brings your CNC router, 3D printer, or automation rig to a halt, the cost is more than downtime — it's lost precision and wasted material. Engineers, makers, and machine builders who demand repeatable accuracy rely on HTD-5M timing belt pulleys to keep every axis synchronized and every cycle consistent.
These HTD-5M timing belt pulleys are machined from 45# carbon steel and feature a 5mm pitch HTD tooth profile with a 16mm belt width (B-type flange). Tooth counts range from 15T to 72T, bore diameters span 8mm to 30mm (approximately 0.31" to 1.18"), and keyway dimensions match standard DIN 6885 sizes — from 3×1.4mm up to 8×3.3mm — ensuring a secure, torque-transmitting fit on motor shafts and drive axles.
Typical applications include CNC router X/Y/Z axis drives, desktop 3D printer extruder and motion systems, laser engraver gantry drives, conveyor and indexing automation, and robotics joint actuators requiring low-backlash synchronous drive.
| Belt Profile | HTD-5M (5mm pitch, rounded tooth) |
|---|---|
| Belt Width | 16mm (B-type flange) |
| Tooth Count | 15T – 72T (see variant options) |
| Pitch Diameter Range | ~23.87mm – ~114.59mm (0.94" – 4.51") |
| Bore Diameter | 8mm – 30mm (see variant options) |
| Keyway Dimensions | 3×1.4mm / 4×1.8mm / 5×2.3mm / 6×2.8mm / 8×3.3mm (see variant options) |
| Material | 45# carbon steel |
| Finish | See variant options |
| Flange Type | B-type (double flange) |
| Quantity per Order | 1 piece |
The tooth count determines the pitch diameter and, combined with your mating pulley, sets the drive ratio. For CNC and 3D printer axes, common pairings are 20T driver with 20T driven (1:1) for direct drive, or 20T with 40T for a 2:1 reduction. Calculate pitch diameter as: PD = (Teeth × Pitch) ÷ π. Select the combination that achieves your target linear speed or torque at the motor's rated RPM.
Measure your motor or drive shaft diameter with a caliper. Choose the bore that matches your shaft — a bore slightly larger than the shaft is normal; the keyway and set screw (or interference fit) provide the torque lock. Keyway size follows DIN 6885 standards: 8–10mm bore typically uses 3×1.4mm, 12–14mm uses 4×1.8mm, 15–17mm uses 5×2.3mm, 18–22mm uses 6×2.8mm, and 24–30mm uses 8×3.3mm.
Yes. These pulleys use the standard HTD-5M tooth profile (5mm pitch, rounded tooth form) and are compatible with any HTD-5M synchronous belt of 16mm width. They are interchangeable with other manufacturers' 5M pulleys of the same tooth count and belt width.
45# carbon steel (equivalent to C45 / AISI 1045) has a tensile strength of approximately 600–800 MPa and yield strength around 355 MPa in normalized condition. For typical CNC router, 3D printer, and light automation loads, this material provides ample strength. For very high-torque industrial drives, consult your system's torque requirements against the pulley's pitch diameter and belt tension limits.
No additional machining is required for standard use. The bore and keyway are finish-machined to tolerance. Simply slide the pulley onto your shaft, align the keyway with the shaft key, and secure with the appropriate set screw or retaining method. If your shaft diameter falls between standard bore sizes, a bore-to-size machining operation by a local machine shop is recommended.
45# carbon steel has moderate corrosion resistance. For indoor CNC, robotics, and dry automation environments, the material performs well over long service life. For humid, outdoor, or washdown environments, consider applying a light machine oil coating or using a corrosion-inhibiting spray after installation to extend service life.
HTD-5M pulleys are suitable for moderate-to-high speed synchronous drives. The maximum recommended belt speed for HTD-5M systems is typically up to 40 m/s, though practical limits depend on dynamic balance, bearing quality, and belt tension. For speeds above 3,000 RPM on small-diameter pulleys, verify dynamic balance requirements with your system design.
