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When your CNC router, 3D printer, or automation rig demands slip-free synchronous power transmission, a mismatched or undersized pulley becomes the weakest link in the entire drivetrain. Engineers and makers who need repeatable positioning accuracy rely on HTD-8M timing belt pulleys that hold tight tolerances under continuous load. These pulleys are designed for builders who cannot afford backlash, skipped teeth, or premature wear in their motion systems.
Each pulley is machined from 45# carbon steel and finished with a black oxide coating for corrosion resistance. The AF-type hub features a set-screw bore design compatible with standard metric shafts. Belt width is 32mm (approximately 1.26 in), pitch is 8mm (0.315 in), and tooth counts range from 10T to 40T. Bore options span 6mm to 28mm (approximately 0.24 in to 1.10 in) to suit a wide range of shaft diameters.
Typical use cases include CNC gantry drives requiring HTD 8M pulley 32mm wide configurations, high-torque 3D printer Z-axis or extruder systems using 8mm pitch timing pulleys, and industrial conveyor or pick-and-place automation needing AF-type steel timing pulleys with precise bore sizing.
| Belt Pitch | 8mm (HTD-8M) |
|---|---|
| Tooth Profile | HTD (High Torque Drive) |
| Number of Teeth | 10T – 40T (see variant options) |
| Belt Width | 32mm (1.26 in) |
| Bore Diameter | 6mm – 28mm (see variant options) |
| Hub Type | AF-type (set-screw) |
| Material | 45# Carbon Steel |
| Surface Finish | Black Oxide |
| Pitch Diameter Range | See variant options |
| Flange | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines the pitch diameter and, combined with the mating pulley, sets your drive ratio. A smaller tooth count (e.g., 10T–14T) is typically used on the motor shaft for speed reduction, while a larger count (e.g., 20T–40T) is used on the driven shaft. Calculate your required ratio by dividing the driven pulley teeth by the driver pulley teeth.
Select a bore diameter that matches your shaft diameter exactly. Available bores range from 6mm to 28mm. The AF-type set-screw hub clamps directly onto the shaft — no keyway is required. Measure your shaft with calipers before ordering to confirm the correct size.
Yes. These pulleys are designed for standard HTD-8M timing belts with an 8mm pitch and 32mm width. Ensure your belt is also rated for 32mm width (sometimes listed as 8M-32 or 8MGT-32). Using a narrower belt on a 32mm pulley is not recommended as it reduces torque capacity and can cause belt tracking issues.
45# carbon steel (equivalent to AISI 1045) has a typical tensile strength of approximately 600–700 MPa and yield strength around 355–490 MPa, making it well-suited for moderate-to-high torque synchronous drive applications. It is significantly stronger than aluminum pulleys and appropriate for CNC, robotics, and light industrial use.
Black oxide provides minimal corrosion protection on its own — it is primarily a cosmetic and mild surface treatment. These pulleys are intended for indoor CNC, robotics, and automation environments. For outdoor or high-humidity applications, additional lubrication or a protective coating is recommended.
No. This pulley uses the HTD-8M tooth profile, which is not interchangeable with GT2 (2mm pitch), GT3, MXL, or XL profiles. The tooth geometry and pitch are specific to HTD-8M belts. Using a mismatched belt profile will result in poor engagement, noise, and accelerated wear.
AF-type refers to a hub design with a set-screw (grub screw) that clamps the pulley onto a smooth shaft. It does not require a keyway or keystock. Other hub types may include keyed bores (requiring a matching keyway on the shaft) or taper-lock designs. AF-type is the simplest to install and is suitable for most CNC and robotics applications where shaft torque is within the set-screw's holding capacity.
