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When your CNC router, 3D printer, or automation rig demands slip-free, repeatable motion, a mismatched or worn pulley becomes the weakest link in the entire drive train. Engineers, makers, and small-batch manufacturers who need a dependable 3M timing belt pulley with a wide selection of tooth counts and bore sizes will find this AF-type synchronous wheel covers the full range without compromise.
Each pulley is machined to accept 3M pitch timing belts (3 mm tooth pitch) and is offered in tooth counts from 12T to 60T, with bore diameters spanning 4 mm (0.16 in) to 22 mm (0.87 in). The slot width is fixed at 11 mm to match standard 3M belt widths. The AF-type flange design keeps the belt tracking true under lateral load, and the set-screw bore allows secure shaft mounting without additional hardware.
Typical use cases include open-loop stepper-driven linear stages requiring a 3M timing belt pulley for precise positioning, compact servo-driven conveyor systems where a synchronous wheel with a small pitch diameter saves space, and DIY robotics joints where a lightweight 12T–20T pulley reduces rotational inertia for faster response.
Available from 12T to 60T, letting you dial in the exact gear ratio your drive system needs without custom machining.
Standard round bores from 4 mm to 22 mm, plus keyed bore options (e.g., 8 mm 3×1.4 mm, 10 mm 4×1.8 mm, 12 mm 5×2.3 mm) for positive torque transmission on keyed shafts.
Integrated flanges on both sides of the pulley keep the 3M belt centered and prevent lateral walk during high-speed or reversing operation.
3 mm tooth pitch provides a balance of load capacity and compact size, well-suited for light-to-medium duty automation and motion control applications.
Each bore includes a radial set-screw flat or keyway (depending on bore variant) for secure, tool-accessible shaft locking without press-fit tooling.
Each listing is for one (1) pulley. Mix and match tooth counts and bore sizes to build a complete drive stage or replace a single worn component.
| Belt Pitch | 3M (3 mm tooth pitch) |
|---|---|
| Tooth Count | 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 35T, 36T, 38T, 40T, 44T, 45T, 48T, 50T, 55T, 60T |
| Bore Diameter | 4 mm – 22 mm (see variant options for keyed bore sizes) |
| Belt Width (Slot Width) | 11 mm |
| Pulley Type | AF-Type (flanged synchronous wheel) |
| Flange | Double-flanged |
| Shaft Fixing | Set screw (round bore) / Keyway (keyed bore variants) |
| Material | See variant options |
| Pitch Diameter (12T) | Approx. 11.46 mm (0.45 in) |
| Pitch Diameter (60T) | Approx. 57.30 mm (2.26 in) |
| Quantity | 1 piece per order |
The tooth count determines the pitch diameter and, combined with the mating pulley's tooth count, sets your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the speed reduction ratio. For example, a 12T driver paired with a 60T driven pulley gives a 5:1 reduction. Use smaller tooth counts (12T–20T) for compact, high-speed drives and larger counts (40T–60T) for higher torque at lower speed.
Measure your shaft diameter with a caliper and select the matching bore. For a plain round bore, choose the bore that matches your shaft exactly (e.g., 8 mm shaft → 8 mm bore). If your shaft has a keyway, select the keyed bore variant that matches both the shaft diameter and key dimensions — for example, "8 mm (3×1.4 mm)" means an 8 mm bore with a 3 mm wide × 1.4 mm deep keyway.
Yes — this pulley is designed for standard 3M pitch timing belts (3 mm tooth pitch, trapezoidal tooth profile). The slot width is 11 mm, so it is compatible with 3M belts up to 11 mm wide. It is not compatible with HTD 3M (round tooth) belts, which share the same pitch but use a different tooth profile. Always confirm your belt's tooth profile (trapezoidal vs. round) before ordering.
For round-bore variants, the set screw clamps against the shaft. Torque capacity depends on shaft diameter, set-screw size, and surface finish. For higher torque applications, use a keyed bore variant, which transfers torque through the key rather than friction alone, significantly reducing the risk of slippage under reversing or shock loads.
Corrosion resistance depends on the material of the specific variant. If your application involves moisture or outdoor exposure, contact us to confirm the material finish of your selected variant. For corrosion-sensitive environments, consider applying a light machine oil or anti-corrosion coating after installation.
Yes. The AF-type 3M timing belt pulley is motor-agnostic — it mounts to any shaft of the correct diameter. It is widely used on NEMA 17 and NEMA 23 stepper motor shafts (typically 5 mm or 6.35 mm) as well as servo motor output shafts. Select the bore that matches your motor shaft diameter and confirm the shaft has a flat or keyway if using a set-screw or keyed bore variant.
Yes. All variants in this listing have a fixed slot width of 11 mm, designed to accept standard 3M timing belts up to 11 mm wide. If your application requires a different belt width (e.g., 6 mm or 15 mm), this pulley is not suitable — please contact us for alternative options.
