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When your motion system demands repeatable, low-backlash power transfer, a poorly matched pulley becomes the weakest link. Engineers, makers, and machine builders who rely on 2GT belt drives need a pulley that holds tight tolerances across every bore size and tooth count — without the guesswork of custom machining. These GT2 AF-type timing pulleys are designed for exactly that use case.
Each pulley is machined from aluminum alloy with an anodized finish, featuring a 2GT tooth profile and an 11 mm tooth width. The AF-type flange design keeps the belt tracking reliably under load. Tooth counts span 32T, 34T, 35T, 36T, and 38T; bore diameters range from 4 mm to 15 mm (approximately 0.157 in to 0.591 in), with optional keyway widths of 3 mm, 4 mm, or 5 mm depending on the variant. Outer diameter scales with tooth count, typically 20–25 mm (approx. 0.79–0.98 in).
Typical applications include GT2 belt-driven 3D printer axes (X/Y gantry drives), CNC router and laser cutter feed systems, lightweight robotic arm joints, and automated conveyor indexing — anywhere a 2GT timing belt pulley with a precise bore fit is required for synchronous motion control.
| Belt Profile | 2GT (GT2) |
|---|---|
| Tooth Count Options | 32T, 34T, 35T, 36T, 38T |
| Tooth Width | 11 mm |
| Bore Diameter Range | 4 mm – 15 mm (0.157 in – 0.591 in) |
| Keyway Width Options | Without keyway / 3 mm / 4 mm / 5 mm (see variant options) |
| Outer Diameter (approx.) | See variant options |
| Material | Aluminum alloy |
| Finish | Anodized |
| Flange Type | AF-type (double flange) |
| Compatible Belt Width | 6 mm, 9 mm |
| Quantity per Pack | 1 / 2 / 3 / 4 pcs (see variant options) |
The most common choice for 3D printer X/Y axes is 20T, but for AF-type pulleys in this range (32–38T), they are typically used on motor-side drives where a larger pitch diameter is needed for higher torque or reduced belt tension. Match your tooth count to your motion system's gear ratio and belt loop length. If you are replacing an existing pulley, match the tooth count exactly.
Variants without a keyway use a set screw (not included) to secure the pulley to the shaft. Keyway variants include a machined slot that accepts a standard key, providing a positive mechanical lock for higher-torque applications where set-screw-only retention may slip. Choose the keyway width that matches your shaft's key specification (3 mm, 4 mm, or 5 mm).
Measure your motor or drive shaft diameter with a caliper. Available bore sizes are 4 mm, 5 mm, 6 mm, 6.35 mm (1/4 in), 8 mm, 10 mm, 12 mm, 12.7 mm (1/2 in), 14 mm, and 15 mm. Select the bore that matches your shaft diameter exactly — a loose fit will cause runout and belt tracking issues.
Yes. These pulleys use the 2GT tooth profile, which is interchangeable with GT2 belts. They are compatible with 6 mm and 9 mm wide 2GT open-end and closed-loop timing belts commonly used in 3D printers, laser cutters, and CNC machines.
The pulleys are machined from aluminum alloy with an anodized surface treatment. Aluminum provides a good strength-to-weight ratio for most motion control applications. The anodized finish adds surface hardness and corrosion resistance. For very high-torque or abrasive environments, verify that aluminum meets your load requirements.
Yes. Each variant is available in packs of 1, 2, 3, or 4 pieces. Select the quantity option that matches your build requirements. Multi-pack options are priced per pack, not per piece, so review the listing carefully before adding to cart.
AF-type refers to the double-flange configuration where raised flanges on both sides of the tooth face constrain the belt laterally. This prevents the belt from walking off the pulley during operation, which is especially important in high-speed or vertically oriented belt drives. It reduces the need for additional belt guides or tensioners.
