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When a skipped tooth or a wobbling pulley ruins a print or throws off a CNC cut, the root cause is almost always a poorly dimensioned drive component. Makers, engineers, and machine builders who demand repeatable, backlash-free motion need pulleys machined to tight tolerances — not cast approximations. These GT2 2GT timing belt pulleys are designed for exactly that audience: anyone building or upgrading a CNC router, 3D printer, laser engraver, or RepRap-style machine where positional accuracy is non-negotiable.
Each pulley is machined from aluminum alloy and features a 2mm GT2/2GT tooth profile with an 11mm belt-contact width. Tooth counts span 60T through 78T (60, 62, 64, 65, 66, 68, 70, 72, 74, 75, 76, and 78 teeth), giving outer diameters that range from approximately 38mm to 50mm (1.50"–1.97"). Through-hole bore options cover 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, and 25mm plain bore, plus a full range of keyway (K) variants for positive shaft engagement.
Typical use cases include large-format CoreXY and Cartesian 3D printers where a higher tooth count reduces belt wrap angle stress, CNC plasma and router tables requiring smooth, high-torque transmission, and stepper-driven automation rigs where a specific gear ratio demands a non-standard tooth count. The stepped hub design allows secure shaft clamping with set screws, making these pulleys a direct fit for GT2 2GT open or closed-loop belt systems.
| Belt Profile | GT2 / 2GT, 2mm pitch |
|---|---|
| Belt Width Compatibility | 11mm (2GT-11) |
| Tooth Count Options | 60T, 62T, 64T, 65T, 66T, 68T, 70T, 72T, 74T, 75T, 76T, 78T |
| Bore Type | Plain through-hole or Keyway (K) — see variant options |
| Plain Bore Sizes | 5, 6, 6.35, 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, 20, 25mm |
| Keyway Bore Sizes | 8mm K3, 10mm K3, 10mm K4, 12mm K4, 12.7mm K5, 14mm K5, 15mm K5, 16mm K5, 17mm K5, 18mm K6, 19mm K6, 20mm K6, 25mm K8 |
| Hub Style | Stepped hub with set-screw clamping |
| Material | Aluminum alloy |
| Tooth Width | 11mm |
| Approximate OD Range | ~38mm–50mm (1.50"–1.97") depending on tooth count |
| Quantity per Order | 1 piece |
| Weight | See variant options |
The correct tooth count depends on your target steps-per-mm and the stepper motor's step angle. For most standard 3D printers using 1/16 microstepping and a 200-step motor, a 20T pulley is common — but larger machines with longer belt runs often use 60T–80T pulleys on idler or reduction stages to manage belt wrap and tension. Check your machine's belt routing diagram or motion system documentation to confirm the required tooth count before ordering.
A plain bore is a smooth cylindrical hole secured to the shaft using one or two set screws tightened against the shaft surface. A keyway bore includes a machined slot (the keyway) that accepts a matching key inserted into the shaft, providing a positive mechanical lock that prevents rotational slipping under high torque. For most 3D printer and light CNC applications, plain bore is sufficient. For heavy-duty CNC routers, plasma tables, or any application with significant torque reversals, a keyway bore is recommended.
Yes — these pulleys are machined to the GT2 / 2GT 2mm-pitch tooth profile and are compatible with standard GT2 and 2GT timing belts. The tooth width is 11mm, so they are designed for 11mm-wide (2GT-11) belts. If your belt is 6mm wide (2GT-6), these pulleys will still mesh correctly but the belt will not span the full tooth width; for best results, match the belt width to the pulley width.
Measure the outer diameter of your motor shaft or drive shaft with a caliper. Common stepper motor shaft diameters are 5mm and 6.35mm (1/4"). For servo motors or larger CNC spindles, shafts of 8mm, 10mm, 12mm, 14mm, and larger are typical. Select the bore size that matches your shaft diameter exactly — a loose fit will cause vibration and positional error, while an oversized bore cannot be corrected without machining.
These pulleys are machined from aluminum alloy, which provides a good strength-to-weight ratio for belt-driven motion systems. For light to medium CNC routing and plasma cutting applications, aluminum pulleys perform reliably. In very high-load or high-speed industrial environments, steel pulleys may be more appropriate. If you are unsure whether aluminum is suitable for your specific load and duty cycle, contact us to confirm before ordering.
Set screw inclusion varies by variant. Please check the product images or contact us to confirm whether set screws are included with your selected bore size. Standard M3 or M4 set screws are widely available at hardware stores if not included.
These pulleys are compatible with CoreXY, Cartesian, and delta motion systems that use GT2 / 2GT 2mm-pitch belts. The 60T–78T range is most commonly used as idler or reduction pulleys in large-format machines rather than as direct motor drive pulleys. Verify your machine's BOM (bill of materials) or motion system schematic to confirm the required tooth count and bore size before purchasing.
