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When a slipping or misaligned drive pulley throws off your print accuracy or CNC repeatability, the root cause is almost always an undersized or poorly toleranced synchronous wheel. Makers, engineers, and automation builders who demand consistent motion control need a GT2 timing pulley they can trust across long run times without backlash or belt skip.
These GT2 timing pulleys are machined aluminum wheels designed for use with standard 6mm-wide GT2 belts. Available in 16, 20, 30, 36, and 40 tooth counts, with bore options ranging from 3.17mm to 12mm (approximately 0.125" to 0.472"), they cover the most common shaft sizes used in desktop motion systems. Hub height varies by variant — typically 14–16mm — providing a stable seating surface for set-screw or press-fit mounting.
Typical use cases include FDM 3D printer X/Y axis drives (GT2 belt linear motion), DIY CNC router and laser engraver feed systems, and lightweight robotic arm or conveyor synchronization projects where a reliable gt2 synchronous wheel gear is essential for repeatable positioning.
Choose from 16, 20, 30, 36, or 40 teeth to match your desired gear ratio and belt speed for precise motion control.
Bore options from 3.17mm to 12mm accommodate NEMA 17 stepper shafts (5mm), servo shafts, and custom CNC spindle diameters.
Standard 2mm tooth pitch ensures full compatibility with GT2 belts used across the 3D printing and CNC maker ecosystem.
Designed for 6mm-wide GT2 belts — the most widely used width in desktop motion platforms — for a secure, low-slip drive interface.
Machined from aluminum alloy for a low-inertia drive that reduces motor load while maintaining dimensional stability under continuous operation.
Order a single pulley for a quick replacement or a 5-pack for full-axis builds and workshop stock — both options available for every variant.
| Belt Type | GT2 (2mm pitch) |
|---|---|
| Belt Width | 6mm |
| Number of Teeth | 16 / 20 / 30 / 36 / 40 (see variant options) |
| Bore Diameter | 3.17mm / 4mm / 5mm / 6mm / 6.35mm / 7mm / 8mm / 10mm / 12mm (see variant options) |
| Hub Height | Typically 14–16mm (see variant options) |
| Material | Aluminum alloy |
| Finish | Natural anodized / bare machined aluminum |
| Mounting | Set screw (grub screw) — contact us to confirm |
| Packing Quantity | 1 pc or 5 pcs (see variant options) |
| Outer Diameter | See variant options |
Most NEMA 17-driven Cartesian and CoreXY printers use 20-tooth GT2 pulleys on the motor shaft. If you are replacing a worn pulley, match the existing tooth count. For custom builds, 20T is the standard starting point; higher tooth counts (30T, 40T) increase belt speed per motor revolution and are used in high-speed motion systems.
Measure your motor or shaft diameter with a caliper before ordering. NEMA 17 steppers typically have a 5mm shaft. Servo motors and CNC spindles vary — common sizes are 6mm, 6.35mm (1/4"), 8mm, and 10mm. Choose the bore that matches your shaft for a secure fit.
Yes. These pulleys work with both open-ended GT2 belt rolls and closed-loop GT2 belts, provided the belt width is 6mm and the pitch is 2mm. Always verify the belt width matches the pulley flange width before assembly.
Aluminum pulleys offer significantly better dimensional stability and wear resistance than injection-molded plastic pulleys. They resist deformation under belt tension and heat generated by continuous motor operation, making them the preferred choice for long-duration print runs and CNC cutting cycles.
Aluminum alloy has natural oxidation resistance that protects against light moisture exposure typical of indoor workshops. For environments with heavy condensation or chemical exposure, consider applying a light machine oil to the bore and hub area as a precaution.
No. These pulleys are designed specifically for 6mm-wide GT2 belts. Using a wider belt will cause the belt to ride over the flanges and slip off the pulley. If you need 9mm or 10mm belt compatibility, please contact us for alternative options.
Both options contain the same pulley. The 5-pack is ideal for full-axis builds (e.g., both X and Y motors plus spares), multi-machine workshops, or anyone who wants to keep replacement stock on hand. The per-unit price is lower in the 5-pack compared to buying five singles separately.
