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When a skipped tooth or misaligned belt ruins a 20-hour print, the culprit is almost always a worn or undersized pulley. Makers, engineers, and Reprap builders who demand repeatable, backlash-free motion need a GT2 timing pulley that fits their exact shaft and belt without compromise.
These GT2 timing pulleys are machined from aluminum alloy with a smooth anodized finish. Each pulley is designed for standard 6mm-wide GT2 belts and is available in four tooth counts — 30T, 36T, 40T, and 60T — with bore sizes ranging from 5mm to 10mm (approximately 0.20" to 0.39"). A set screw secures the pulley to the motor shaft for a firm, slip-free grip.
Typical applications include GT2 belt drive systems on FDM 3D printers such as Reprap, Ender, and Prusa-style machines, as well as lightweight CNC router axes, laser engraver gantries, and small-scale robotics requiring precise rotary-to-linear motion conversion.
Choose from 30T, 36T, 40T, or 60T to match your drive ratio and print speed requirements without modifying firmware constants.
Available in 5mm, 6.35mm, 7mm, 8mm, and 10mm bore diameters to fit NEMA 17 and other common stepper motor shaft sizes directly.
Lightweight yet rigid aluminum body resists deformation under belt tension, maintaining tooth profile accuracy over extended use.
Precision-cut GT2 tooth geometry ensures smooth belt engagement, low noise, and minimal backlash for accurate positional control.
Integrated set screw clamps the pulley firmly to the motor shaft, preventing slippage during rapid direction changes and high-speed moves.
Designed for GT2 belt-driven motion systems including Reprap, Ender, Prusa, and lightweight CNC gantries requiring reliable linear motion.
| Belt Type | GT2 (2mm pitch) |
|---|---|
| Belt Width | 6mm |
| Tooth Count | 30T / 36T / 40T / 60T (see variant options) |
| Bore Diameter | 5mm / 6.35mm / 7mm / 8mm / 10mm (see variant options) |
| Material | Aluminum alloy |
| Shaft Lock | Set screw |
| Outer Diameter | See variant options |
| Flange | See variant options |
| Weight | See variant options |
| Finish | Anodized aluminum |
| Compatible Belt | GT2 6mm open-loop / closed-loop belt |
The tooth count determines your drive ratio and steps-per-mm value. Most Reprap and Ender-style printers use a 20T pulley as standard, but 30T, 36T, 40T, and 60T pulleys are used in custom builds or geared systems where a different mechanical advantage or resolution is needed. Always recalculate your steps/mm in firmware after changing tooth count.
Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant for a direct fit. If your motor has a D-shaft or flat, the set screw will lock onto the flat for a secure connection. The 6.35mm bore fits 1/4" shafts common in some US-spec motors.
Yes. These pulleys are compatible with both GT2 open-loop (cut-to-length) and GT2 closed-loop belts, provided the belt width is 6mm and the pitch is 2mm. Verify the inner circumference of any closed-loop belt matches your axis travel requirements before ordering.
Aluminum GT2 pulleys are widely used in 3D printers and CNC machines for long-term operation. The GT2 belt does most of the wear absorption. Under normal 3D printing loads, aluminum pulleys typically outlast the belt itself. For high-torque or abrasive environments, inspect periodically for tooth wear.
Yes. GT2 timing pulleys are a standard component in lightweight CNC routers and laser engraver gantry systems. Ensure your machine uses a 6mm GT2 belt and that the bore matches your motor shaft. Higher tooth counts (40T, 60T) provide more belt contact and smoother motion at lower speeds.
Each pulley includes a set screw. Slide the pulley onto the motor shaft, align it with the motor face at the correct height, then tighten the set screw with a hex key (Allen wrench). If your shaft has a flat, align the set screw to the flat for maximum grip and to prevent rotation under load.
A 60T pulley moves twice as much belt per revolution as a 30T pulley. This means lower torque multiplication but higher linear speed for the same motor RPM. In 3D printing, a larger pulley can reduce steps/mm, which may smooth motion on some controllers. A smaller pulley (30T) gives finer resolution per step. Choose based on your firmware capability and desired print speed.
