GT2 Zahnrad Riemenscheibe Zahnriemenrad Pulley 6mm-10mm 16 20 24 25 26 Zähne

The most common choice for Cartesian and CoreXY printers (Ender 3, Voron, RatRig, etc.) is the 20T pulley, which pairs with standard GT2 belt to give approximately 40 mm of travel per motor revolution — matching the default firmware steps/mm settings on most machines. Use 16T for a shorter travel per revolution (higher torque, lower speed) or 24T–26T for longer travel (higher speed, lower torque). Always recalibrate your steps/mm in firmware after changing tooth count.

Standard NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm bore variant for a direct fit. If your motor has a flat (D-cut) shaft, the set screw on the pulley will lock onto the flat for a secure, slip-free connection. NEMA 23 motors typically use an 8 mm shaft — choose the 8 mm bore variant in that case.

Yes. The 2 mm GT2 tooth profile is identical whether you are using open-ended belt sold by the meter or pre-formed closed-loop belts. Simply match the belt width (6 mm or 10 mm) to the pulley width you select. The flanges on each side of the pulley keep the belt tracking correctly during operation.

Aluminum alloy pulleys are significantly more rigid and dimensionally stable than injection-molded plastic alternatives. They resist deformation under belt tension, maintain tooth geometry at elevated temperatures (such as near a heated print bed), and do not creep over time. For any application requiring consistent positioning accuracy — CNC routing, precision 3D printing, or robotics — aluminum is the recommended material.

The anodized layer converts the outer surface of the aluminum into aluminum oxide, which is harder than bare aluminum and highly resistant to moisture, mild chemicals, and abrasion. In a typical indoor workshop or enclosed 3D printer environment, the finish will remain intact for the life of the pulley under normal use. Avoid prolonged exposure to strong acids or alkalis.

No — belt width and pulley width must match. A 10 mm belt on a 6 mm pulley will overhang the flanges and track poorly, causing premature wear and potential belt derailment. Always select the pulley width that matches your belt. If you are upgrading from 6 mm to 10 mm belt for higher load capacity, replace both the pulleys and the belt at the same time.

Set screws are included with each pulley. The set screw size varies by bore diameter — typically M3 for smaller bores (4–5 mm) and M4 for larger bores (6–8 mm). A standard hex/Allen key (usually 1.5 mm or 2 mm) is all you need for installation. Tighten the set screw against the motor shaft flat (if present) for maximum grip.