2GT 55T-110T Timing Belt Pulley Pitch 2mm With Step Width 7/11mm for 3D Printer

The tooth count determines the pulley's pitch diameter and, combined with your motor's steps-per-revolution, affects your printer's steps-per-mm. Most Cartesian and CoreXY printers use 20T pulleys on the motor shaft paired with larger idler or driven pulleys. If you are replacing a driven pulley or building a reduction stage, match the tooth count to your existing belt loop length and desired gear ratio. For direct-drive axis systems, 55T–80T pulleys are common; for reduction drives, 90T–110T pulleys provide more torque multiplication.

Select the belt width that matches your existing timing belt. The 7mm-wide pulley is designed for 6mm GT2 belts (with side clearance) or 7mm-wide belts, and is the standard choice for most desktop 3D printers. The 11mm-wide pulley suits wider belts used in heavier-duty CNC routers or laser engravers where higher belt tension is needed. Mismatching belt and pulley widths can cause belt tracking issues and premature wear.

Standard NEMA 17 stepper motors have a 5mm output shaft diameter. Select the 5mm bore variant for a direct fit. If your motor has a D-cut (flat) shaft, ensure the set screw on the pulley hub aligns with the flat for a secure, non-slip connection. For servo motors or custom shafts, measure your shaft diameter carefully before selecting a bore size.

Yes. The 2GT tooth profile is dimensionally identical to the GT2 profile and is fully compatible with standard GT2 open-loop timing belts (sold by the meter) and GT2 closed-loop belts (fixed-length loops). Ensure the belt pitch is 2mm and the belt width matches your selected pulley width (7mm or 11mm).

The aluminum alloy construction provides a good strength-to-weight ratio suitable for the belt tensions typical in desktop 3D printers, laser engravers, and light CNC applications. The stepped hub with set-screw locking maintains concentricity under continuous operation. For heavy industrial loads or high-shock environments, verify that the belt tension and torque requirements fall within the rated capacity of the aluminum pulley and the GT2 belt system.

The natural anodized aluminum finish provides a basic level of corrosion resistance suitable for indoor workshop and laboratory environments. Aluminum alloy does not rust, and the anodized surface adds additional oxidation protection. For environments with exposure to cutting fluids, coolants, or high humidity, periodic cleaning and light lubrication of the bore and set-screw threads is recommended to maintain performance.

These pulleys are designed as driven or drive pulleys with a through-bore for shaft mounting. They are not pre-fitted with bearings. To use one as an idler, you would need to press-fit or otherwise install an appropriate bearing (matching the bore diameter) and mount it on a fixed pin or bolt. This is a common DIY modification in 3D printer builds.