GT2 Zahnrad - Pulley-Riemenscheibe-Zahnriemenrad 40T-100T- CNC-3D Drucker

Tooth count determines the pulley's pitch diameter and, combined with your motor steps-per-revolution and microstepping setting, sets the linear resolution of your axis. A 40T pulley on a 2 mm pitch belt moves 80 mm of belt per revolution; a 80T pulley moves 160 mm. Lower tooth counts give finer resolution per motor step; higher tooth counts increase speed at the same RPM. Match the tooth count to your desired steps-per-mm target.

Standard NEMA 17 stepper motors have a 5 mm output shaft. Select the 5 mm bore variant. If your motor has a D-cut shaft, the set screw will engage the flat and prevent rotation. NEMA 23 motors typically use a 6.35 mm (1/4 in) shaft — choose the 6.35 mm bore variant for those.

The belt width affects load capacity. A 10 mm wide GT2 belt and matching pulley can transmit roughly 60–70% more tension than a 6 mm combination, making it better suited for heavier gantries, dual-drive setups, or applications where belt stretch under load is a concern. For lightweight 3D printer axes, 6 mm is typically sufficient; for CNC routers or laser cutters with heavier carriages, 10 mm is recommended.

Yes. The GT2 2 mm pitch tooth profile is identical whether you use open-ended or closed-loop belts. Ensure the belt's inner circumference is appropriate for your axis travel and that the belt width matches the pulley variant you select (6 mm or 10 mm).

Each pulley includes a set screw. For best retention, align the set screw with the flat of a D-cut shaft if present, or tighten firmly against a round shaft. For high-torque or high-speed applications, consider applying a small amount of thread-locking compound to the set screw threads. Ensure the bore diameter matches your shaft diameter — an oversized bore will not clamp securely.

These pulleys are designed as drive pulleys with a set-screw bore. For idler use, you would typically mount the pulley on a bearing-equipped bolt or shaft. The pulley itself does not include a built-in bearing. If you need a smooth-spinning idler, pair this pulley with an appropriately sized bearing pressed into the bore or use a dedicated idler pulley with a flanged bearing.

The pulleys are machined from aluminum alloy with a natural anodized or machined finish. Aluminum is inherently corrosion-resistant in typical indoor workshop and maker-lab environments. For outdoor or high-humidity applications, consider applying a light coat of dry lubricant or corrosion inhibitor to the exposed surfaces.