5M Zahnrad Pulley Riemenscheibe 48-80T Zahnriemenrad für 15/20/25mm Zahnriemen

Tooth count determines the pitch diameter and, combined with your motor pulley, sets the drive ratio. More teeth = larger diameter = higher belt speed at the same RPM. For CNC gantries, 48–55T is common on the motor side for moderate speed; 65–80T suits larger-diameter idler or driven pulleys where you need a speed reduction or a larger wrap angle.

A plain (round) bore relies on a set screw or press fit to secure the pulley to the shaft. A keyed bore includes a machined keyway slot that mates with a key on the shaft, providing a positive mechanical lock that prevents rotational slip under high torque — recommended for driven pulleys on motors with significant load.

Belt width affects load capacity. A 16 mm wide 5M belt is suitable for light-duty CNC and 3D printer axes. A 21 mm belt handles moderate torque loads such as extruder drives or small conveyor systems. A 27 mm belt is appropriate for heavier-duty applications where higher tension and torque transfer are required. Match the pulley belt-width option to the belt you are already using or plan to use.

Yes. These pulleys use the standard 5M tooth profile (5 mm pitch, HTD-style curvilinear tooth form), which is compatible with HTD 5M open-loop and closed-loop timing belts in the corresponding width. Confirm the belt width matches your selected pulley variant before ordering.

Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor workshop and lab environments. For applications exposed to moisture, cutting fluids, or outdoor conditions, consider applying a light coat of dry lubricant or anodizing the pulley. These pulleys are not recommended for prolonged immersion in water or aggressive chemical environments.

These pulleys are designed as drive or driven pulleys with a through-bore for shaft mounting. They can function as idler pulleys when mounted on a suitable shoulder bolt or idler shaft that matches the selected bore diameter. For a smooth-running idler, pair with a bearing pressed into the bore or use a bolt-and-bearing assembly sized to the bore.

Set screw size varies by bore diameter. Smaller bores (8–12 mm) typically use M3 or M4 set screws; larger bores (14–25 mm) typically use M4 or M5 set screws. Contact us to confirm the exact set screw specification for your selected variant before assembly.