HTD 3M Zahnrad-Pulley Riemenscheibe K-Typ Zahnriemenrad für 6/10/15mm Zahnriemen

The tooth count determines the pitch diameter and, combined with your motor pulley, sets the drive ratio. A smaller tooth count (e.g., 12T) on the motor and a larger count (e.g., 24T) on the driven shaft gives a 2:1 speed reduction with doubled torque. Use the formula: ratio = driven teeth ÷ driver teeth. Select tooth counts that achieve your target speed or torque while keeping belt tension within the belt manufacturer's recommended range.

A K-type keyway bore includes a precision-machined slot (keyway) in the bore that accepts a matching key inserted between the shaft and pulley. This creates a positive mechanical lock that prevents rotational slipping under high torque or reversing loads — situations where a set screw alone may loosen over time. If your application involves high torque, frequent direction changes, or vibration, a K-type keyway variant is recommended. For light-duty or low-torque builds, a standard round bore with set screw is typically sufficient.

Belt width determines the load capacity of the drive. A 6 mm wide HTD 3M belt is suitable for light loads such as 3D printer axes and small CNC routers. A 10 mm belt handles moderate loads in mid-size CNC and conveyor applications. A 15 mm belt is appropriate for heavier-duty drives where higher torque transmission is required. Match the pulley belt-width option to the belt you are already using or plan to purchase — mixing widths is not recommended.

Yes. These pulleys are machined to the HTD 3M standard tooth profile (3 mm pitch, rounded tooth form). They are compatible with any standard HTD 3M open-end or closed-loop timing belt of the matching width (6 mm, 10 mm, or 15 mm). They are not compatible with MXL, GT2, T5, or other belt profiles — the tooth geometry differs and mixing profiles causes premature wear and skipping.

Use a digital caliper to measure the outer diameter of your motor or drive shaft at the mounting point. Select the bore diameter that matches your shaft exactly — the bore should be a close sliding fit, not loose. For K-type keyway variants, also measure the key dimensions on your shaft (key width and depth) to confirm compatibility with the keyway size indicated in the variant name (e.g., K3 = 3 mm key width). If your shaft diameter falls between two available bore sizes, choose the smaller bore and have it reamed to size by a machine shop.

These pulleys are machined from aluminum alloy with an anodized surface finish. Anodizing creates a hard oxide layer that resists light corrosion, scratching, and wear in typical indoor workshop and automation environments. They are not recommended for continuous exposure to salt spray, strong acids, or alkaline solutions. For outdoor or wet environments, consider applying a light coat of corrosion-inhibiting lubricant to the bore and set screw area after installation.

Yes. These pulleys can be used on either the driver or driven shaft. For a speed-reduction drive, mount the smaller tooth count pulley on the motor shaft and the larger tooth count pulley on the load shaft. For a speed-increase drive, reverse the arrangement. Ensure both pulleys are aligned on the same plane and that belt tension is set correctly to avoid premature belt or pulley wear.