Measure the center-to-center distance between your two pulleys, then use the standard belt-length formula: Belt Length = 2 × C + π × (D1 + D2) / 2, where C is the center distance and D1/D2 are the pulley pitch diameters. For quick reference, 3525mm is approximately 138.6" and 4002mm is approximately 157.6". When in doubt, size up slightly — a belt that is marginally long is easier to tension than one that is too short. Contact us if you need help calculating your required length.

This belt uses the HTD 3M profile with a 3mm pitch (tooth-to-tooth distance). It is compatible with any standard HTD 3M pulley that has a matching 30mm groove width. HTD and trapezoidal (MXL, XL, L) profiles are not interchangeable — always verify your pulley's profile and groove width before ordering.

The steel wire tensile core generally allows these belts to handle moderate-to-high torque loads typical of CNC machine axes, 3D printer motion systems, and light industrial drives. Exact load capacity depends on pulley diameter, operating speed, and duty cycle. For heavy-duty or continuous industrial use, contact us to confirm suitability for your specific application.

Polyurethane (PU) belts are generally more resistant to oils, greases, and mild moisture than standard rubber belts. However, prolonged exposure to standing water, harsh UV, or aggressive chemicals is not typically recommended. For outdoor or washdown environments, confirm suitability with your specific conditions before installation.

Yes — this is a factory-made closed-loop (endless) belt. There are no joints, splices, or mechanical connectors. The seamless construction eliminates the weak points associated with joined belts and ensures consistent tension and smooth tooth engagement throughout the full circumference.

Loosen the motor or idler mount to reduce the center distance, slip the belt over both pulleys by hand, then re-tension by adjusting the mount until the belt has minimal slack without being overly tight. Do not pry the belt over pulley flanges — this can damage the steel wire core and cause premature failure. Refer to your machine's service manual for specific tensioning torque or deflection specifications.

HTD (High Torque Drive) belts use a curvilinear (rounded) tooth profile that distributes load more evenly across the tooth root, reducing stress concentration and generally supporting higher torque transmission compared to classic trapezoidal profiles (MXL, XL, L, H). HTD 3M belts and trapezoidal belts are not interchangeable — always match belt and pulley profiles exactly.