Measure the center-to-center distance between your two pulleys, then calculate the required belt circumference using the standard formula: Belt Length ≈ 2 × C + π × (D1 + D2) / 2, where C is the center distance and D1/D2 are the pulley pitch diameters. For example, a 3600mm belt is approximately 141.7" in circumference. When in doubt, size up slightly to allow for tensioner adjustment. All 136 variants are listed in the Model selector above in millimeters.

HTD 3M belts are generally suited for light-to-medium duty power transmission. The steel wire tension cord provides good tensile strength for the 3M pitch class. Exact load ratings depend on pulley diameter, operating speed, and wrap angle — consult your drive design specifications or contact us to confirm suitability for your specific application.

Polyurethane (PU) timing belts are generally more resistant to oils, mild chemicals, and moisture than standard neoprene belts. However, prolonged exposure to UV radiation or standing water may reduce service life. For outdoor or washdown environments, verify your specific operating conditions before installation.

Yes. This belt uses the HTD 3M tooth profile with a 3mm pitch, which is compatible with standard HTD 3M pulleys. The 15mm belt width requires a pulley groove width of at least 15mm. Always verify your pulley's pitch profile and groove width before ordering to ensure proper tooth engagement.

PU belts with steel wire cores typically offer higher dimensional stability, lower elongation under load, and better resistance to oils compared to neoprene/fiberglass belts. They are a good choice for precision positioning applications such as CNC machines, 3D printers, and robotics where belt stretch would degrade accuracy. Neoprene belts may be preferred where flexibility at low temperatures is critical.

HTD stands for High Torque Drive. The HTD tooth profile is a rounded curvilinear shape, as opposed to the flat-sided trapezoidal profile used on MXL, XL, or L series belts. The rounded profile distributes load more evenly across the tooth root, reducing stress concentration and improving engagement — particularly at higher torque levels. HTD and trapezoidal belts are not interchangeable; always match belt and pulley profiles.

The tooth count equals the belt circumference divided by the pitch (3mm). For example: a 3399mm belt has 1133 teeth, a 3600mm belt has 1200 teeth, and a 3993mm belt has 1331 teeth. If your application requires a specific tooth count, divide that number by 3mm to find the required circumference, then select the matching variant.