HTD 8M Timing Belt – 25mm Wide, 8mm Pitch, Closed Loop, 1000–4400mm

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 center distance and D1/D2 are pulley pitch diameters. Each variant lists both tooth count and circumference in mm — for example, a 150-tooth belt is 1200mm (≈47.2") around. When in doubt, size up slightly; a belt that's a tooth or two longer is easier to tension than one that's too short.

HTD 8M belts are generally rated for moderate-to-heavy power transmission. The 8mm pitch profile provides a larger tooth engagement area than 5M or 3M belts, making them suitable for applications typically requiring 1–10 kW depending on speed, pulley size, and tension. Confirm your specific load requirements with your drive system designer or contact us for guidance.

HTD timing belts are typically constructed from neoprene rubber with fiberglass or steel cord reinforcement, which offers good resistance to moisture, oils, and moderate temperature ranges (generally –30°C to +80°C / –22°F to +176°F). For prolonged outdoor UV exposure or aggressive chemical environments, contact us to confirm suitability for your specific application.

Yes. This belt follows the HTD (High Torque Drive) 8M profile standard — 8mm pitch, rounded curvilinear tooth — and is compatible with any HTD 8M pulley with a 25mm or wider face. It is not interchangeable with GT2, GT3, T5, T8, T10, or trapezoidal-profile pulleys. Always verify the tooth profile and pitch of your existing pulleys before ordering.

Since the pitch is 8mm, the relationship is straightforward: Circumference (mm) = Tooth Count × 8. For example, 150 teeth = 1200mm, 200 teeth = 1600mm, 300 teeth = 2400mm. Each variant in this listing is labeled with both values so you can match either measurement to your application.

HTD (High Torque Drive) belts use a rounded, curvilinear tooth profile optimized for high-torque, lower-speed power transmission. GT2/GT3 belts use a modified curvilinear profile with tighter tolerances, preferred for precision positioning applications such as 3D printers and CNC machines. HTD 8M is generally chosen for industrial drives where torque capacity is the primary concern rather than sub-millimeter positioning accuracy.

It is not recommended. The pulley face width should match or exceed the belt width to ensure full tooth engagement and prevent the belt from tracking off the pulley under load. A 25mm wide belt should be paired with pulleys that are at least 25mm wide, ideally with flanges on at least one side to guide the belt laterally.