HTD 3M Closed Timing Belt – 15mm Wide, 300mm–498mm Circumference, Arc Tooth Rubber Drive Belt

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. This range covers 300mm (≈11.8") to 498mm (≈19.6") in 3mm steps, so you can typically find an exact match. When in doubt, size up by one 3mm increment to allow for tensioner adjustment.

This belt uses the HTD 3M arc-tooth profile — a 3mm pitch with a rounded tooth form. It is not compatible with GT2 (2mm pitch) or trapezoidal-tooth pulleys (MXL, XL, L, T2.5). Always pair with HTD 3M pulleys. Mixing profiles causes poor mesh, accelerated wear, and potential tooth skipping under load.

HTD 3M belts at 15mm width are generally rated for light-to-medium duty torque transmission. They are typically sufficient for 3D printer axis drives, desktop CNC gantries, laser engravers, and small robotics joints. Exact load capacity depends on pulley diameter, belt speed, and wrap angle. For heavy industrial applications, a wider belt or larger pitch (e.g., HTD 5M or 8M) is generally recommended.

The rubber construction offers reasonable resistance to moisture and mild humidity, making it generally suitable for semi-protected or indoor-damp environments. Prolonged exposure to direct UV sunlight, petroleum-based oils, or temperatures outside the typical –20°C to 80°C range may accelerate degradation. For harsh outdoor installations, contact us to confirm suitability before ordering.

Yes — this belt is manufactured to the standard HTD 3M tooth profile with a 15mm width. It is generally compatible with any HTD 3M pulley that has a groove width of 15mm or wider (with flanges). If your pulley groove is narrower (e.g., 9mm or 6mm), this belt will not seat correctly. Verify your pulley's groove width specification before ordering.

Order 1 piece for a single-axis replacement or prototype. Order 2 pieces if you are building a CoreXY 3D printer (which uses two belts on the XY gantry) or want a spare on hand. Order 3 pieces for multi-axis machines, group builds, or to maximize the per-unit price discount. Multi-piece quantities are priced lower per belt than single-piece orders.

HTD 3M belts at 15mm width are commonly found in FDM 3D printers (CoreXY and Cartesian), desktop CNC routers, diode laser engravers, pick-and-place machines, and small robotic arm joints. The 15mm width is chosen when the application needs more torque capacity or better lateral stability than the narrower 6mm or 9mm variants provide.