Measure the center-to-center distance between your pulleys, then use the standard belt length formula: Belt Length ≈ 2 × Center Distance + π × (D1 + D2) / 2, where D1 and D2 are the pitch diameters of your pulleys. This product covers perimeters from 498mm (≈19.6″) to 699mm (≈27.5″) in 3mm increments. When in doubt, size up slightly — a belt that is too tight will accelerate bearing wear and reduce belt life.

The embedded steel wire tensile cord resists elongation under load, maintaining consistent tooth pitch and preventing belt stretch over time. This is especially important in closed-loop motion systems like 3D printers and CNC routers where positional accuracy depends on belt integrity. Compared to fiber-cord or rubber-only belts, steel wire cores typically deliver lower creep and longer dimensional stability.

Polyurethane (PU) generally offers better resistance to oils, greases, and mild moisture compared to neoprene rubber belts. However, prolonged exposure to standing water, UV radiation, or harsh chemicals is not recommended. For outdoor or washdown environments, contact us to confirm suitability for your specific conditions.

Yes. This belt follows the HTD (High Torque Drive) 3M profile — 3mm pitch, rounded tooth profile — and is compatible with any standard HTD3M pulley. The 20mm belt width requires a pulley with a usable face width of at least 20mm. Always verify pulley tooth count and bore size separately before ordering.

Exact load ratings depend on speed, pulley diameter, and wrap angle. HTD3M belts at 20mm width are generally suited for light-to-medium duty applications — typically up to a few hundred watts of transmitted power at moderate speeds. For high-torque or continuous industrial duty cycles, contact us to confirm specifications before purchasing.

Each pack contains individual closed-loop belts of the same perimeter and width. Buying 2 or 3 pcs at once is ideal for dual-axis machines (e.g., CoreXY printers that use two belts of the same length), keeping a spare on hand, or multi-unit production builds. The per-belt cost is lower in multi-packs.

This belt uses the HTD3M profile: 3mm pitch with a rounded (curvilinear) tooth form. The rounded profile distributes load more evenly across the tooth root compared to trapezoidal MXL or T-series belts, reducing stress concentration at higher torque levels. HTD3M pulleys and belts are not interchangeable with T2.5, T5, MXL, or GT2 profiles — always match belt and pulley profiles exactly.