Polyurethane Round Drive Belt — 1.5mm to 20mm Diameter, Red & Green, Cut to Length

Measure the groove or pulley channel your belt runs in. The belt diameter should match the groove width closely. For example, a 3mm groove typically takes a 3mm round belt. When in doubt, go slightly smaller — a snug fit transfers power more efficiently than a loose one. Our range covers 1.5mm (≈1/16") through 20mm (≈13/16") to suit most light-duty and medium-duty machinery.

For an open belt, measure the center-to-center distance between pulleys and add the circumference of both pulleys. For a joined loop, add roughly 5–10% extra for the splice overlap. We offer lengths from 1M up to 25M so you can cut exactly what you need. If you're unsure, order a longer piece — it's easy to trim, impossible to stretch.

Polyurethane round belts are generally suited for light-to-medium power transmission applications. Actual load capacity depends on diameter, pulley size, speed, and operating temperature. Larger diameters (10mm–20mm) typically handle heavier loads than smaller ones (1.5mm–3mm). For specific tension ratings, contact us to confirm suitability for your application.

Polyurethane is generally resistant to moisture, oils, and mild chemicals, making it more suitable for damp or lightly oiled environments than rubber alternatives. However, prolonged UV exposure or immersion in harsh solvents may degrade the material over time. For outdoor or chemically aggressive environments, contact us to confirm compatibility before ordering.

Smooth surface belts are ideal for standard pulley-groove drive applications where the belt runs inside a V or round groove. Rough (textured) surface belts provide additional grip and are typically used in flat-surface friction drives or conveyor applications where slip resistance matters. Choose based on your drive mechanism — if in doubt, smooth is the more common choice for groove-pulley systems.

Yes — round polyurethane drive belts are compatible with standard round-groove pulleys commonly found in woodworking machinery, textile equipment, food processing conveyors, and light industrial drives. Always verify the groove profile of your pulley matches the belt diameter you select. These belts are not designed for V-belt or flat-belt pulley profiles.

Yes. Polyurethane round belts can typically be heat-welded or chemically bonded to form a seamless loop. A heat gun or dedicated belt welder is the most common method — cut the belt to length, melt both ends, and press together for a strong join. This is a standard technique used in both industrial and DIY settings. Joining tools are sold separately.

In this listing, Red and Green variants correspond to different surface finishes (smooth vs. rough) in addition to color. Red variants are generally the smooth-surface option and Green variants the rough-surface option, though we recommend confirming via the variant SKU or by contacting us if your application requires a specific surface texture.