PU Round Hollow Drive Belt — Polyurethane 5mm to 15mm, Connectible, with Brass or Aluminium Buckle Options

Match the belt diameter to your pulley groove width. For example, H5 (5mm) fits a 5mm groove, H8 (8mm) fits an 8mm groove. When in doubt, measure the groove width with calipers and select the closest size. A slightly snug fit generally provides better grip and power transfer. If your groove is between sizes, typically go with the smaller diameter for a tighter fit.

The Belt-only option ships as a continuous length of PU hollow tubing — you cut it to your required loop length and join the ends yourself using a metal pin insert or heat-welding method. The Brass Buckle and Aluminium Buckle options include a metal connector that clips into both hollow ends, allowing tool-free joining and easy re-joining if the belt needs to be removed and reinstalled. Buckle variants are counted in pieces (pcs) rather than meters.

PU round belts are generally rated for light-to-medium duty power transmission. They typically handle tensile loads suitable for small conveyor systems, textile machinery, packaging equipment, and similar applications. For heavy-duty or high-torque applications, please contact us to confirm suitability before ordering.

Polyurethane is generally resistant to oils, greases, and mild moisture exposure, making it more durable than standard rubber in oily workshop environments. However, prolonged outdoor UV exposure or continuous water immersion may reduce belt life over time. For outdoor or wet environments, we recommend periodic inspection and replacement as needed.

Yes. These PU round hollow drive belts are designed to work with standard round-groove pulleys. The hollow cross-section provides flexibility and grip. Ensure your pulley groove radius matches the belt diameter for optimal contact and power transfer. If you are unsure about compatibility with your specific pulley, contact us with your pulley specifications.

For the Belt-only option, the hollow PU tube can typically be joined by inserting a short metal pin or rod into both ends to create a loop, or by heat-welding the ends together using a heated wire or solvent. The hollow core makes it straightforward to create a seamless loop. If you prefer a faster, tool-free connection, choose the Brass or Aluminium Buckle variant instead.

Measure the total path length around your pulleys and add approximately 5–10% extra for tensioning and joining. For example, a system with a 500mm (≈19.7") center distance between two pulleys would typically need around 1,100mm (≈43.3") of belt. We offer lengths from 1 meter up to 50 meters to suit both prototyping and production needs. For buckle variants, order the number of pieces equal to the number of belt loops you need.

PU round hollow drive belts are commonly used in textile and sewing machinery, light conveyor systems, packaging and sorting equipment, woodworking machinery, printing equipment, and DIY automation projects. They are a popular replacement belt for older machinery where original belts are no longer available in standard sizes.