Round Belts

Round Belts for Australian Light Industrial and Conveyor Drives

Round belts (also called O-ring belts or round drive belts) are circular cross-section drive belts used in light industrial conveyors, packaging machinery, and small drive applications. They run on V-pulleys with circular grooves, suit non-parallel shaft drives where flat or V-belts can't track properly, and can be supplied in continuous loops or as weldable polyurethane stock for custom-length manufacture. AIMS Industrial supplies round belts across the diameters and constructions Australian light industrial users actually need.

The round belt types we stock

• Solid polyurethane (PU) round belt — the most common construction, weldable for custom lengths
• Reinforced PU round belt — with internal cord for higher load capacity
• Hollow round belt — for very light loads where flexibility is the priority
• Pre-made loops — endless construction for higher-load applications where joints can't be tolerated
• Weldable PU stock — sold by the metre for cutting and welding to length on site

Where round belts earn their place

• Conveyor drives — light-duty product handling where flat belts are over-engineering
• Packaging machinery — small drives in packaging lines, bag-making, and product feeding
• Office equipment — printers, copiers, and document handling equipment
• Vending and dispensing machinery — small drives in commercial vending equipment
• Non-parallel shaft drives — applications where the drive shafts aren't parallel; round belts handle the geometry

Sizing — diameter and length

Round belt sizing is by belt diameter (cross-section) and either length (for loops) or by quantity (for weldable stock sold by the metre). Common diameters range from 2mm through 20mm. Match diameter to the pulley groove size — undersized belts ride low in the groove and slip; oversized belts ride high and don't engage properly.

Welding round belts to length

Solid polyurethane round belts can be welded to custom length on site using a heated tool. The procedure: cut both ends square, heat the tool to the manufacturer-specified temperature, press both ends against the heated tool until softened, remove from the tool and quickly press the ends together. The weld cools and hardens within seconds. A properly-welded joint is typically 80-90% of the unwelded belt strength. Welding tools are stocked alongside the weldable belt stock.

Why round belts over V-belts

• Non-parallel shaft drives — round belts can twist around their own axis, V-belts cannot
• Quiet operation — no slap or chatter at the pulley engagement
• Custom lengths — weldable stock allows on-site custom lengths without specialist equipment
• Light loads — for drives where V-belts are over-engineered
• Compact installations — small pulley diameters that V-belts can't tolerate

Companion ranges at AIMS

Round belts sit alongside our broader drive belt range — see micro V-belts, narrow section cogged belts, Polyflex belts, and Polychain belts for the broader drive belt range.

Need help speccing round belt or sourcing weldable stock for an existing drive? contact our team — we'll match by diameter, length, and load.