Buy Round Belts Online in Australia
Round belts — also called O-ring belts, round drive belts or endless round belts — are circular cross-section drive belts used on light-duty conveyors, packaging lines and specialty drives where a flat or V-belt can't do the job, most often because the shafts aren't parallel or the drive needs to twist through a turn. AIMS Industrial stocks a small, focused round belt range: polyurethane (PU) round belt in two grades from Eagle, a mechanical connector for joining Eagle's quick-connect belt on site, and a genuinely endless, cord-reinforced round belt from Gates. It's a tight range rather than a broad one — below is exactly what we carry, and what each one is actually for. If you’ve got an OEM or third-party belt number, our Gates Belt Cross-Reference tool shows the Gates equivalent we stock.
Quick reference — the round belt range at AIMS
| Product | Brand | Diameters | Hardness / construction | Joining method | Best suited to |
|---|---|---|---|---|---|
| Red 85 Quick-Connect PU Round Belt | Eagle | 6, 8, 10, 12 mm | 85 Shore A, highly elastic | Mechanical QC Connector — no welding | Fast fit/refit without dismantling the driveshaft |
| Green 89 PU Round Belt | Eagle | 4, 5, 6, 8, 10, 12 mm | 89 Shore A, textured surface | Field-welded to length | Washdown and food-processing environments |
| QC Round Belt Connector | Eagle | 6, 8, 10, 12 mm | Mechanical connector | Re-openable, no welding | Joining or servicing the Red Quick-Connect belt |
| Round Endless Belt | Gates | 9 mm section, 16 standard lengths (128–564 mm) | Flex-Bonded polyester cord, Flex-Weave cover | Truly endless — no joint | Twisted/serpentine drives, line-shaft conveyors, sewing machines |
What round belts are used for
The round profile sets this belt type apart from a V-belt or flat belt: it runs on a simple round-groove pulley from any angle, and because it isn't a fixed flat shape, it can twist along its own axis. That makes it the right choice for quarter-turn or twisted drives, serpentine layouts, and light-duty conveying or motion-transfer jobs where fitting a flat or V-belt would mean dismantling more of the machine than the job warrants. Eagle's Red Quick-Connect belt targets situations where welding a belt in place isn't practical — it installs and comes apart again without pulling the driveshaft. Gates' round endless belt, being a genuine one-piece loop with no field joint, suits drives that need to run without the periodic maintenance a welded joint can bring.
The round belts we stock
Eagle Red 85 Quick-Connect PU round belt
An 85 Shore A, highly elastic polyurethane round belt sold per metre in 6, 8, 10 and 12 mm diameters. REACH and RoHS 2002/95/EC compliant, and — unlike a standard weldable PU belt — made up into an endless loop with the matching QC Connector rather than a heated weld, so it goes on and comes off again without dismantling the driveshaft.
Eagle Green 89 PU round belt
A firmer 89 Shore A polyurethane round belt with a textured, lower-friction surface, sold per metre in 4, 5, 6, 8, 10 and 12 mm diameters — the widest spread in our range, including our two smallest sizes. Built for above-average heat and water resistance, it's the belt of choice for wash-down environments such as food processing, and is made endless on site by field welding. AIMS doesn't stock a welding kit as part of this range — ask our team and we'll point you to a suitable supplier.
Eagle QC Round Belt Connector
A mechanical connector matched to the Red Quick-Connect belt's 6, 8, 10 and 12 mm diameters, giving a re-openable joint for servicing or shortening a belt in place. It's sold as a replacement/spare for that belt line specifically, not as a generic splice for any PU round belt.
Gates Round Endless Belt
A 9 mm section round belt built from Flex-Bonded polyester cord under a Flex-Weave cover, supplied as a genuine factory-made endless loop with no field joint at all. Static conductive to ISO 1813 and RMA IP3-3, rated across a −35°C to +60°C temperature range, and stocked in 16 standard lengths from 128 mm to 564 mm. Being truly endless, it suits quarter-turn and twisted drives, serpentine layouts, power-turn and line-shaft conveyors, and commercial sewing machines — anywhere a joint would be a weak point.
Sizing and pulley match
Round belts are specified by cross-section diameter, and for the Gates endless belt, by overall length too. Match the diameter to the groove of your round-groove or V-pulley — undersized and the belt rides low and can slip, oversized and it won't seat properly. Not sure which of our four products suits an existing drive? Send us the pulley groove size and whether it needs to be field-serviceable (the Quick-Connect belt) or genuinely joint-free (the Gates endless belt), and we'll match it for you.
Industries and applications
- Food processing and wash-down areas — the Green 89 belt's heat and water resistance suits frequent cleaning cycles.
- Packaging and light conveying — general light-duty conveying and motion-transfer drives across both Eagle belts.
- Twisted, serpentine and quarter-turn drives — where the belt itself needs to change plane, best served by the Gates endless belt or either Eagle PU belt.
- Line-shaft conveyors and power-turn drives — a Gates round endless application by design.
- Commercial sewing machines — a stated use for the Gates round endless belt.
- Drives needing fast, tool-light servicing — the Red Quick-Connect belt and its QC Connector, for fitting or replacing a belt without dismantling the driveshaft.
Brands we stock
Two brands: Eagle, for the polyurethane Red Quick-Connect and Green welded round belts and the matching QC Connector, and Gates, for the cord-reinforced round endless belt. We don't currently stock round belts under any other brand — if you need a specific brand match for an existing installation, ask us and we'll tell you plainly whether it's something we can source.
Companion ranges
Running round belts alongside other power transmission gear? These AIMS ranges pair with them: V-pulleys for the grooved pulleys round belts run on, industrial V-belts and micro V-belts for heavier or higher-speed drives, narrow section cogged belts and Polychain belts for higher-load synchronous drives, and our full belts range for everything else on the drive side.
Order from AIMS: Call our team on (02) 9773 0122 for stock, pricing or help matching a round belt to your pulley and drive, contact us with your specs, or request a quote for a bulk or account order. Industrial Supplies made Simple.
Frequently asked questions
What's the difference between the Red and Green Eagle round belts?
Hardness and how they're joined. The Red belt is 85 Shore A and joins mechanically with the QC Connector, with no welding needed. The Green belt is a firmer 89 Shore A with a textured, lower-friction surface, built for heat and water resistance, and is joined by field welding rather than a connector.
Do I need to weld a round belt to install it?
Only if you choose the Green 89 belt, which is field-welded to length. The Red 85 belt is designed around the opposite approach — it's made into a loop with the mechanical QC Connector, so no welding is required, and it can be fitted or removed without dismantling the driveshaft.
What diameters does AIMS stock in round belts?
4, 5, 6, 8, 10 and 12 mm in the Eagle Green PU belt; 6, 8, 10 and 12 mm in the Eagle Red PU belt and its matching QC Connector; and a 9 mm section in the Gates round endless belt, supplied in 16 standard lengths from 128 mm to 564 mm.
Can I get a round belt with no joint at all?
Yes — the Gates Round Endless Belt is a genuine factory-made endless loop with no field joint, built from Flex-Bonded polyester cord under a Flex-Weave cover. It's supplied in 9 mm section only, across 16 standard lengths.
What is the QC Round Belt Connector for?
It's the mechanical connector matched to Eagle's Red Quick-Connect belt (6, 8, 10 and 12 mm). It gives a re-openable joint for servicing or replacing the belt in place, and it's sized for that belt line specifically rather than as a universal splice.
Are these round belts suitable for food processing or wash-down areas?
The Eagle Green 89 belt is built for above-average heat and water resistance, which is why it's the one we'd point to for frequent wash-down environments such as food processing. Confirm your specific hygiene and chemical exposure requirements with our team before specifying.
What temperature range can these belts run in?
The Gates Round Endless Belt carries a stated −35°C to +60°C temperature range. We don't have a published operating temperature range for the Eagle PU belts on hand — if that's critical for your application, call us and we'll get the figure confirmed before you order.
Do round belts need a tensioner or take-up?
The Eagle Green 89 belt is specified as not requiring a take-up. For the other products in this range, centre-distance and tensioning needs depend on your specific drive layout — talk to our team if you're unsure.