How to Identify a Belt
Our Belt ID Chart can help you figure out what kind of replacement belt you need, and provides tips on how to measure with confidence.
Using the BESTORQ Belt ID Chart
When it’s time to replace a drive belt, having the right part number is critical. Ordering the wrong belt size or type can result in improper fit, reduced performance, and costly downtime. That’s where the BESTORQ Belt ID Chart comes in—it’s a quick, reliable tool for matching an existing belt to the correct replacement.
Why Belt Identification Matters
Belts may look similar at a glance, but differences in:
- Cross-section (A, B, 3V, 5V, etc.)
- Length
- Construction (wrapped, cogged, ribbed, timing)
…mean they’re not interchangeable. The Belt ID Chart eliminates guesswork, helping you match your belt exactly.
How to Use the BESTORQ Belt ID Chart
- Locate the Belt’s Markings
Many belts have size and section printed on the outer surface. If the markings are worn or missing, move to step 2. - Measure Belt Dimensions
- Top Width – The flat width across the belt’s top surface.
- Thickness – The belt’s height from top surface to base.
- Inside or Outside Circumference – Depending on belt type.
- Pitch or Datum Length – For timing belts or specific V-belt types.
- Match to the Chart
Using your measurements, find the corresponding section in the chart. BESTORQ’s Belt ID Chart lists dimensions alongside section profiles so you can quickly identify your belt type. - Confirm the Construction Type
Make sure you’re matching not just the size, but also whether it’s wrapped, cogged, V-ribbed, or a synchronous timing belt.
Pro Tips for Belt Replacement
- Always replace all belts in a set to maintain even tension.
- Check pulleys for wear—new belts on worn pulleys will fail faster.
- Use proper tensioning methods after installation to maximize belt life.
