Skip to main content

Find the right belt with confidence—fast, smart, and friction-free.

When it comes to replacing or sourcing V-belts, getting the size right is everything. A belt that's too short, too wide, or simply the wrong profile won’t just impact performance—it could damage your machinery.

At AIMS Industrial, we know your time is valuable. That’s why we’ve made sizing, identifying, and purchasing V-belts easier than ever.

 

How Do I Measure a V-Belt for Replacement?

To find a replacement V-belt:

  1. Measure the Top Width – This is the widest part of the belt across the top.
  2. Measure the Outside Circumference – Use a flexible measuring tape or a string to wrap around the belt’s outer edge.

Pro tip: If the belt is broken or missing, measure the distance between pulleys and consult a size calculator or chart.

 

How to Read a V-Belt Size Code

A V-belt code typically includes:

  • Letter – Indicates the cross-section profile (A, B, C, etc.)
  • Number – Denotes the belt's length (in inches or mm)

Example: A "B85" belt means it has a B-profile and is approximately 85 inches in length.

 

What Do the Letters (A, B, C, etc.) on V-Belts Mean?

These letters correspond to standard cross-sectional sizes:

  • A: 13mm top width
  • B: 17mm
  • C: 22mm
  • D, E: Wider belts for heavier loads

Knowing your profile ensures compatibility with the right pulleys and performance requirements

Pitch Length, Effective Length, and Top Width – What’s the Difference?

  • Top Width: Measured across the belt’s top surface—used to identify cross-section.
  • Pitch Length: Theoretical length at the belt’s "pitch line" (neutral axis). Used for engineering calculations.
  • Effective Length: The working length when the belt is under tension on the pulleys.

Inside vs. Outside Length:

  • Inside Length (Li): Measured along the inner surface.
  • Outside Length (La): Measured across the belt’s outer curve.
  • Pitch Length (Lp): Falls between Li and La—often used in manufacturer specs.

How to Identify the Right Cross-Section

Use a vernier caliper or ruler to measure:

  • Top width of the belt
  • Overall height of the belt’s side profile

Compare the results with a V-belt profile chart to match your belt to an A, B, C (etc.) profile.

Using a V-Belt Size Chart Effectively

Once you've measured:

  • Match your top width to the cross-section profile (e.g., B = 17mm)
  • Match your length (outside or pitch, depending on the chart) to the correct model

Most charts also show tolerance ranges, so even if you're slightly off, you can find a belt that fits.

Final Thoughts

Getting your V-belt size right doesn’t have to be complicated. Just remember:

  • Measure top width and circumference
  • Understand the size code
  • Use a chart or AIMS Industrial’s guided filters

And if you’re ever unsure, our expert team (and smart AI tools) are here to help.

Browse our full range of V-belts here or chat with a product expert today.

 

Looking for V-belts near you? We’ve got you covered!

Whether you need a quick replacement or want to upgrade, local stock of quality V-belts is ready to keep your machines running smooth.

At AIMS Industrial, we offer a wide range of V-belts in all major profiles — plus expert advice and fast delivery right to your door.

Just tell us what you need, and we’ll help you find the perfect fit!

 

Not all V-belts are built the same. Get the lowdown on types, materials, and what makes each one tick.

Up Next: V-Belt Selection & Application: The Smart Way to Choose the Right Belt