The Ultimate Guide to V-Belt Sizing and Identification

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

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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.

Selecting the right V-belt involves several key considerations to ensure optimal performance and longevity. Here's a basic guide:

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1. Determine Belt Type: There are different types of V-belts, including classical V-belts, narrow V-belts, and cogged V-belts. Choose the type that best suits your application requirements.

2. Calculate Power Requirements: Calculate the power transmission requirements for your application, including torque, speed, and horsepower.

3. Identify Belt Size: Measure the center distance between the shafts of the driver and driven pulleys. This distance will determine the belt size needed.

4. Check Belt Length: Measure the length of the existing belt or calculate the required belt length using manufacturer's guidelines or online calculators.

5. Consider Environmental Factors: Take into account environmental conditions such as temperature, humidity, and exposure to chemicals or oils. Choose a belt material that can withstand these conditions.

6. Check Tensioning System: Ensure your system has proper tensioning mechanisms to maintain the tension within the recommended range for the selected belt.

7. Consult Manufacturer's Recommendations: Manufacturers often provide selection guides or online tools to help you choose the right V-belt for your specific application.

8. Verify Compatibility: Make sure the selected V-belt is compatible with your pulley system, including groove dimensions and angle.

9. Consider Belt Features: Depending on your application, you may need special features such as antistatic properties, oil resistance, or high-temperature resistance. Choose a belt with the appropriate features.

10. Review Maintenance Requirements: Consider the maintenance needs of the V-belt, including frequency of inspections, tension adjustments, and replacement intervals.

11. Cost Considerations: Balance the initial cost of the belt with its expected lifespan and performance. Cheaper belts may need to be replaced more frequently, resulting in higher long-term costs.

12. Safety Considerations: Ensure the selected V-belt meets safety standards and regulations applicable to your industry.

Here's a breakdown of the common types of V-belts and considerations for selecting the right one:

1. Classical V-Belts:

   • These are the traditional V-belts with a trapezoidal cross-section.
   • Suitable for standard industrial applications with moderate power transmission requirements.
   • Offer good flexibility and are cost-effective.
   • Available in various sizes and lengths.

2. Narrow V-Belts:

   • These belts are narrower than classical V-belts and have a higher power transmission capacity.
   • Ideal for applications with limited space or where high-speed operation is required.
   • Provide higher efficiency due to reduced bending losses.
   • Offer good resistance to heat and oil.

3. Cogged V-Belts:

   • Feature cogs or notches on the inner surface, which increase flexibility and reduce bending stress.
   • Provide smoother operation, especially in high-speed or high-torque applications.
   • Offer better heat dissipation and reduced noise compared to classical V-belts.
   • Suitable for applications with shock loads or frequent starts and stops.

4. Variable Speed V-Belts:

   • Designed for applications requiring variable speed control, such as variable speed pulleys or adjustable speed drives.
   • Offer smooth and precise speed control over a wide range.
   • Available in various constructions, including classical, narrow, and cogged designs.

5. Double V-Belts:

   • Consist of two V-belts joined back-to-back, providing increased power transmission capacity.
   • Suitable for heavy-duty applications or where a higher torque is required.
   • Offer greater stability and reduced slippage compared to single V-belts.

6. Fractional Horsepower (FHP) V-Belts:

   • Specifically designed for light-duty applications such as small appliances, fans, and power tools.
   • Offer good flexibility and reliability in low-power transmission scenarios.
   • Available in both classical and narrow profiles.

When selecting a V-belt, consider factors such as power transmission requirements, space constraints, operating conditions (temperature, humidity, etc.), pulley sizes, and belt speed. Additionally, consult manufacturer specifications and guidelines to ensure compatibility with your specific application. Regular maintenance and proper tensioning are also essential for maximizing the lifespan and performance of the V-belt.

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