Technical Guides
Complete V-Belt Size Chart & Section Guide
Practical reference chart for V-belt sections, dimensions, widths, and profiles used by workshops, factories, and buyers.
Table of contents
- Classical V-Belt Sections
- Classical section notes
- Wedge Belt Sections
- Wedge profile advantages
- Narrow V-Belt Sections
- V-Belt Section Comparison Table
- How to Identify Belt Sections
- Measure the width
- Measure the height
- Read the printed markings
- Avoid common mistakes
- Common V-Belt Applications
- Common Mistakes
- Practical Examples
- Example 1
- Example 2
- Why Section Identification Matters
- Visual placeholders
- Internal links
V-belt sections define the belt profile, including top width, height, and the shape that fits the pulley groove. The dimension matters because a belt can be the wrong section even if the length looks close. Correct section selection helps reduce slippage, heat, premature wear, and replacement errors.
Classical V-Belt Sections
Classical sections are the traditional belt families used across many industrial drives. They are identified by their cross-section dimensions and their common pulley compatibility.
| Section | Top width | Height | Approximate pitch width | Common applications |
|---|---|---|---|---|
| Z | 10 mm | 6 mm | 8.5 mm | Light drives, small fans, compact machinery |
| A | 13 mm | 8 mm | 11 mm | General industrial drives, pumps, agricultural equipment |
| B | 17 mm | 11 mm | 14 mm | Medium-duty drives, compressors, machine tools |
| C | 22 mm | 14 mm | 19 mm | Heavier drives, conveyors, crushers, larger pumps |
| D | 32 mm | 19 mm | 27 mm | Heavy-duty plant equipment and large drives |
| E | 38 mm | 23 mm | 32 mm | Extra heavy-duty industrial drives |
Classical section notes
- These sections are widely used where the belt groove and pulley family follow classical dimensions.
- Width and height both matter when checking the replacement belt.
- A close length match does not confirm the correct section.
Wedge Belt Sections
Wedge belts use a deeper, more compact profile. The wedge shape can improve grip in suitable pulley grooves and is common in many industrial applications.
| Section | Top width | Height | Approximate pitch width | Common applications |
|---|---|---|---|---|
| SPZ | 10 mm | 8 mm | 8.5 mm | Small pulley drives, compact machinery |
| SPA | 13 mm | 10 mm | 11 mm | General wedge drives, light industrial use |
| SPB | 17 mm | 14 mm | 14 mm | Medium-duty industrial machinery |
| SPC | 22 mm | 18 mm | 19 mm | Larger wedge drives, conveyors, plant equipment |
Wedge profile advantages
- Better grip in suitable grooves than a flat or mismatched section.
- Compact shape for drives that need efficient power transmission.
- Common in industrial systems where pulley design is specified for wedge profiles.
Narrow V-Belt Sections
Narrow sections are designed for higher power transmission in a more compact profile. They are often used where space is limited or where the drive needs a more efficient belt family.
| Section | Top width | Height | Approximate pitch width | Common applications |
|---|---|---|---|---|
| 3V | 9.5 mm | 8 mm | 9.5 mm | Compact industrial drives, smaller high-efficiency systems |
| 5V | 15.9 mm | 13 mm | 15.9 mm | Medium-power compact drives |
| 8V | 25.4 mm | 23 mm | 25.4 mm | Large high-power industrial drives |
Narrow sections are useful when a compact belt must carry more power than a classical profile of similar width.
V-Belt Section Comparison Table
The table below gives a clean reference view of the main belt families and their approximate dimensions.
| Section | Width | Height | Belt family | Approximate applications |
|---|---|---|---|---|
| Z | 10 mm | 6 mm | Classical | Light drives |
| A | 13 mm | 8 mm | Classical | General industrial use |
| B | 17 mm | 11 mm | Classical | Medium-duty machinery |
| C | 22 mm | 14 mm | Classical | Heavy-duty equipment |
| D | 32 mm | 19 mm | Classical | Large industrial drives |
| E | 38 mm | 23 mm | Classical | Very heavy drives |
| SPZ | 10 mm | 8 mm | Wedge | Small wedge drives |
| SPA | 13 mm | 10 mm | Wedge | General wedge applications |
| SPB | 17 mm | 14 mm | Wedge | Medium wedge drives |
| SPC | 22 mm | 18 mm | Wedge | Larger wedge systems |
| 3V | 9.5 mm | 8 mm | Narrow | Compact high-efficiency drives |
| 5V | 15.9 mm | 13 mm | Narrow | Medium-power compact drives |
| 8V | 25.4 mm | 23 mm | Narrow | High-power industrial drives |
How to Identify Belt Sections
Measure the width
Start with the top width. It is one of the most useful first checks when identifying the belt section.
Measure the height
Section height is important because several profiles can have similar widths but different heights.
Read the printed markings
Printed codes such as A45, SPA1250, B72, or 5V900 usually give the fastest clue to the section family.
Avoid common mistakes
- Measuring a worn belt and assuming the result is the original size.
- Checking only width and ignoring height.
- Confusing classical and wedge profiles that look similar.
- Assuming the pulley will accept any belt that is close in size.
Common V-Belt Applications
V-belt sections are used across many industrial and automotive drives. Common examples include industrial machinery, compressors, textile industry equipment, agricultural machines, and automotive systems.
For section checking, buyers can also use the practical tools on GM Traders such as the V-Belt Section Identifier and the Belt Length Converter.
Common Mistakes
- Confusing SPA and A section.
- Measuring worn belts without confirming the marking.
- Ignoring pulley compatibility.
- Ordering by width only and skipping the belt family check.
Practical Examples
Example 1
A belt with about 13 mm top width and 8 mm height may indicate A section, especially when the printed marking and pulley profile support that result.
Example 2
A belt with about 17 mm top width and a wedge profile may indicate SPB, depending on the printed marking and actual groove fit.
Why Section Identification Matters
Correct section selection affects pulley fit, slippage, heat, and belt life. A belt that is wrong in section can still look close enough to confuse a buyer, but it may not perform correctly in the drive.
Visual placeholders
- Section profile diagrams
- Pulley diagrams
- Section comparison illustrations
Internal links
Related resources:
What to confirm before inquiry
- • Old belt marking
- • Profile or section
- • Machine or vehicle application
- • Quantity and delivery city
Frequently asked questions
What is the difference between SPA and A section?
SPA is a wedge belt section with a narrower profile and different pulley geometry, while A is a classical section. They are not interchangeable by width alone.
Can different sections use the same pulley?
No. A pulley groove must match the belt section closely for proper fit and life.
Why does width matter?
Width affects pulley contact, groove fit, and the section family the belt belongs to.
Why do old belts measure differently?
Old belts can stretch, wear, or deform, so the measured size may differ from the original specification.
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Need help matching the correct size?
Send the exact belt marking to GM Traders and we will help confirm the right reference before supply.