Released On 26th May 2026
Metric vs Imperial Bolts
Metric and imperial bolts use different measurement systems and thread standards.
Metric bolts
Measurements use:
- Millimetres
- Thread pitch
- Metric diameters
Example:
M10 × 50
Imperial bolts
Measurements use:
- Inches
- Threads per inch (TPI)
Example:
3/8"-16
Key differences
| Metric | Imperial |
| Millimetres | Inches |
| Pitch spacing | Threads per inch |
| M8, M10 etc | 1/4", 3/8" etc |
FAQ
Can metric and imperial bolts be used together?
No. Thread forms differ and are generally incompatible.
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