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Metric Thread Pitch Chart (ISO 261)
Metric thread pitch chart for ISO metric screw threads, with coarse and fine pitches and the usual tap drill for coarse threads.
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Metric thread sizes
| Size | Coarse pitch mm | Fine pitch mm | Tap drill mm (coarse) | Minor dia mm (external) | Pitch dia mm |
|---|---|---|---|---|---|
| M3 | 0.50 | 0.35 | 2.50 | 2.387 | 2.675 |
| M4 | 0.70 | 0.5 | 3.30 | 3.141 | 3.545 |
| M5 | 0.80 | 0.5 | 4.20 | 4.019 | 4.480 |
| M6 | 1.00 | 0.75 | 5.00 | 4.773 | 5.350 |
| M8 | 1.25 | 1.0 | 6.75 | 6.466 | 7.188 |
| M10 | 1.50 | 1.25, 1.0 | 8.50 | 8.160 | 9.026 |
| M12 | 1.75 | 1.5, 1.25 | 10.25 | 9.853 | 10.863 |
| M14 | 2.00 | 1.5 | 12.00 | 11.546 | 12.701 |
| M16 | 2.00 | 1.5 | 14.00 | 13.546 | 14.701 |
| M18 | 2.50 | 2.0, 1.5 | 15.50 | 14.933 | 16.376 |
| M20 | 2.50 | 2.0, 1.5 | 17.50 | 16.933 | 18.376 |
| M22 | 2.50 | 2.0, 1.5 | 19.50 | 18.933 | 20.376 |
| M24 | 3.00 | 2.0 | 21.00 | 20.319 | 22.051 |
| M27 | 3.00 | 2.0 | 24.00 | 23.319 | 25.051 |
| M30 | 3.50 | 2.0 | 26.50 | 25.706 | 27.727 |
| M33 | 3.50 | 2.0 | 29.50 | 28.706 | 30.727 |
| M36 | 4.00 | 3.0 | 32.00 | 31.093 | 33.402 |
| M42 | 4.50 | 3.0 | 37.50 | 36.479 | 39.077 |
| M48 | 5.00 | 3.0 | 43.00 | 41.866 | 44.752 |
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About this Table
Metric thread pitch chart for ISO metric screw threads, with coarse and fine pitches and the usual tap drill for coarse threads.
Basis: ISO 261 general plan and ISO 724 basic dimensions (60° thread). Tap drill = D − P; external minor diameter = D − 1.226869 P; pitch diameter = D − 0.649519 P.
How to use
- Measure the bolt diameter and pitch with a thread gauge.
- Coarse pitch is assumed when only Mxx is written.
- M20 × 1.5 is the standard metric cable gland and many instrument threads.
Notes
- Tap drill for fine pitch = D − fine pitch.
- Minor diameter shown is the basic external value; internal threads differ slightly.
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Frequently Asked Questions
What is the pitch of M10?
1.5 mm coarse; 1.25 or 1.0 mm fine.
What tap drill is used for M8?
6.8 mm (8 − 1.25).
What thread do metric cable glands use?
Usually M20 × 1.5, M25 × 1.5 and so on.
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Cable gland types and selection
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