M8 thread dimensions
ISO 261 (coarse) · Parallel · 60°
Dimensions
- Major diameter
- 8.000 mm0.3150 in
- Pitch
- 1.250 mmmetric, no TPI
- Minor diameter
- 6.647 mmbasic profile, before tolerances
- Thread height
- 0.677 mmbasic profile, before tolerances
- Tap drill
- 6.75 mmcommon practice: diameter minus pitch
- Standard
- ISO 261 (coarse)
- Form
- Parallel
- Flank angle
- 60°
- Seals on
- Sealing ring
- Used for
- Process connections
Thread profile
Schematic: flank angle and pitch-to-depth proportions to scale.
Easily confused with
| Thread | Standard | Major diameter | Flank | Seals on |
|---|---|---|---|---|
| M8×1 | ISO 261 | same diameter; pitch 1.000 mm | 60° | Sealing ring |
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