EngiRef / Metric Bolt Specification
M27
M27 coarse-thread metric bolt: 3 mm pitch, 27 mm major diameter. Tensile stress area 459 mm² per ISO 898-1. Takes a 41 mm wrench. Free bolt specification table…
Specification
- Size
- M27
- Pitch (mm)
- 3
- Major diameter d (mm)
- 27
- Minor diameter d₃ (mm, external thread)
- 23.32
- Tensile stress area (mm²)
- 459
- Head height (mm)
- 17
- Head diameter (mm)
- 41
- Wrench size (mm)
- 41
Tensile stress area follows ISO 898-1, At = (π/4)(d − 0.9382p)². Verify against the current standard and the fastener manufacturer's data before safety-critical design.