EngiRef / UNC Bolt Specification
#6-32
#6-32 coarse UNC bolt: 32 threads per inch, 3.51 mm major diameter. Tensile stress area 5.86 mm² per ASME B1.1. Takes a 6.35 mm wrench. Free imperial fastener…
Specification
- Size
- #6-32
- Threads per inch (TPI)
- 32
- Major diameter D (mm)
- 3.51
- Minor diameter D₁ (mm, internal thread)
- 2.49
- Tensile stress area (mm²)
- 5.86
- Wrench size (mm)
- 6.35
Tensile stress area follows ASME B1.1, At = 0.7854(D − 0.9743/n)² in², converted at 645.16 mm²/in². Verify against the current standard and the fastener manufacturer's data before safety-critical design.