EngiRef / UNC Bolt Specification
3/8-16
3/8-16 coarse UNC bolt: 16 threads per inch, 9.53 mm major diameter. Tensile stress area 50 mm² per ASME B1.1. Takes a 14.29 mm wrench. Free imperial fastener…
Specification
- Size
- 3/8-16
- Threads per inch (TPI)
- 16
- Major diameter D (mm)
- 9.53
- Minor diameter D₁ (mm, internal thread)
- 7.8
- Tensile stress area (mm²)
- 50
- Wrench size (mm)
- 14.29
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.