EngiRef / UNC Bolt Specification
9/16-12
9/16-12 coarse UNC bolt: 12 threads per inch, 14.29 mm major diameter. Tensile stress area 117 mm² per ASME B1.1. Takes a 21.43 mm wrench. Free imperial…
Specification
- Size
- 9/16-12
- Threads per inch (TPI)
- 12
- Major diameter D (mm)
- 14.29
- Minor diameter D₁ (mm, internal thread)
- 12.02
- Tensile stress area (mm²)
- 117
- Wrench size (mm)
- 21.43
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.