Bolt Tensile Stress
Bolt Tensile Stress
A bolt in tension is checked on its tensile stress area — the reduced area through the threads, not the shank.
The tensile stress is σ = F/A_t. where F is the tension and A_t the tensile stress area.
Inputs
F := 30 kN=30000 N
A_t := 157 mm^2=1.57e-04 m^2
Divide the tension by the tensile stress area.
sigma := F/A_t=191.08 MPa
Results
The stress must stay below the bolt grade’s proof stress. Using the thread stress area, not the nominal shank area, keeps the check conservative.
Assumptions & limitations
- Tensile stress area (through threads).
- Concentric tension.
- No prying action included.