About the Fastener Load Calculator
Tensile and shear capacity of a bolt, and the load shared across a group of fasteners.
Also known as: bolt strength calculator, bolt shear capacity, bolt tensile capacity, bolt group load.
How to use this calculator
- Enter bolt stress area, property class, number of bolts, safety factor and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
tensile capacity = stress area × tensile strength · shear ≈ 0.6 × tensile
Worked example
Using the values pre-filled in the calculator above:
- Bolt stress area = 58 mm²
- Property class: 8.8
- Number of bolts = 4
- Safety factor = 2
- Applied load (optional) = 20 kN
the calculator returns:
- Safe tensile load (group): 92.8 kN
- Safe shear load (group): 55.68 kN
- Ultimate tensile per bolt: 46.4 kN
- Proof load per bolt: 37.12 kN