Bolt Tension Capacity Calculator
Design tensile strength of a bolt — hangers, end plates, uplift anchors.
M16-8.8 holds ~90 kN design tension. Prying action in flexible end plates can add 30–60% hidden bolt force — stiffen the plate or thicken the math.
Formula
Bolt Tension Capacity Calculator is a free bolt tension capacity for structural engineers, fabricators and site engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Bolt Tension Capacity Calculator
Design tensile strength of a bolt — hangers, end plates, uplift anchors. The calculation implements T_db = 0.9·f_ub·A_n / 1.25 (IS 800:2007 cl. 10.3.5). M16-8.8 holds ~90 kN design tension. Prying action in flexible end plates can add 30–60% hidden bolt force — stiffen the plate or thicken the math.
How to use Bolt Tension Capacity Calculator
- 1Enter Bolt diameter in mm.
- 2Enter Bolt grade f_ub in MPa.
- 3Read Design tension capacity, Net tensile area instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Bolt Tension Capacity Calculator?
- ✓Implements the standard formula — T_db = 0.9·f_ub·A_n / 1.25
- ✓Reference cited on-page: IS 800:2007 cl. 10.3.5
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Bolt Tension Capacity Calculator use?+
It computes T_db = 0.9·f_ub·A_n / 1.25, per IS 800:2007 cl. 10.3.5. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
M16-8.8 holds ~90 kN design tension. Prying action in flexible end plates can add 30–60% hidden bolt force — stiffen the plate or thicken the math.
Can I use this for real structural design?+
It implements the exact textbook/code formula cited below the result and is ideal for sizing, checking and learning. Final designs should be verified by a qualified engineer against the full code with all load cases.
Is the Bolt Tension Capacity Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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