Fire & Finish — Galvanized Nut Overtap Fit
Galvanized Nut Overtap Fit for steel fire protection and finishing.
Galvanized nuts are tapped OVERSIZE after coating so they spin on a coated bolt — the strength lives in the bolt's threads, and the system is only sold as matched sets. Mixing a galvanized bolt with a black nut (or vice versa) either seizes or strips; the gang box mixes them weekly anyway.
Formula
Note: Erection-planning estimate only. Member weights, connection capacities and tolerances for execution must come from the issued drawings, the EOR and the erection engineer — never from a generic calculator.
Galvanized Nut Overtap Fit for steel fire protection and finishing. A free structural steel delivery & erection tool — no sign-up, no upload, instant results in your browser.
About Fire & Finish — Galvanized Nut Overtap Fit
Fire & Finish — Galvanized Nut Overtap Fit computes the governing relationship overtap ≈ 4 × coating thickness (diametral) live as you type. Galvanized nuts are tapped OVERSIZE after coating so they spin on a coated bolt — the strength lives in the bolt's threads, and the system is only sold as matched sets. Mixing a galvanized bolt with a black nut (or vice versa) either seizes or strips; the gang box mixes them weekly anyway. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Fire & Finish — Galvanized Nut Overtap Fit
- 1Enter your values — Bolt diameter, Zinc coating thickness (sensible defaults are pre-filled).
- 2Read the live results: Nut overtap allowance.
- 3Check the "with your numbers" line to see overtap ≈ 4 × coating thickness (diametral) substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Fire & Finish — Galvanized Nut Overtap Fit?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula overtap ≈ 4 × coating thickness (diametral) with authoritative sources cited on the page (AISC 303 — Code of Standard Practice for Steel Buildings; ASTM A780 / UL fire-resistance directory)
- ✓Galvanized nuts are tapped OVERSIZE after coating so they spin on a coated bolt — the strength lives in the bolt's threads, and the system is only sold as matched sets.
- ✓Niche-specific defaults give a meaningful worked answer the moment the page loads
Frequently asked questions
What formula does the fire & finish — galvanized nut overtap fit use?+
It evaluates overtap ≈ 4 × coating thickness (diametral), exactly as published. Sources: AISC 303 — Code of Standard Practice for Steel Buildings; ASTM A780 / UL fire-resistance directory. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Galvanized nuts are tapped OVERSIZE after coating so they spin on a coated bolt — the strength lives in the bolt's threads, and the system is only sold as matched sets. Erection-planning estimate only. Member weights, connection capacities and tolerances for execution must come from the issued drawings, the EOR and the erection engineer — never from a generic calculator.
When is this calculator the right tool for the job?+
Galvanized Nut Overtap Fit for steel fire protection and finishing. A free structural steel delivery & erection tool. Mixing a galvanized bolt with a black nut (or vice versa) either seizes or strips; the gang box mixes them weekly anyway. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Do I need to install anything or create an account?+
No. The tool is pure client-side JavaScript: open the page and it works, offline once loaded, with no account, no quota and no data leaving your device.
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