VitraLab Aluminium Screw Tension Tool

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1. Code basis

Aluminium Supporting Sheet

Code basis: EN 1999-1-4 screw tension resistance expression for aluminium/steel supporting members, with visible diameter and area checks.

2. Screw and action

Input Values

Screw diameter, d (mm) Calculated A_s = πd²/4 (mm2) Partial factor, γ_M3 Total applied ULS tension (N) Number of screws

Warning: make sure the diameter entered is the correct effective screw diameter for this check. Confirm whether you are using threaded/root diameter or shank diameter from the manufacturer's datasheet.

3. Result

Tension Summary

Code basis EN 1999

A_s / γ_M3 -

Tension resistance, F_t,Rd -

Applied tension per screw -

Utilization -

Resistance status -

4. Formula notes

Visible Method

Calculated area: A_s = πd² / 4, with d in mm.
Tension resistance: Ft,Rd = 560 As / gamma M3 [N], with As in mm2.
This formula is shown as an aluminium-code screw check even though the screw is steel or stainless steel.

This calculation is provided for preliminary guidance only. VitraLab does not certify or approve the final design. All structural designs must be reviewed and approved by a qualified engineer before manufacture, installation, or use.