What the Calculator Covers
This calculator compares the applied withdrawal force with the pull-out resistance developed by the engaged thread in the aluminium support. The result depends on the screw geometry, supporting thickness, and material strength.
Typical Inputs
Common inputs include the applied tensile pull-out force, screw diameter, thread pitch or relevant screw geometry, supporting sheet thickness, aluminium material strength, and any validity limits shown by the tool.
EN 1999 Aluminium Connection Context
Pull-out resistance depends on the screw and the supporting aluminium. It should be considered alongside screw shear and tension, bearing, spacing, edge distance, local sheet behaviour and the fabrication requirements for the connection.
Supporting Thickness and Validity
Pull-out resistance is sensitive to supporting material thickness, screw engagement, thread geometry, and the selected material basis. Any visible warnings should be reviewed before carrying the result into a wider design decision.
Result Review
The engineering tool reports resistance, utilization, warnings, and pass/fail status so the aluminium screw pull-out check can be reviewed clearly. The output is for preliminary engineering review and should not replace a full connection design by a qualified engineer.
Aluminium and Steel Difference
Screw pull-out in aluminium and screw pull-out in steel may look similar as a resistance mechanism, but the design basis is different. Aluminium pull-out is reviewed with EN 1999 assumptions, while steel pull-out is reviewed with EN 1993 assumptions.
Frequently Asked Questions
What is screw pull-out?
Screw pull-out checks whether the supporting material has enough resistance against a screw being pulled out under tensile withdrawal force.
What inputs are usually needed for aluminium screw pull-out?
Typical inputs include applied pull-out force, screw diameter, thread pitch or screw geometry, supporting thickness, aluminium material strength, and the relevant design basis.
Is screw pull-out the same as screw tension?
No. Screw tension checks the tensile resistance of the screw itself, while screw pull-out checks the resistance of the supporting material around the engaged thread.
Is aluminium screw pull-out checked the same way as steel screw pull-out?
No. The resistance mechanism is similar, but aluminium checks and steel checks use different material assumptions and code direction.
Engineering content is prepared and maintained by VitraLab Engineering. Worked examples show how the current calculator treats a defined case; they do not replace project-specific verification.