What the Calculator Covers
This calculator assesses a screw loaded in axial tension in an aluminium connection. It uses the screw diameter and selected resistance basis to compare the applied force with the available tensile resistance.
Typical Inputs
Enter the applied tensile force, screw diameter, number of screws where relevant, selected resistance basis and the applicable partial factor.
EN 1999 Aluminium Connection Context
The tensile resistance of a screw is not the capacity of the whole connection. Screw shear and pull-out, bearing, spacing, edge distance, local sheet behaviour and combined actions may also govern.
Diameter-Derived Tensile Area
The tool uses screw diameter to derive the tensile area used in the check. The selected diameter should match the fastener used in the physical connection detail and project specification.
Result Review
The engineering tool reports resistance, utilization, and pass/fail status so the aluminium screw tension check can be reviewed clearly. The output is for preliminary engineering review and should not replace a full connection design by a qualified engineer.
Screw Tension and Pull-out Difference
Screw tension checks the fastener tensile resistance, while screw pull-out checks the supporting aluminium material around the engaged thread. Both may be relevant for the same connection.
Frequently Asked Questions
What is screw tension in an aluminium connection?
Screw tension checks whether the screw has enough tensile resistance for an axial pull or tension force in the connection.
What inputs are usually needed for aluminium screw tension?
Typical inputs include applied tensile force, screw diameter, number of fasteners where relevant, and the resistance factors used by the design basis.
Is screw tension the same as screw pull-out?
No. Screw tension checks the screw itself, while screw pull-out checks the supporting aluminium around the engaged thread.
Can screw shear and screw tension act together?
Yes. Some connections may need combined-action review where shear and tension act together, depending on the project detail and design basis.
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.