Aluminum Extrusion & Profile Manufacturing worked example

Aluminum Extrusion Stretch Allowance Calculator with available as-extruded length of 130 ft: a worked example

This worked example runs the aluminum extrusion stretch allowance calculator numbers for a tougher week than the baseline: available as-extruded length of 130 ft instead of the typical 252 ft. Calculate stretch allowance margin by comparing available runout length, required finished length, and reference length for an aluminum profile.

The inputs for this scenario

  • Available as-extruded length: 130 ft (the input this scenario stresses; the baseline uses 252)
  • Required finished length: 240 ft (held at the documented default)
  • Reference finished length: 240 ft (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Available stretch and trim length = available as-extruded length - required finished length.
  • Stretch allowance margin works out to -45.83 % allowance at these inputs, and this is the headline figure for the scenario.
  • Available stretch and trim length works out to -110 ft at these inputs.
  • Available as-extruded length works out to 130 ft at these inputs.
  • Required finished length works out to 240 ft at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where available as-extruded length sits at 252 ft and the headline result is 5 % allowance, this scenario comes in 1,017% below the baseline at -45.83 % allowance.
  • Use it when setting up a run or checking that your puller and table length leave enough material above finished length for stretch and trimming. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Stretch allowance margin: -45.83 % allowance (headline result)
  • Available stretch and trim length: -110 ft
  • Available as-extruded length: 130 ft
  • Required finished length: 240 ft

Run it with your numbers

  • To rerun this with your own numbers, open the live Aluminum Extrusion Stretch Allowance Calculator calculator, set available as-extruded length to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.