Fastener Manufacturing & Thread Rolling worked example

Coating Thickness Margin with measured coating thickness of 5 µm: a worked example

Suppose measured coating thickness falls to 5 µm. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate coating thickness margin by comparing measured plating or coating thickness with the required minimum.

The inputs for this scenario

  • Measured coating thickness: 5 µm (the input this scenario stresses; the baseline uses 10)
  • Required minimum coating thickness: 8 µm (held at the documented default)
  • Reference coating requirement: 8 µm (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Coating thickness margin = measured coating thickness - required minimum coating thickness.
  • Coating thickness margin works out to -37.5 % at these inputs, and this is the headline figure for the scenario.
  • Thickness above minimum works out to -3 µm at these inputs.
  • Measured thickness works out to 5 µm at these inputs.
  • Required minimum works out to 8 µm at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where measured coating thickness sits at 10 µm and the headline result is 25 %, this scenario comes in 250% below the baseline at -37.5 %.
  • It computes the coating thickness above your required minimum and expresses that surplus as a percentage of the reference coating requirement. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Coating thickness margin: -37.5 % (headline result)
  • Thickness above minimum: -3 µm
  • Measured thickness: 5 µm
  • Required minimum: 8 µm

Run it with your numbers

  • To rerun this with your own numbers, open the live Coating Thickness Margin calculator, set measured coating thickness to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.