Fastening, Torque & Joint Assembly worked example

Joint Failure Risk with joint failure severity score of 4 score: a worked example

Suppose joint failure severity score falls to 4 score. This page works the full calculation at that level so you can see exactly which result moves and by how much. Score fastened-joint failure risk from severity, occurrence, and detection ratings for FMEA or corrective-action ranking.

The inputs for this scenario

  • Joint failure severity score: 4 score (the input this scenario stresses; the baseline uses 8)
  • Joint failure occurrence score: 4 score (held at the documented default)
  • Joint failure detection score: 5 score (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Weighted joint failure risk score = severity × 0.40 + occurrence × 0.35 + detection × 0.25.
  • Weighted joint failure risk score works out to 4.25 score at these inputs, and this is the headline figure for the scenario.
  • Failure severity score works out to 4 score at these inputs.
  • Failure occurrence score works out to 4 score at these inputs.
  • Detection weakness score works out to 5 score at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where joint failure severity score sits at 8 score and the headline result is 5.85 score, this scenario comes in 27.35% below the baseline at 4.25 score.
  • It computes a single weighted risk score for a fastening failure mode by combining severity at 40 percent, occurrence at 35 percent, and detection at 25 percent. 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

  • Weighted joint failure risk score: 4.25 score (headline result)
  • Failure severity score: 4 score
  • Failure occurrence score: 4 score
  • Detection weakness score: 5 score

Run it with your numbers

  • To rerun this with your own numbers, open the live Joint Failure Risk calculator, set joint failure severity score to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.