Fastening, Torque & Joint Assembly worked example

Joint Failure Risk with joint failure severity score of 20 score: a worked example

Push joint failure severity score up to 20 score and the picture changes. This example computes every intermediate figure at that operating point. Use it when ranking loose joints, stripped threads, cross-threading, gasket leaks, clamp-load loss, or torque-control gaps.

The inputs for this scenario

  • Joint failure severity score: 20 score (raised for this scenario; the documented default is 8)
  • Joint failure occurrence score: 4 score (unchanged)
  • Joint failure detection score: 5 score (unchanged)

Working through the calculation

  • Applying the documented formula (Weighted joint failure risk score = severity × 0.40 + occurrence × 0.35 + detection × 0.25) to the inputs above produces each figure below.
  • At this operating point the engine returns 10.65 score for weighted joint failure risk score, the number this scenario is built around.
  • At this operating point the engine returns 20 score for failure severity score.
  • At this operating point the engine returns 4 score for failure occurrence score.
  • At this operating point the engine returns 5 score for detection weakness score.

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 82.05% above the baseline at 10.65 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. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Weighted joint failure risk score: 10.65 score (headline result)
  • Failure severity score: 20 score
  • Failure occurrence score: 4 score
  • Detection weakness score: 5 score

Run it with your numbers

  • Every input above is editable in the live Joint Failure Risk calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.