Fastening, Torque & Joint Assembly worked example

Fastening Defect Rate at 0.23% target fastening defect rate: a worked example

This scenario runs the fastening defect rate calculation on the strong side: 0.23% target fastening defect rate, with every other input held at its documented default. Use it when tracking cross-threading, stripped threads, wrong torque, missing fasteners, wrong screws, damaged heads, or washer defects.

The inputs for this scenario

  • Observed fastening defects: 7 defects (unchanged)
  • Inspected fastened joints or assemblies: 2,500 joints or assemblies (unchanged)
  • Target fastening defect rate: 0.23 % (raised for this scenario; the documented default is 0.2)

Working through the calculation

  • Applying the documented formula (Fastening defect rate = observed fastening defects รท inspected fastened joints or assemblies) to the inputs above produces each figure below.
  • At this operating point the engine returns 0.28 % for fastening defect rate, the number this scenario is built around.
  • At this operating point the engine returns -0.05 points for gap to defect-rate target.
  • At this operating point the engine returns 7 defects for observed fastening defects.
  • At this operating point the engine returns 2,500 joints or assemblies for inspected population.

How this compares with the baseline

  • Against the tool's baseline example, where target fastening defect rate sits at 0.2% and the headline result is 0.28 %, this scenario lands almost exactly on the baseline at 0.28 %.
  • Use it after a shift, lot, or audit of error-proofed and manually torqued joints to quantify fastening quality per station, tool, or part number. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Fastening defect rate: 0.28 % (headline result)
  • Gap to defect-rate target: -0.05 points
  • Observed fastening defects: 7 defects
  • Inspected population: 2,500 joints or assemblies

Run it with your numbers

  • Every input above is editable in the live Fastening Defect Rate calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.