Fastening, Torque & Joint Assembly worked example

Fastener Cost Per Unit at 74% usage, scrap, or overage factor: a worked example

Suppose usage, scrap, or overage factor falls to 74%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate fastener cost for an assembly scope from fastener count, purchased price, usage factor, and fixed sourcing or handling charges.

The inputs for this scenario

  • Fasteners used in assembly scope: 36 pieces (held at the documented default)
  • Purchased fastener price: 0.18 $ / piece (held at the documented default)
  • Usage, scrap, or overage factor: 74 % (the input this scenario stresses; the baseline uses 103)
  • Fixed sourcing or handling cost: 12 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable fastener cost = fasteners used × purchased fastener price × usage factor.
  • Total fastener cost for scope works out to 16.8 $ at these inputs, and this is the headline figure for the scenario.
  • Average cost per entered fastener works out to 0.47 $ / piece at these inputs.
  • Variable purchased fastener cost works out to 4.8 $ at these inputs.
  • Fixed sourcing/handling cost works out to 12 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where usage, scrap, or overage factor sits at 103% and the headline result is 18.67 $, this scenario comes in 10.06% below the baseline at 16.8 $.
  • It computes total fastener cost by multiplying piece count by purchased price and a usage/scrap factor, then adding a fixed sourcing or handling cost, and reports the average cost per entered fastener. 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

  • Total fastener cost for scope: 16.8 $ (headline result)
  • Average cost per entered fastener: 0.47 $ / piece
  • Variable purchased fastener cost: 4.8 $
  • Fixed sourcing/handling cost: 12 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Fastener Cost Per Unit calculator, set usage, scrap, or overage factor to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.