Fastening, Torque & Joint Assembly worked example

Fastener Inventory Days at 99% line-side inventory availability: a worked example

This scenario runs the fastener inventory days calculation on the strong side: 99% line-side inventory availability, with every other input held at its documented default. Use it when checking whether screws, bolts, nuts, washers, rivets, or inserts staged at the line can cover the planned assembly window.

The inputs for this scenario

  • Fasteners per kit or line-side container: 500 pieces / kit (unchanged)
  • Planned kits or containers available: 12 kits (unchanged)
  • Line-side inventory availability: 99 % (raised for this scenario; the documented default is 95)
  • Usable fastener inventory yield: 98 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross staged fasteners = fasteners per kit × planned kits) to the inputs above produces each figure below.
  • At this operating point the engine returns 5,821 units for good output capacity, the number this scenario is built around.
  • At this operating point the engine returns 6,000 units for gross staged fasteners.
  • At this operating point the engine returns 60 units for availability loss.
  • At this operating point the engine returns 119 units for inventory yield loss.

How this compares with the baseline

  • Against the tool's baseline example, where line-side inventory availability sits at 95% and the headline result is 5,586 units, this scenario comes in 4.21% above the baseline at 5,821 units.
  • Use it for line-side replenishment planning, kanban sizing, or verifying that staged fasteners cover a shift's demand. 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

  • Good output capacity: 5,821 units (headline result)
  • Gross staged fasteners: 6,000 units
  • Availability loss: 60 units
  • Inventory yield loss: 119 units

Run it with your numbers

  • Every input above is editable in the live Fastener Inventory Days calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.