Doors, Hardware & Access Control Manufacturing worked example

Custom Order Lead Time with daily custom opening or hardware demand of 600 openings or sets / day: a worked example in doors, hardware & access control manufacturing

Here is what the math looks like when conditions slip. We hold every other input steady and drop daily custom opening or hardware demand to 600 openings or sets / day, then walk the calculation through step by step. Estimate required inventory or order coverage for custom doors, frames, hardware sets, cylinders, finish options, or access-control components with long lead times.

The inputs for this scenario

  • Daily custom opening or hardware demand: 600 openings or sets / day (the input this scenario stresses; the baseline uses 1,200)
  • Custom order replenishment lead time: 85 days (held at the documented default)
  • Schedule-change safety buffer: 1.1 openings or sets (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Lead-time demand coverage = daily custom opening or hardware demand × custom order replenishment lead time.
  • Protected days of supply works out to 6.42 openings or sets at these inputs, and this is the headline figure for the scenario.
  • Unprotected days works out to 7.06 days at these inputs.
  • Inventory works out to 600 pieces at these inputs.
  • Daily usage works out to 85 pieces / day at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where daily custom opening or hardware demand sits at 1,200 openings or sets / day and the headline result is 12.83 openings or sets, this scenario comes in 50% below the baseline at 6.42 openings or sets.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to daily custom opening or hardware demand, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes steady daily demand; custom door work is lumpy by nature, so a single large opening release can consume coverage far faster than the average day implies.

Results at a glance

  • Protected days of supply: 6.42 openings or sets (headline result)
  • Unprotected days: 7.06 days
  • Inventory: 600 pieces
  • Daily usage: 85 pieces / day

Run it with your numbers

  • To rerun this with your own numbers, open the live Custom Order Lead Time calculator, set daily custom opening or hardware demand to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.