ASSEMBLY & COMPONENT CONTROL
Bill of materials (BOM)
A bill of materials specifies the components and quantities required to make or assemble a defined output. Units, revisions and effective conditions determine which component requirements apply.
BILL OF MATERIALS IN PRACTICE
- Define the outputIdentify the finished item and applicable version.
- Expand requirementsMultiply each component by the output quantity.
- Reconcile productionRecord actual consumption and finished output.
Use the agreed units, actual records and approved procedures for your operation.
A WORKED EXAMPLE
50 kits need 100 A and 50 B.
An approved BOM calls for two units of component A and one unit of component B per kit. Fifty kits therefore require 100 A and 50 B before any stated allowance. A stock total of 150 mixed components does not establish that 50 kits can be made: the individual component quantities must be sufficient. A later revision changing B must be controlled separately from the earlier version.
WHAT THIS MEANS FOR YOUR QUOTE
Agree the requirement before comparing quotes
Use the actual shipment, stock and service requirements. Record the billing unit, included work and responsibility for exceptions.
A LITTLE MORE CONTEXT
Questions about Bill of materials
Is a BOM just a list of product names?
No. Reliable execution needs component identities, quantities, units and relevant version information.
Does a BOM define the manufacturing sequence?
Not necessarily. Routing or work instructions usually describe the sequence and resources separately.
Can packaging materials be components?
Yes, when they are part of the defined assembly or packaging specification.
Source & example notes
Microsoft Learn: bills of materials and formulas.
Sources provide background on the linked topic. Product documentation describes a particular implementation; confirm the rules, contract and procedures that apply to your operation.
Quantities, costs and scenarios are illustrative, not operating targets, approved handling instructions or guarantees. Source guidance reviewed 22 October 2026.
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