What is a Bill of Materials or BoM?

A Bill of Materials commonly referred to as a BoM, is a complete list of parts that are required to create a finished product. It often has additional information such as supplier, cost, and quantity.

A BoM Includes…

A Bill of Materials is a comprehensive list of all the parts that are required to produce a finished product which is generally constructed layers or hierarchy consisting of top-level assemblies then sub-assemblies and finally individual components. The BoM should include the following important points:

  • BOM Level – This indicates the level of the assembly or part within the hierarchy
  • Part Number – Every element of the BOM needs to have a unique part number including assemblies and sub-assemblies.
  • Revision – This indicates what revision level is currently being used in production
  • Part Name – this is the short form name of each part or assembly
  • Description – This is the part or assembly description which gives more detail about the part
  • Quantity – Each part can be used a number of times in the assembly, each part needs to be listed in the correct assembly and the quantity is shown for each assembly
  • Unit of Measure – This defines the measure in which each part is to be used or purchased, for example, each, kg, drops.

Other options fields could include:

  • Type – This defines is a part is made in house, purchased off the shelf as a standard part or sub-contracted out for manufacture
  • Part Reference – This can be used to identify where a part is used or the type of part it is, for example, PCBA, Hardware, Code
  • Notes – This is just an area against each part where specific notes can be added which can help those using the BoM
  • Price – The current purchase price

Example of a BoM

example of a bill of materials

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