Bill of Materials (BOM)

BOM...

Is a list of raw materials, components, sub-assemblies, sub-components, consumable parts and the quantities of each needed to manufacture an end product.

May be used for communication between manufacturing partners, or confined to a single manufacturing plant.

Can have other variable and specialized forms:

EBOM (Engineering BOM)
CBOM (Configurable or Sales BOM)
SBOM (Service BOM)


Are the base element of manufacturing Routers and Inventory Valuation

Elements of a BOM

BOMs contain, at a minimum, the following elements:

BOM Part Number
BOM Part Revision
BOM Part Description
BOM Cost (rolled up from cost of individual components)
Component(s) Part Number
Component(s) Part Revision
Component(s) Part Description
Component(s) Quantity Required to build one (1) BOM
Component(s) Cost per unit

Structure of a BOM

 
BOM may be either Single Level or Indented
 

Single Level BOM

 
BOM

Indented BOM

How To Compile a BOM

Understand what you're building. Look at it. Hold it. Be it.

List all parts. Be complete and detailed, even if you think it’s obvious what goes in the product.

Avoid creating multiple part numbers for the same item. A part number means one thing only.

Ensure that part numbers have a specification, drawing, data sheet, etc.

List exact quantities of each item.

Be consistent with the UOM (Unit Of Measure) (inch, feet, meters, ounces, etc.)

Include reference designators if appropriate. (usually on EBOMs)

Ensure the BOM corresponds exactly to assembly documents, routers, etc.

Include assembly documentation or a hyper-link to it.

This workforce solution by Chuck Sugent funded by Colorado Helps Advanced Manufacturing Programs (CHAMP) grant is licensed under a Creative Commons Attribution 4.0 International License. Based on a work at Emily Griffith Technical College. Permissions beyond the scope of this license may be available at http://www.emilygriffith.edu/.

 

This workforce product was funded by a grant awarded by the U.S. Department of Labor’s Employment and Training Administration. The product was created by the grantee and does not necessarily reflect the official position of the U.S. Department of Labor. The U.S. Department of Labor makes no guarantees, warranties, or assurances of any kind, express or implied, with respect to such information, including any information on linked sites and including, but not limited to, accuracy of the information or its completeness, timeliness, usefulness, adequacy, continued availability, or ownership.