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Engineering BOM and Manufacturing BOM

Engineering Bill of Material (EBOM)

EBOM is created in Engineering phase, are typically driven from the CAD tools and are usually centric to the final assembly list of parts or components that make up the as designed or EBOM. EBOM is a list of all of the parts in the a product’s design of a product. As it is specific to the design and will not necessarily list all of the components and materials needed to manufacture a product.

An engineering bill of materials (EBOM) should include a list of parts, components, and materials and detailed engineering information such as specifications, tolerances, and standards.

  • Organized with regards to how the product is designed

  • List of all the parts in the product’s design

  • Includes a list of parts, components, and materials

  • Also includes detailed engineering information such as specifications, tolerances, and standards

Manufacturing Bill of Material (MBOM)

MBOM is driven by the EBOM. MBOM's make up the end item, or product as shipped. MBOM is the recipe or road map for manufacturing any physical product. The MBOM is organized to support the assembly. It includes any details and materials needed to build, assemble, and package the product.

  • The roadmap for manufacturing any physical product

  • It will contain or be driven by the eBOM

  • Is a configuration of the product to show it will be assembled

  • Includes any details and materials needed to build, assemble, and package your product

  • Also includes information about how the parts relate to one another

The major differences between EBOM and MBOM are in their structure and depth. MBOMs must contain all the parts and assemblies. If an item needs to be purchased, processed or inventoried to make the product then it needs to be represented on the MBOM. The EBOM may not provide any information about how parts relate to each other, while that is the main purpose of an MBOM.



  • The EBOM represents the engineering (design) view of a product, structured in a way that it represents the multidisciplinary view of the functional definition of the product. The EBOM combined with its related specification documents, models, drawings, annotations should give a 100 % clear definition of the product.

  • The MBOM represents the manufacturing view of a product, structured in a way that represents the way the product is manufactured. This structure is most of the time not the same as the EBOM, due to the manufacturing process and purchasing of parts.