mBOM (Manufacturing BOM)
The Manufacturing Bill of Materials (mBOM) is the structured list of parts, subassemblies, and consumables that defines how a product is built, organized the way the shop floor builds it — by assembly sequence, work center, and process step. The mBOM is owned by manufacturing engineering and consumed by ERP for procurement and by MES for shop-floor execution. It is structurally different from the eBOM, not a different view of it: it carries phantom assemblies, kits, scrap factors, and routing references that have no place in the eBOM.
Why it matters
The mBOM is the document that the line actually builds against. It is the bridge between engineering's design intent and the physical execution of that intent at a station, by an operator, against a routing. When the mBOM is reliably derived from the eBOM with documented translation, an engineering change reaches the line in a predictable number of steps; when it is not, manufacturing maintains a parallel BOM and engineering changes never propagate.
Related concepts
External References
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Cite this definition
Finocchiaro, Michael. “mBOM (Manufacturing BOM).” DemystifyingPLM PLM Glossary, 2026, https://www.demystifyingplm.com/glossary/mbom-manufacturing-bom