BOM
A Bill of Materials (BOM) is the engineering and operational specification of a manufactured product — the hierarchical list of components, sub-assemblies, raw materials, and quantities required to produce one finished unit. BOMs drive material requirements planning (MRP), procurement, costing, and production scheduling.
Types include: Engineering BOM (EBOM) as designed; Manufacturing BOM (MBOM) as built (including consumables, packaging); Sales BOM for configurable products. Multi-level BOMs (parent → sub-assemblies → components) are essential for complex products.
The BOM is the recipe for a product — it drives what you buy (through MRP), what it costs, and how you build it. Get the BOM wrong and procurement, costing and production all inherit the error, which is why BOM accuracy sits upstream of almost every manufacturing decision.
product
What is the difference between an EBOM and an MBOM?
An Engineering BOM (EBOM) describes the product as designed; a Manufacturing BOM (MBOM) describes it as built — including consumables, packaging and the structure used on the shop floor.
What is a multi-level BOM?
A BOM with a hierarchy — parent product → sub-assemblies → components → raw materials — essential for complex products where sub-assemblies are made or bought separately.