![]() The phrase "bill of material" (or "BOM") is frequently used by engineers attributively to refer not to the literal bill, but to the current production configuration of a product, to distinguish it from modified or improved versions under study or in test. In process industries, the BOM is also known as the formula, recipe, or ingredients list. The different types depend on the business need and use for which they are intended. There are two types of bill materials.Ī BOM can define products as they are designed ( engineering bill of materials), as they are ordered (sales bill of materials), as they are built ( manufacturing bill of materials), or as they are maintained (service bill of materials). ![]() A bill of materials is often tied to a production order whose issuance may generate reservations for components in the bill of materials that are in stock and requisitions for components that are not in stock. A BOM may be used for communication between manufacturing partners or confined to a single manufacturing plant. ![]() ![]() An example of a BOM for a mechanical assembly (in German)Ī bill of materials or product structure (sometimes bill of material, BOM or associated list) is a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, parts, and the quantities of each needed to manufacture an end product. ![]()
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