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Types of bills of materials or BOM’s

Types of bills of materials or BOM's

Types of bills of materials

There are three main types of BOM’s:

Manufacturing Bill of Materials. A manufacturing BOM (MBOM) includes a structured list of all the items or subassemblies required to make a manufactured, shippable finished product. An MBOM, in addition to the information on individual parts, also includes information on the parts that require processing prior to assembly and explains how various components relate to one another in a product. The information in the MBOM is then shared with all the integrated business systems involved in ordering and building the product, including enterprise resource planning (ERP), material requirements planning (MRP) and, in some cases, a manufacturing execution system (MES).

Engineering Bill of Materials. An engineering BOM (EBOM) defines assemblies or parts as designed by the engineering department. Showing the component structure from a functional perspective, an EBOM, for example, will consist of a mechanical or technical drawing of a product. An EBOM is typically developed by engineers using computer-aided design (CAD) or electronic design automation (EDA) tools, and it is common to have more than one EBOM for a product as the design undergoes a series of revisions.

Sales Bill of Materials. A sales BOM (SBOM) defines a product in the sales stage, meaning details of the product prior to assembly. In an SBOM, the list of finished products and the components required to develop it appear separately in the sales order document. Here, the finished product is managed as a sales item instead of an inventory item.

It’s important to note that each type of BOM will involve a different structure and level of detail. For example, an EBOM may list parts related to a specific function of the product, such as chips for a circuit board. An MBOM, by definition, lists every material that goes into manufacturing a product.

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