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What is a bill of materials BOM?

The different types depend on the business need and use for which they are intended. Creating an accurate bill of materials is vital because it ensures that parts are available when needed and that the assembly process is as efficient as possible. If the BOM is not accurate, it can cause production to halt, which increases operating costs, as time is needed to locate missing parts, start another production order, or determine the correct process of assembly.

A manufacturing bill of materials (BOM) comprises all the assemblies and parts required to construct a finished item ready to be shipped. It also incorporates the packaging materials required to send the product to the customer. It contains processes that require execution on the product prior to completion and stores all the information required for manufacturing activities. An engineering bill of materials defines the design of the finished product. It includes all alternative and substitute part numbers and parts contained in the drawing notes.

Common functions that utilize BOMs are engineering, design, operations, and manufacturing. The engineering BOM is often organized by engineers based on a computer-aided design (CAD) drawing. For a finished product, there may be more than one engineering BOM created. This website is using a security service to protect itself from online attacks.

Bill of Materials (BOM)

In a nutshell, it is the complete list of all the items that are required to build a product. This BOM approach requires more work to create but offers greater details and specificity on the parent and child parts in the product. And the product structure shows the relationship between the parent and child product, as well as assemblies and subassemblies.

It is a list of the items needed to create a product as well as the instructions on how to assemble that product. Manufacturers that build products start the assembly process by creating a BOM. BOMs also include the instructions for procuring and using the materials. A BOM is sometimes referred to as a product structure, assembly component list or production recipe (in process manufacturing industries). A bill of materials (BOM) is a comprehensive inventory of the raw materials, assemblies, subassemblies, parts and components, as well as the quantities of each needed to manufacture a product.

  • A manufacturing bill of materials (BOM) comprises all the assemblies and parts required to construct a finished item ready to be shipped.
  • A bill of materials (BOM) is an extensive list of raw materials, components, and instructions required to construct, manufacture, or repair a product or service.
  • When an item is a sub-component, of a (parent) component, it can in-turn have its own child components, and so on.
  • The first hierarchical databases were developed for automating bills of materials for manufacturing organizations in the early 1960s.
  • A bill of materials “implosion” links component pieces to a major assembly, while a bill of materials “explosion” breaks apart each assembly or sub-assembly into its component parts.

Learn more about enterprise resource planning and key features of ERP systems with this complete guide. For example, if a bicycle manufacturer wants to build 1,000 bicycles, the bill of materials will consist of all the individual parts needed to build the bicycle. The list would include the seats, frames, brakes, handlebars, wheels, tires, chains, pedals and cranksets, as well as the quantities of each component and their 25 best accounting firms for 2023 cost. BOMs can be created using physical products or a software-as-a-service bill of materials product. The advantage of using a bill of materials is streamlining and improving the efficiency of the manufacturing process by enabling detailed planning. A bill of materials can also help to reduce waste, identify vulnerabilities in a product’s components, and stay ahead of materials shortages or supply chain disruptions.

If a new product fails, a single-level BOM makes it difficult to determine which part needs to be replaced or repaired. BOMs are of hierarchical nature, with the top level representing the finished product which may be a sub-assembly or a completed item. An example of this is the NAAMS BOM that is used in the automotive industry to list all the components in an assembly line. Creating an effective bill of materials is part of sound supply chain management.

We’ve got 54 definitions for BOM »

Bills of materials facilitate efficiency and help companies manage their operations costs. This is a simple list with each assembly or subassembly needed for a product shown once, with the corresponding quantity required for each product. However, this type of BOM is unsuitable for complex products because it does not specify the relationship between parent and child parts and between assemblies and subassemblies.

For example, a computer is exploded into hard drives, computer chips, random access memory panels, and processors. Each processor is exploded into an arithmetic unit, a control unit, and a register. The requirements for the arithmetic unit, control unit, and register are imploded into the requirements for the processor, which are imploded into the requirements for the entire computer.

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Engineering BOMs are specific to engineering used in the design process; manufacturing BOMs are specific to the manufacturing used in the assembly process. BOMs are also useful for companies that run lean production and continuous improvement-based processes. The upfront blueprint that a BOM provides helps avoid wasteful production errors. For each product, the time-phased product structure shows the sequence and duration of each operation.

Configurable BOM

A bill of materials shows the relationship between the finished product and its components. It’s useful for estimating the cost of materials, planning purchases, ensuring availability of parts, and avoiding delays in production. A BOM list is necessary when building a product and ordering replacement parts, and reduces possible issues if product repairs are required. It helps to plan for acquisition orders and reduces the possibility of errors. The different types of bills of materials (BOMs) depend on the type of project and the business needs.

Among the most common methods of representing a BOM are single-level BOMs and multilevel ones. Master your role, transform your business and tap into an unsurpassed peer network through our world-leading virtual and in-person conferences.

More meanings of BOM

BOMs help ensure third-party contract manufacturers are using efficient and accurate when production methods. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. Items included in a BOM are the part number, part name, quantity, unit of measurement, assembly references, method of parts construction, and additional notes. You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

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