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What Is a Bill of Materials?

bill of materials

A bill of materials, also known as a product structure, is a detailed list of raw materials, intermediate assemblies, parts, and sub-components used to produce a product. It is a useful tool for communication between manufacturers of a product and between partners involved in the production process. It may also be used to communicate with other manufacturing companies within a single manufacturing facility.


A Bill of Materials (BOM) is a list of components used to build a product. It should be organized by part number, not by quantity. There are two basic types of BOMs: single-level and multi-level. Single-level BOMs are usually used for products that are relatively simple. They list only the parts needed for a specific product, and do not show the relationships between those parts. A multi-level BOM is better for more complex products, as it allows for multiple levels of sub-assemblies.

A BOM is a vital document in the manufacturing process. It enables product development by guiding production. It’s also important for companies with supply chain partners to ensure revision control. By doing so, companies can avoid delays and unnecessary production mistakes. When using a BOM, it’s important to make sure that it is updated regularly.

Bills of materials are very helpful for product manufacturers, as they streamline the production process by allowing them to update their data in real-time. ABOMs are often multi-level, as they track the construction process. They are essential for a company to ensure the quality of their products and make sure that they are built to meet customer requirements.

The BOM record can go through several iterations during the design phase. It’s vital to maintain an accurate history of revisions and make sure that the BOM is easy to view. It should also allow for easy navigation and review of components and subassemblies. In addition to this, the bill of materials can be linked to an engineering change order to streamline the review process.

An aBOM management solution can help improve productivity and eliminate errors in production. It can also improve the effectiveness of service technicians. By making information on components and materials easily accessible, aBOM management solutions can streamline the entire process, giving engineers the control they need to deliver quality products.


A bill of materials (BOM) is a list of the materials and components used to manufacture a product. It lays out the manufacturing process and minimizes mistakes. For example, a digital fabrication company like Form Labs might use a BOM for their products. The idea of using a BOM started during World War I to make the most efficient use of scarce materials. By the end of the war, companies had a better grasp of how to fill orders.

A bill of materials should be comprehensive and easy to read. It should contain information about the materials, cost, and quantity of each part or assembly. The information should also include the name and part number of the product. The BOM should also contain a unit of measurement for each item. Regardless of the scale of the company, an accurate bill of materials will improve decision-making and facilitate efficient production processes. It will also help you cut waste and improve supply chain resiliency. A BOM that is not up-to-date or poorly created could result in inaccurate cost estimates, incorrect product costs, and inventory overages.

A TBOM bill of materials should be comprehensive and clear. It lists all materials used to manufacture a product. It should also show the components and subcomponents of each part. For example, a table is composed of four legs, a table top, and nuts and bolts. If the table is a simple product, a single-level BOM may be sufficient.

A BOM is a vital document in manufacturing and assembly planning. It is similar to a shopping list for a new product. It allows manufacturers to manage the costs of global sourcing, production processes, and tooling. The bill of materials can also be used in Enterprise Resource Planning (ERP) and Manufacturing Execution Systems (MES).


In an EBOM bill of materials, the parts used to build a product are listed by level and by name. The level explains the placement of the part in the BOM hierarchy, and the name helps identify the part. Parts must have accurate descriptions, so that they can be identified and compared when necessary.

Creating a BOM is complicated, especially for products that have hundreds of components. Even one minor change in a component can affect the entire BOM. It can even be a headache to measure the various parts, including the consumables. But knowing how to accurately quantify these materials will ensure that your bill of materials is complete and accurate.

An EBOM is also useful for planning. It can be used to source vendors for new parts. It can also include drawings of new parts. It can become the standard for a manufacturing bill of materials. In addition, it is useful for product development. However, it should be understood that an EBOM should be used only for parts that are critical to a product.

An EBOM bill of materials can help reduce the time gap between the engineering phase and production. It is essential to provide a clear and accurate bill of materials to ensure a smooth handoff from engineering to manufacturing. Having an EBOM that includes all the required components and parts can help the manufacturing team make smarter decisions.

An EBOM bill of materials can be in two different forms: the single level bill of materials, and a multi-level bill of materials, also known as an indented product structure. Examples of each are shown on Page 31.

Sales bill of materials

A Sales bill of materials (BOM) is a document used to document sales transactions. It lists the components that go into a product. Each component has a price and quantity. It also lists how many of each item is required to create a finished product. Unlike an assembly bill of materials, which contains individual items and no instructions, a template BOM has more flexibility and can be used for many different purposes.

A bill of materials is an important document to create. It helps in better planning, including mapping out what parts are needed to manufacture a product. It also helps in ordering materials in an efficient manner. It can also be helpful for costing and time management. It can simplify complex manufacturing processes. Moreover, it helps in keeping all departments on the same page.

The accuracy of a BOM is essential for any manufacturing process. Without an accurate bill of materials, a company can end up with incorrect product costs, incorrect inventory levels, or incorrect accounting. An authentic BOM improves purchasing decisions, provides integrated manufacturing information, and reduces the need for revisions. As a result, a sales bill of materials can be a powerful tool to improve buying decisions and improve your bottom line.

A Sales bill of materials can be either a single level or multi-level document. The former focuses on the finished product while the latter includes all the components that go into its assembly. The latter document is used when a product has multiple levels, such as a jewelry set.

Engineering bill of materials

An Engineering bill of materials (EBM) is a document used to describe the components of a product. A properly-constructed EBM can prevent costly mistakes that affect the cost and quality of a product. Using the right level of detail helps avoid unnecessary revision cycles and helps engineers plan better for manufacturing. EBMs are often managed through product lifecycle management software.

An EBM defines the components used in a product and includes a technical drawing that depicts the product’s functional characteristics. This document is often created by engineers using CAD and EDA software. It includes both purchased parts and customized ones. It also reflects the cost of a product. In addition, the EBM helps engineers determine which parts they’ll need for future production. If an EBM is created for a product that will be sold, it includes alternate part numbers and the components listed in drawing notes.

An Engineering bill of materials can be a spreadsheet, pdf, or even a cloud-based solution. Regardless of its format, it should contain the correct information about all of the materials used to create the product. OpenBOM is a great option for managing the BOM because it unifies vital information and streamlines production.

An Engineering bill of materials is a useful tool for planners, procurement, and finance departments. It can be used for new product development and for sourcing vendors. A comprehensive bill of materials can even become a standard for manufacturing bills of materials, and can help a company launch a new product. If a new product is going to be introduced into a product line, an engineering BOM can help the manufacturer ramp up the tools and test the new part before ramping production.

A Bill of Materials can contain many different things, including a reference designator, component name, and description. Sometimes a Bill of Materials will even include a numbering system, which allows designers to better organize the information in a way that is easier to understand.