What is Engineering Bill Of Materials (EBoM) | PLM Developer

Bill of materials (BOM)

A bill of materials is a list of parts needed to manufacture a particular product. This is often used in engineering, where the BOM is used to plan the production of a device. A BOM consists of two types of items - components and subcomponents. Components can be physical objects that form the finished product, while subcomponents are smaller components of the final product.


Engineering Bill Of Materials (EBOM)

Engineering bill of materials (EBoM)

An engineering bill of materials is a type of BOM used in manufacturing engineering. An EBoM lists the individual parts and their quantities needed to produce a specific amount of a manufactured item.

Manufacturing bill of materials (MBoM)

The manufacturing bill of material is a document that details the raw materials and equipment that went into making a single unit. It is usually created after the initial design phase and before any fabrication begins.

The engineering bill of materials (BOM) is used to determine the cost of manufacturing a product. This is done by determining what raw material costs, labor costs, overhead costs, etc., are needed to manufacture the product. The BOM is then multiplied by the number of units produced to arrive at the total manufacturing cost.

The manufacturing bill of materials (MBOM) is used to calculate the cost of purchasing a product. This is determined by calculating the price of the raw materials, shipping charges, taxes, etc., needed to buy the product. The MBOM is then multiplied by a factor called the unit production rate to arrive at the total cost of purchasing the product.


In this post, we discuss the role of the engineering bill of materials (eBOM) in PLM software. We first introduce the concept of eBOM and then describe its features. Then we show how eBOM can be used to model the manufacturing process. Finally, we explain how eBOM can help in the design phase.

Concept of Engineering Bill of Materials

The engineering bill of materials (EBOM) is a document that contains the list of parts needed to manufacture a product. EBOM is usually created manually by engineers and designers. However, it can also be generated automatically using computerized tools. 


A typical EBOM consists of two types of data: 


1) physical characteristics of the parts; 

2) their relationships. 


Physical characteristics of the parts include size, weight, material, etc. Their relationships have dimensions, tolerances, assembly sequence, etc.

Features of eBOM

The following are some of the features of eBOM:

  • It provides a complete picture of the product.
  • It helps in reducing inventory costs.

The manufacturing bill of materials (BOM) is a list of items needed at various stages of the production of a product. It helps to identify the raw material requirements and gives a better idea about the quantity consumed at any given location. This helps streamline operations in a company by reducing costs, improving quality, and increasing productivity.

A BOM can serve several purposes:

  • To track the material/component flow throughout the supply chain
  • To control the quantity used per unit of time
  • To plan future purchases
  • To estimate cost savings through purchasing efficiencies


An effective BOM should contain detailed information regarding the following:

  • Material type
  • Quantity
  • Unit price
  • Cost
  • Date purchased
  • Vendor information

In this session, we will discuss the importance of the manufacturing bill of materials and its impact on the end user. We will also look into the various components of an exemplary manufacturing bill of materials, along with the importance of keeping a proper Inventory management system.

Engineering BOMs

A Bill of materials (BOM) is a list of parts used to manufacture a product. A bill of materials is usually created at the beginning of a project to ensure that all necessary components are included in the final product. It is a critical step in the manufacturing process.

Engineering BOMs - Parts List

A parts list is a document that lists all the items needed to complete a particular task. For example, it may contain a description of the article, its function, size, weight, and any special instructions.

Engineering BOMs – Assembly Instructions

Assembly instruction is a detailed written procedure that describes how to assemble a product. It should include all steps involved in producing a product from raw material through testing.

Engineering BOMs — Manufacturing Processes

A manufacturing process is a series of operations performed on a product to create a finished good ready for distribution. This could include processes such as cutting, drilling, welding, painting, coating, polishing, etc.

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