BILL OF MATERIAL: Definition, Examples, Software, and Templates

Bill of Material
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The bill of materials is a list of everything that goes into making a finished product. So, the list includes not just raw materials but also subassemblies, subcomponents, subparts, and consumables. At the top of the BOM is the finished product. It’s also divided into sections that discuss the needs. This article will assist you in comprehending a bill of material software, and templates with examples.

Definition of Bill of Material

A bill of materials (BOM) is a structured, comprehensive list of the materials, components, and parts needed to manufacture or repair a product, the quantities required, and the materials’ names, descriptions, and costs. A BOM also includes instructions on how to obtain and use these materials. A BOM can serve as a central record of the materials, components, and processes used to build a product due to the breadth and depth of the data it captures. Examples of a bill of material can be a list of assembly components or a production recipe in process manufacturing industries. The bill of materials software breaks down how an item is made into its individual parts.

What Are the Types of Bills of Material?

The following are the three main types of BOMs:

#1. Manufacturing

A manufacturing bill of material (MBOM) is a detailed list of all the items and subassemblies needed to create a finished, shippable product. An MBOM also includes information about the parts that need to be processed before assembly and explains how various components in a product interact with one another. The manufacturing BOM information is shared with all integrated business systems involved in the ordering and building of the product, such as enterprise resource planning (ERP), material requirements planning (MRP), and, in some cases, a manufacturing execution system.

#2. Engineering

The engineering department also assembles parts that are defined in an engineering bill of material (EBOM). However, the engineering BOM is a mechanical or technical drawing of a product that shows the component structure from a functional standpoint. Engineers also create the design using computer-aided or electronic design automation tools. As a product’s design evolves, it is common to have multiple BOMs.

#3. Sales

In the sales stage, a sales bill of material (SBOM) defines the details of the product prior to assembly. The list of finished products and the components required to develop them appear separately in the sales order document in an SBOM. Instead of being managed as an inventory item, the finished product is managed as a sales item.

Key Elements of a Bill of Material (BOM)

The following elements are typically included in the bill of material: the BOM level; the part number, name, description, and quantity; the cost; and the unit of measure. The bill of material includes components and parts but excludes labor.

#1. Bill of Material Level

This is a one-of-a-kind number that indicates where each part or assembly falls in the BOM hierarchy. Consider a vehicle’s bill of materials. Each major component, such as the engine, doors, and drivetrain, would be represented by a level. They would be broken down even further into parts and materials, like the pistons and crankshaft of an engine. The pistons and crankshaft would be leveled and then disassembled into their component parts. Piston rings, for example, are components of pistons.

#2. Bill of Material Part Number

This unique number also identifies a material or part, making it easy for anyone involved in making it to find it. Part numbers can be intelligent in that they include information about the part. For example, “WIRE-001” could be an intelligent number for wire. Intelligent numbers can help identify each component. They do, however, require that the person making the numbering scheme knows about each part before putting numbers on them. However, there are no descriptions with non-intelligent part numbers. Moreover, they are easier to make and more likely to be right for longer periods of time. For the majority of organizations, either numbering system will suffice. The key is to maintain consistency.

#3. Bill of Material Part Name

The part name also serves as a unique identifier for each individual part or assembly. It, like the part number, aids users in quickly identifying the part.

#4. Bill of Material Phase

The phase also shows what stage each part is at in its lifecycle. “In production” or “in design” are two examples.

#5. Description

The description is also unique to each part or component and provides more detail than the part name or number. When it is necessary to distinguish between parts that appear similar, descriptions are useful. For example, “screws” may encompass both 1/2-inch and 5/8-inch machine screws.

#6. Quantity

The quantity shows how many parts are used in an assembly or subassembly. As an example, there are two piston rings per piston cylinder.

#7. Unit Measure

The unit of measurement in which a part will be purchased is also specified here. Specifying the unit of measurement ensures that the proper quantities are ordered. For complete parts, such as gaskets, the unit measure is most likely “each.”

It makes more sense to use a unit of measure for some parts or components. Wiring and lumber, for example, are commonly sold by foot. Small, low-cost, difficult-to-count parts, such as nails or screws, can be purchased by weight or by the box.

#8. Procurement Type

This describes how the element or component was obtained. However, people often have the choice of buying the part, making it themselves, or having subcontractors make it.

#9. Reference Designator

The reference designator is used when products contain printed circuit board assemblies. The reference designator identifies the location of each part of the circuit board assembly.

#10. BOM Notes

In the notes section, you can add extra information that anyone who looks at the BOM will find useful. It could be a list of substitute suppliers or the specifications that a material, such as adhesive, must meet.

What are the Examples Of a Bill Of Material

Examples of a bill of material can be a list of assembly components or a production recipe in process manufacturing industries. For example, if a bike company wants to make 1,000 bikes, the bill of material will include all the parts needed to make each bike. The most general examples of the bill of material can also be listed in tabular form, listing the type of product, name of inventory, and quantity.

Bill of Material Templates

In Microsoft Word, you can use a bill of the material templates to create a simple “spare parts” list. The chart includes space for part number and name, description, quantity, units, and unit and total cost, as well as approval signatures and dates, allowing you to move forward with production.

#1. Template for a Component List

This is a simple Excel spreadsheet containing a list of every component required to complete your product. List the item’s name and number, as well as its description, quantity, and units. The bill of material templates also includes space for notes about the stage of production as well as whether you will manufacture or purchase each component.

#2. Bill of Material Templates for a Single Level

This is a modular model with a single level. Include the part name and number, description, quantity, and units, as well as supplier information and a picture of each product. This is a good option if you are creating a relatively simple product with few component relationships.

‌#3. Bill of Material With Multiple Levels Templates

This modular template includes multiple levels of hierarchy to allow you to visually see the relationships between parts and components, but you can modify it to include as many levels as you need. There is also room to include information about the assembly phase, the production status of each component, and contact information for suppliers. If you need to create a bill of material for an engineering or manufacturing context, you can include information from either the design or manufacturing perspectives, as well as add or edit columns for additional information.

‌#4. Bill of Material Templates for a Supplier List

This template will also assist you in gathering contact information and staying organized if you are contracting with multiple vendors or suppliers for a project. List all contact information, the items supplied the order date, and any other comments to ensure that you receive all materials on time and to standard.

How to Calculate the Bill of Material?

Bills of materials (BOM) calculations use information from a number of different sources to figure out how much a manufactured item should cost on average. In the sources, there is information about items, how bills are sent, the calculations of the indirect costs, and the cost version. Examples of a bill of material can be a list of assembly components or a production recipe in process manufacturing industries.

What is BOM Structure?

BOMs are typically organized in one of two ways:

#1. A Single Bill of Material

Each part that will make up the product or asset is shown once in a single-level BOM, along with the quantity required. It’s similar to making a grocery list. Single-level BOMs are simple to create, but they do not show the relationships between the assemblies, subassemblies, and components used to build a product. When a product fails, determining which component needs to be replaced can be difficult. The single-level BOM will not differentiate between the parts used in the handle and those used in other vehicle parts.

#2. Multi-Level Bill of Material

A multi-level bill of material (BOM) depicts the relationship (sometimes referred to as parent-child) between components, sub-assemblies, and assemblies, as opposed to a single-level BOM. Indenting the materials and/or subassemblies that comprise the higher-level part or assembly is a common method for accomplishing this. Most complex products use multi-level BOMs because they show these relationships.

What Should Include in a Bill of Material?

This includes all part numbers and components listed as alternatives in the drawing notes. Code, name, number, revision, description, quantity, measuring unit, size, length, weight, and features are all included on each line of the bill of material (BOM). Examples of a bill of material can be a list of assembly components or a production recipe in process manufacturing industries.

What Is a Bill of Material Management?

BOM management is the process of capturing, configuring, and managing all of the product data that is created during the lifecycle of a product. Effective BOM management is important for the success of any manufacturer, no matter how big the product is or how many parts it has.

Bill of Material (BOM) Software

Bill of material (BOM) software automates the process of making a list of all the parts that go into making a product. Users can make item profiles for each part that goes into a specific product. The bill of material software lists the raw material, parts, and subassemblies that are needed to make each product. A bill of a material device tells you exactly what you need for each manufacturing job, so you can finish more jobs in less time and save money on both labor and material.

Bill of material software breaks down how an item is made into its individual parts. The bill of material software gives detailed instructions on how to put together a product from its parts and assemblies. The bill of material software creates the requirements by pulling information from order entry systems, inventory control modules, and master production schedule modules.. A bill of the material allows you to coordinate a variety of tasks, from material provisioning to work specification, into a single instruction set by integrating different functional areas.

A clear explanation of how to complete each manufacturing job will allow you to reduce material waste and better coordinate machine usage and labor.

Key Takeaways

  • A bill of material (BOM) is a structured list of all the parts and the material needed to make a product, along with instructions on how to get and use them.
  • A BOM helps organizations plan purchases of materials, estimate costs, plan for and keep track of inventory, and reduce production delays and waste.
  • A BOM that is accurate and complete makes it easy to figure out why a product broke and quickly replace the broken parts, materials, and components.
  • BOMs come in many different shapes and sizes. They can have one level or more than one. Engineering, manufacturing, and sales BOMs are some of the most common types.

FAQs

How do I create a bill of materials in Excel?

In Excel, create a new workbook and then type the column headings for your bill of materials. The headings should include all aspects of a part that are relevant to the finished project.

What is simplest BOM?

Single-level BoM is typically used for products with simple structures and no subassemblies. This document usually only helps one level of children with components, assemblies, and raw materials.

What is a BOM template?

Consider the BOM template to be a list of ingredients for your final product. It contains all of the information about the raw materials or components required to make a particular product.

References

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