what is a fastener screw


A fastener screw, also known as a bolt, is a versatile and essential component in any construction or manufacturing project. They are used to hold two or more objects together securely or to attach objects to a surface. Fastener screws come in various types and sizes, and each has unique characteristics and usage.

In this article, we will discuss what a fastener screw is, its functions, types, and applications. We will also explore the factors to consider when selecting the best fastener screw for different projects.

What is a Fastener Screw?

A fastener screw is a threaded metal component with a head and a shank. The head is the part of the screw that is turned to tighten or loosen it, while the shank is the threaded portion that penetrates the material. The threads on the shank provide grip and enable the screw to hold the material together securely.

Functions of a Fastener Screw

Fastener screws have two primary functions: to hold materials together securely or to attach objects to a surface. They create a bond that is strong enough to withstand external forces like vibration, pressure, and tension. They can also be used to reinforce the materials being joined.

Types of Fastener Screws

There are different types of fastener screws, and each has its unique characteristics and uses. The most common types include:

1. Machine Screws

Machine screws are designed to fit pre-tapped holes and are usually smaller in size. They are commonly used in the manufacturing industry to hold parts and equipment together.

2. Wood Screws

Wood screws have coarser threads compared to machine screws and are designed for use with wood. They come in various lengths and gauges and are used for woodworking projects like making furniture, cabinets, and doors.

3. Sheet Metal Screws

Sheet metal screws have a sharp pointed end and are used for fixing sheet metal to another material. They have fine threads that enable them to penetrate and create a secure grip on the material.

4. Self-Drilling Screws

Self-drilling screws are designed for easy installation and are commonly used in construction and automotive industries. They can penetrate both metal and wood, eliminating the need for drilling a pilot hole.

5. Lag Screws

Lag screws are commonly used in heavy construction projects and are used to join structural timber. They have a larger shank compared to other screws, making them ideal for withstanding heavy loads.

Applications of Fastener Screws

Fastener screws are used in different industries and applications, including:

1. Furniture making and repair

Fastener screws are used in making and repairing furniture. They are used to join the different parts of furniture like the legs, frames, and other components.

2. Construction

Fastener screws are commonly used in construction projects for joining beams, trusses, and other structural components.

3. Automotive industry

Fastener screws are used in the automotive industry for joining different car components like the engine, transmission, and suspension.

4. Electronic and electrical equipment

Fastener screws are used in electronic and electrical equipment for joining different components like circuit boards and transformers.

5. Plumbing and HVAC

Fastener screws are used in plumbing and HVAC systems to join pipes, fixtures, and other components.

Factors to Consider When Choosing a Fastener Screw

When selecting a fastener screw, there are various factors to consider to ensure you choose the right type and size for your project. These include:

1. Material

The type of material you are joining will determine the type of fastener screw you need. For instance, wood screws are used for wood, while sheet metal screws are used for sheet metal.

2. Length

The length of the screw is essential, and you must select the right length to ensure a secure grip. The length of the screw should be enough to penetrate the material being joined and create an adequate grip.

3. Thread type

The type of screw thread is important, and you should select the right thread type for the job. For instance, fine threads are suitable for joining thin and delicate materials, while coarse threads are ideal for heavy-duty applications.

4. Head type

The head of the screw should be suitable for the application. Some examples of head types include flat, pan, round, and hex heads.

5. Coating

The coating on the screw determines its resistance to corrosion and weathering. You should select a coating that is suitable for the application and provides long-term protection.


Fastener screws are an essential component in various industries and applications. They come in different types and sizes, and each has unique characteristics and uses. When selecting a fastener screw, you should consider factors like material, length, thread type, head type, and coating to ensure you choose the right screw for your project.


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