Understanding the Various Types of Fasteners Used in CNC Machining--cncmass.com(strength in metals Stanford)

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In the world of manufacturing and engineering, CNC machining plays a vital role in producing high-quality parts with precision and accuracy. Behind the scenes, fasteners play an equally important role in ensuring that these components are assembled securely and function properly. This article aims to delve into the different types of fasteners used in CNC machining, highlighting their characteristics and applications.

1. Screws:

Screws are one of the most common types of fasteners utilized in CNC machining. They consist of a threaded shaft with a head designed for easy gripping and turning. CNC machinists use screws to hold together various machine parts, panels, or components during the assembly process. The threads on screws can be coarse or fine, depending on the desired application. Additionally, screws come in various shapes, including flathead, round-head, and pan-head, each serving specific purposes.

2. Bolts:

Bolts are similar to screws but differ primarily in their usage. Unlike screws, bolts require a nut to secure two or more parts together. When assembling using a bolt, a hole is drilled through the materials being joined, allowing the bolt to pass through. Once the nut is tightened onto the bolt, the joint becomes firm and sturdy. Throughout the CNC machining process, bolts find extensive use in holding heavy machinery components, frames, or structural parts together.

3. Nuts:

Nuts, as mentioned earlier, are paired with bolts during assembly. These small yet essential hardware items thread onto bolts, providing securing power. Like screws, nuts also come in different types, such as hexagonal nuts, wing nuts, and lock nuts. Hexagonal nuts are particularly popular due to their ease of tightening using a wrench or socket set.

4. Washers:

Washers may appear insignificant, but they are crucial components for maintaining the integrity of fastened joints. They are flat, thin plates typically made of metal or plastic and serve multiple purposes. Washers act as spacers, distributing the load evenly over a wider surface area to prevent damage. Additionally, they provide protection against damage caused by friction between the nut or bolt head and the material being fastened.

5. Rivets:

Unlike screws, bolts, nuts, and washers, rivets are permanent fasteners that cannot be easily removed once installed. They consist of a cylindrical body with a head at one end and require special tools for installation. Riveting involves inserting the shaft into pre-drilled holes and deforming it using pressure, creating a tight joint between two or more materials. CNC machining often utilizes rivets in applications involving aircraft assembly, automotive manufacturing, or construction projects.

6. Clips and Clamps:

In some instances, CNC machinists use clips and clamps as temporary fastening solutions during the manufacturing process. These devices hold workpieces together securely while allowing quick adjustments or removal when necessary. Clips and clamps come in various shapes and sizes, catering to specific requirements.


CNC machining relies not only on cutting-edge technology but also on reliable and efficient fasteners. By understanding the different types mentioned above, manufacturers can make informed decisions about which fastener to use based on their application needs. Whether it is screws, bolts, nuts, washers, rivets, or even clips and clamps, each type of fastener serves a unique purpose in CNC machining, ensuring durability, reliability, and precision in every finished product. CNC Milling CNC Machining