A Guide to Different Types of Fasteners in CNC Machining--cncmass.com(surface finish 125 Evan)

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Fasteners play a crucial role in various industries, including CNC machining. These small but essential components are designed to hold parts together securely and ensure the proper functioning of machinery and structures. In this article, we will explore the different types of fasteners used in CNC machining and discuss their characteristics, applications, and manufacturing processes.

1. Screws:
Screws are probably the most common type of fasteners used in CNC machining. They consist of a threaded shaft with a head at one end, allowing them to be easily inserted and tightened with a screwdriver or wrench. There is a wide variety of screws available, including machine screws, self-tapping screws, socket head cap screws, and shoulder screws. Each type has unique properties that make it suitable for specific applications. For instance, machine screws are commonly used to fasten metal parts, while self-tapping screws are ideal for creating threads in softer materials like plastic or wood.

2. Bolts:
Bolts are similar to screws but have external threading and require nuts to secure two or more parts together. Like screws, bolts come in various sizes, lengths, and head shapes, such as hexagonal, square, or round heads. They are often used in applications where higher strength and load-bearing capability are required. Bolted connections provide excellent resistance against shear forces, making them suitable for heavy-duty machinery and structural components.

3. Nuts:
Nuts are female fasteners designed to mate with bolts or screws. They typically have an internal thread that allows them to be twisted onto the corresponding bolt or screw shaft, creating a secure joint. Hex nuts, wing nuts, and locknuts are just a few examples of nut types used in CNC machining. Wing nuts, known for their easy hand tightening, are commonly used in low torque applications, whereas locknuts incorporate additional features to prevent loosening due to vibration or external forces.

4. Washers:
Washers are thin plates, often circular in shape, placed between the fastener head/nut and the material surface. They serve multiple purposes, such as distributing the load over a larger area, preventing damage to the working surface, reducing friction, and acting as a locking mechanism. Flat washers and lock washers are commonly used in CNC machining applications. While flat washers distribute loads and protect surfaces, lock washers provide resistance against loosening caused by vibration.

5. Rivets:
Rivets are permanent mechanical fasteners that consist of a smooth cylindrical shaft and a formed head at one end. They are used to join two or more materials together by deforming the rivet's tail through heating or applying pressure. Riveted joints offer excellent strength and reliability under various loading conditions. Another advantage is their ability to be quickly installed without the need for specific tools—ideal for production lines dealing with high volumes of repetitive work.


Different types of fasteners are essential components in CNC machining, ensuring the stability and functionality of assemblies. Screws, bolts, nuts, washers, and rivets each have unique properties, making them suitable for various applications. Understanding these differences enables manufacturers to choose the right fasteners for their specific needs, considering factors such as material compatibility, load-bearing capability, and environmental conditions. By employing high-quality fasteners and proper installation techniques, CNC machinists can optimize the performance and longevity of their products. CNC Milling CNC Machining