Understanding the Various Types of Fasteners in CNC Machining--cncmass.com(aerospace cnc machine Marlon)

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CNC (Computer Numerical Control) machining has revolutionized the manufacturing industry, offering precise and efficient production processes. Among the various elements involved in CNC machining, fasteners play a crucial role in ensuring the stability and accuracy of the final product. In this article, we will delve into the world of fasteners used in CNC machining and explore their types, applications, and production techniques.

Types of Fasteners Used in CNC Machining:

1. Screws:
Screws are among the most common types of fasteners used in CNC machining. They come in numerous variations, such as flathead screws, pan head screws, socket head cap screws, and more. These versatile fasteners are crucial for joining two or more components together securely.

2. Bolts:
Similar to screws, bolts are threaded fasteners that rely on nuts for proper attachment. They can withstand higher loads compared to screws due to their structural strength. Bolts find extensive use in CNC machining operations that require enhanced durability.

3. Nuts:
Nuts complement bolts by providing secure connections between components. They come in different shapes, including hexagonal, square, and winged designs, each serving specific purposes. By properly matching compatible bolts and nuts, CNC machinists ensure robust and reliable joints.

4. Rivets:
Rivets are permanent fasteners utilized when welding or using screws becomes impractical. Commonly made from aluminum, stainless steel, or copper, rivets consist of a solid cylindrical shaft with a head at one end. They effectively hold materials like metal sheets together, making them popular in industries where lightweight yet strong connections are required.

5. Washers:
Washers act as protective barriers between fasteners and the surface they are connected to. Not only do washers distribute the load evenly, but they also prevent damage caused by friction and corrosion. Common types of washers in CNC machining include flat washers, lock washers, and spring washers.

6. Pins:
Pins are cylindrical fasteners that play a critical role in aligning parts or preventing them from moving. Precision dowel pins, split pins, and tapered pins are commonly used in CNC machining for precise positioning and alignment during assembly processes.

7. Clips:
Clips, also referred to as retaining rings or circlips, provide a simple and secure solution for holding components together. They come in various styles, including internal, external, E-clips, and C-clips. Clips find applications in situations where frequent maintenance or disassembly is required.

Production Techniques for Fasteners:

Fasteners can be produced using several manufacturing techniques, depending on the type and material. Here are some common methods utilized in their production:

1. Machining: Most high-precision fasteners are machined using CNC lathes or mills. Complex threads, special shapes, and intricate patterns can easily be achieved through computer-controlled machining processes.

2. Cold Heading: Cold heading involves shaping metal bars into fastener blanks by placing them under extremely high pressure. This process eliminates waste materials, offering cost-effective production and increased strength in fasteners.

3. Casting: For large-scale or unique-shaped fasteners, casting provides an effective method. Molten metal is poured into molds and left to cool, resulting in solidified fasteners with minimal post-processing requirements.

4. Injection Molding: Primarily used for plastic fasteners, injection molding allows manufacturers to produce intricate designs in bulk quantities quickly. It offers flexibility in shape and size while maintaining consistency throughout production.


Fasteners serve as essential components in CNC machining, providing stability, security, and reliability. By understanding the different types and production techniques, industry professionals can make informed choices suitable for specific applications. Whether it's screws, bolts, nuts, rivets, or other fasteners, their correct selection and usage are vital for maintaining the integrity of CNC machined products. CNC Milling CNC Machining