Essential Guide to Types of Fasteners in CNC Machining(most common aluminum alloy Marico)

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When it comes to precision engineering and manufacturing, CNC machining plays a pivotal role. Computer Numerical Control (CNC) machining utilizes advanced technology and automated processes to produce intricate parts and components with high accuracy. From aerospace and automotive industries to electronics and medical sectors, CNC machining has revolutionized the way products are made.

One crucial aspect of CNC machining is securing and fastening different parts together. This article explores the myriad types of fasteners used in CNC machining and highlights their significance in ensuring structural stability and functionality.

1. Bolts:
Bolts are one of the most common types of fasteners employed in CNC machining. These threaded metal rods come in various sizes, shapes, and materials like stainless steel, carbon steel, or alloy steel. They typically feature an external thread on one end and a head on the other end, which allows them to be tightened with a wrench or spanner. Bolts often require nuts for ample grip and attachment strength.

2. Screws:
Similar to bolts, screws have spiral threads that allow rotational motion to secure parts together. However, unlike bolts, screws don't require additional nuts as they possess self-threading properties. The variety of screws available – such as wood screws, machine screws, and set screws – cater to specific applications’ requirements, including inserting into pre-drilled holes or creating new threads within the target material via tapping.

3. Nuts:
Nuts complement bolts by providing the necessary holding power to securely connect two or more objects. Their internal threads mate perfectly with the external threading of a bolt, forming a reliable joint. To ensure efficient operation, it's essential to select the right nut size, shape, and type according to the corresponding bolt dimensions.

4. Washers:
Washers act as both protective elements and load distributors in CNC machining. They are placed between the fastener and the workpiece surface. Washers not only distribute loads evenly but also prevent damage to the material being fastened. Different washers, such as flat washers, lock washers, or spring washers, offer specific functionalities like anti-vibration properties or resisting loosening due to vibrations.

5. Rivets:
Rivets are permanent fasteners that utilize a mechanical process of deforming the materials they join together. Commonly used in applications where welding is impractical, rivets provide strong and reliable connections. Cold riveting, driven by manual force or assisted by hydraulic tools, secures two or more pieces permanently. CNC machining allows for precise drilling and installation of these fasteners.

6. Dowel Pins:
Dowel pins serve as locating elements in CNC machining, supporting accurate alignment when joining parts together. Manufactured with high precision, dowel pins ensure consistent positioning during assembly, contributing to overall product quality and durability. They come in various sizes, shapes, and materials, including hardened steel, aluminum, or titanium.

7. Clips and Clamps:
Clips and clamps are versatile types of fasteners used extensively in CNC machining to hold objects firmly in place. From retaining rings and circlips to hose clamps and wire forms, these components exert pressure on surfaces to secure components without the need for screws, bolts, or nuts. CNC machining facilitates the production of custom clips and clamps tailored to specific design requirements.


In CNC machining, selecting the right fasteners is crucial, ensuring structural integrity, functionality, and ease of assembly. Bolts, screws, nuts, washers, rivets, dowel pins, and various clips/clamps each have their distinct features and applications. The choice of fasteners depends on factors like material compatibility, load capacity, environmental conditions, and desired aesthetics. By understanding the wide range of options available, engineers and manufacturers can optimize their CNC machining processes, resulting in reliable and long-lasting products. CNC Milling CNC Machining