Essential Guide to Types of Fasteners in CNC is stronger brass or bronze Nicole)

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CNC machining has revolutionized the manufacturing industry with its precision and efficiency. From automotive parts to electronic components, CNC machines aid in producing high-quality products quickly and accurately. One crucial aspect of CNC machining is the use of fasteners. Fasteners play a vital role in holding components together, ensuring structural integrity, and facilitating ease of assembly and disassembly. In this article, we will delve into the various types of fasteners commonly used in CNC machining processes.

1. Screws:
Screws are one of the most widely used fasteners in CNC machining. They come in various types, such as machine screws, self-tapping screws, and set screws. Machine screws are typically used to join metal parts, while self-tapping screws create their own threaded holes in softer materials like plastic or wood. Set screws, on the other hand, are designed to secure rotating parts on a shaft or spindle.

2. Bolts:
Bolts are similar to screws but differ primarily in their application and design. They have a larger diameter and are often used with nuts for added stability. Bolts are commonly employed in CNC machining to join heavy-duty components that require extra strength and load-bearing capacity.

3. Nuts:
Nuts are essential counterparts to bolts, providing the necessary thread engagement and gripping force. Hex nuts, also known as hexagon nuts, are prevalent due to their six-sided shape, which offers ease of tightening and loosening with standard wrenches. For specialized applications, you may also encounter square nuts, wing nuts, and flange nuts in CNC machining projects.

4. Washers:
Washers are flat discs with a central hole used to distribute loads evenly and protect surfaces from damage caused by friction or corrosion. Flat washers, lock washers, and spring washers are common variations found in CNC machining projects. Flat washers provide a smooth surface for tightening nuts or bolts, while lock and spring washers ensure that fasteners remain secure under vibration or thermal expansion.

5. Rivets:
Unlike screws and bolts, rivets are permanent fasteners used to join two or more materials together. They consist of a cylindrical shaft with a flattened head on one end, which is deformed or "riveted" after insertion into the pre-drilled holes. CNC machining often employs solid and blind rivets for fabricating complex structures where welding or adhesives may not be feasible.

6. Threaded Inserts:
Threaded inserts are commonly used in CNC machined parts, allowing for repeated assembly and disassembly without damaging the component's threads. These inserts provide stronger and more durable internal threads compared to directly tapping holes into softer materials like plastic or wood. Helical, key-locking, and heat-set threaded inserts are some of the popular options available in CNC machining.

7. Pins:
Pins serve as simple yet effective fastening components in CNC machining applications. Dowel pins align precisely located parts, preventing any relative movement. Split pins, also known as cotter pins, secure rotating elements like wheels or gears onto axles by passing through drilled holes and being bent at the ends to prevent accidental disengagement.

8. Clips and Clamps:
Clips and clamps help hold components securely in place during CNC machining processes, ensuring precise and accurate manufacturing outcomes. Spring clips, hose clamps, cable clamps, and snap rings are examples of these invaluable fasteners frequently employed in various industries.


Fasteners form an integral part of successful CNC machining projects by providing the necessary strength, reliability, and ease of assembly. Understanding the different types of fasteners and their appropriate applications is crucial for efficient manufacturing. From screws, bolts, nuts, and washers to rivets, inserts, pins, and clips, each fastener serves a specific purpose in CNC machining, contributing to the overall quality and functionality of the end product. Whether you are an engineer, designer, or hobbyist working with CNC machines, having a comprehensive knowledge of fasteners is essential for successful project execution. CNC Milling