A Comprehensive Guide to Types of Fasteners in CNC Machining--cncmass.com(from prototype to production Phyllis)

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Fasteners play a crucial role in CNC machining, holding components together securely and ensuring the structural integrity of various products. Whether it's assembling machinery or constructing buildings, choosing the right fasteners is essential for a successful project. In this article, we will explore different types of fasteners used in CNC machining and dive into their functionalities.

1. Screws:
Screws are perhaps the most common type of fastener utilized in CNC machining. They come in various shapes, sizes, and materials. The choice of screw depends on factors like load capacity, corrosion resistance, and environmental conditions. Common types include machine screws, wood screws, sheet metal screws, self-tapping screws, and shoulder screws.

2. Bolts & Nuts:
Bolts and nuts form an integral part of fastening systems in CNC machining. They provide strong connections while allowing for disassembly and reassembling when needed. Depending on specific requirements, bolts may differ in head style (hex, carriage, square), shank shape, threading, and material composition. Similarly, nuts can be standard hex nuts, lock nuts, flange nuts, wing nuts, or cap nuts.

3. Rivets:
Rivets offer permanent joining solutions where welded or screwed connections may not be suitable. They consist of a pin-like structure with heads at both ends, which secure components by deforming once installed. CNC machines effectively punch holes required for rivet installation, enabling reliable bonds in aerospace, automotive, and construction industries.

4. Washers:
Washers are thin flat discs made from metal or plastic that sit between fasteners and the surface being connected. They distribute the pressure evenly across the assembly, preventing damage or distortion. Common washer types include flat washers, spring washers, locking washers, and fender washers, each catering to different needs.

5. Anchors:
Anchors are essential for attaching objects to solid surfaces such as concrete or masonry. In CNC machining, anchors provide stability and strength in applications like wall mounting fixtures, handrails, or machinery bases. Examples of anchors include wedge anchors, sleeve anchors, drop-in anchors, and toggle bolts, all designed to withstand heavy loads.

6. Inserts:
Threaded inserts act as strengthening elements when fastening materials with low load-bearing capacities (like plastics). These inserts reinforce the connection point, allowing screws to be screwed into them rather than directly into the material. They can be heat-set, press-fit, or self-tapping depending on the application and material chosen.

7. Retaining Rings:
Retaining rings, also known as snap rings, effectively hold components in place within a bore or groove. They ensure axial positioning, resist rotational motion, and absorb vibrations. Common types include internal retaining rings, external retaining rings, E-style retaining rings, and spiral retaining rings.


Choosing the suitable type of fastener is crucial for successful CNC machining projects. By understanding the various fasteners available – including screws, bolts, nuts, rivets, washers, anchors, inserts, and retaining rings – manufacturers can ensure optimal performance, durability, and reliability. A thorough comprehension of these fastening options allows engineers and designers to navigate through specific requirements efficiently, resulting in well-constructed products that meet industry standards. CNC Milling CNC Machining