Understanding Types of Fasteners in CNC Machining--cncmass.com(low alloy steel Helen)

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In the realm of manufacturing and engineering, CNC machining plays a pivotal role. It is the process of using computer-controlled machinery to produce precise parts and components for numerous industries. One crucial aspect of this process is the selection and utilization of fasteners. From nuts and bolts to screws and rivets, fasteners are the unsung heroes that hold everything together. In this article, we delve into the different types of fasteners used in CNC machining and their significance.

1. Bolts and Screws:
Among the most common fasteners used in CNC machining are bolts and screws. Bolts generally have external threading while screws feature internal threading. Bolts utilize a nut to secure them, whereas screws are self-tapping and can be directly driven into pre-drilled holes. These fasteners come in a wide range of shapes and materials, such as stainless steel or titanium, offering strength, durability, and resistance to corrosion.

2. Nuts:
Nuts are designed to mate with threaded bolts or screws. They provide a means of securing two or more objects together by creating tension through compression. Just like bolts, nuts come in various sizes, configurations, and materials to suit specific applications. Hexagonal-shaped nuts are particularly popular for CNC machining due to their ease of use and versatility.

3. Rivets:
Rivets offer a permanent joining solution. Unlike other fasteners that rely on threads or mating surfaces, rivets are inserted into drilled holes and then secured by deforming or 'clinching' the unexpanded end. The deformation creates a larger surface area, ensuring a strong bond. Rivets find extensive usage in sheet metal fabrication, aeroplane construction, and automotive assembly.

4. Washers:
Often overlooked but essential fasteners in CNC machining are washers. They act as protective devices, distributing the load over a wider area and reducing stress on the fastened materials. By preventing the fastener from digging into or damaging the surface beneath it, washers enhance stability and prevent loosening over time. Flat washers and spring washers are the two primary types used in CNC machining, each serving specific purposes.

5. Threaded Inserts:
Threaded inserts provide an effective way to create durable threads in materials that may not possess them naturally. These inserts are often made of metals such as brass or stainless steel and are inserted into pre-drilled holes using specialized tools or heat application methods. Once fitted, they offer a reliable threaded surface for bolts or screws to secure into, reinforcing strength while minimizing wear and tear.

6. Anchors:
Used extensively in construction applications, anchors are fasteners specifically designed to hold objects firmly to surfaces, particularly when there is no access to the backside. They come in various forms, including expansion anchors, toggle bolts, and wedge anchors. In CNC machining, anchors play a crucial role in ensuring stability during milling, drilling, and cutting processes.


In the world of CNC machining, selecting the appropriate type of fasteners is paramount to ensure the structural integrity, precision, and longevity of the end product. From bolts and nuts to rivets and washers, each fastener serves a unique purpose in holding components together securely. Understanding their characteristics, sizes, and material options allows engineers and manufacturers to make informed decisions for successful CNC machining projects. So, the next time you admire a complex assembly, remember that behind its flawless functionality lies the power of well-chosen and expertly applied fasteners. CNC Milling