Essential Types of Fasteners in CNC vs 316 stainless steel Betty)

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In the world of manufacturing and engineering, precision and reliability are paramount. CNC machining plays a vital role in achieving these standards by utilizing various types of fasteners. These small yet essential components ensure that everything is securely held together during the fabrication process. In this article, we will explore some of the most commonly used types of fasteners in CNC machining and understand their importance in creating quality products.

1. Bolts:
Bolts are the go-to choice for joining two or more objects together tightly. They feature an external threading which matches the internal threads tapped into the object being bolted. The bolts provide stability and prevent any movement, assuring structural integrity. Various materials such as stainless steel, carbon steel, and alloy steel can be used depending on the desired strength requirements.

2. Nuts:
Nuts are often paired with bolts to create a reliable connection between two parts. They feature internally threaded holes, allowing them to be tightened onto the bolt's thread. Just like bolts, nuts come in different sizes and variations based on their application. They are crucial not only for assembly but also for disassembly when maintenance or repairs are required.

3. Screws:
Screws serve a similar purpose to bolts but have tapered shanks and can self-tap into mating threads within a material. Their design makes them ideal for use with thinner sheets or materials where drilling a hole may not be feasible. Common examples include wood screws and machine screws, each having distinct characteristics suitable for specific applications.

4. Rivets:
Rivets are permanent fasteners widely employed in CNC machined structures where welding is impractical or inefficient. Consisting of a cylindrical shaft and solid head, they hold multiple layers of material firmly together. By deforming the protruding end of the rivet, it creates a mechanical lock, ensuring sturdiness even under heavy loads. Rivets are commonly used in automotive, aerospace, and construction industries.

5. Washers:
Washers play a crucial role in CNC machining by distributing the load of a fastener over a larger area, preventing damage to surfaces and ensuring proper tightening. They add stability and reduce stress concentrations, which can lead to failure. Various types such as flat washers, lock washers, and spring washers cater to different situations, providing essential support for the fastening process.

6. Inserts:
Threaded inserts are employed when increased durability and reinforcement are required in materials with low strength properties. These cylindrical metal components feature internal threads and are inserted into drilled or molded holes. Inserts enhance holding power, resist stripping or wear-out of tapped holes, and allow repeated disassembly and re-assembly without compromising the thread integrity.

7. Anchors:
Anchors are specialized fasteners used to secure objects to concrete, masonry, or other solid structures. CNC machined anchors ensure firm support and prevent displacement due to vibrations or external forces. Different anchor designs include wedge anchors, sleeve anchors, and expansion anchors, providing versatility for various applications like mounting heavy machinery, fixtures, or structural elements.


In CNC machining, selecting the appropriate type of fastener is crucial to achieve precise, durable, and reliable end products. Bolts, nuts, screws, rivets, washers, inserts, and anchors all serve specific purposes, enabling engineers and manufacturers to create robust assemblies. Understanding the characteristics and application areas of these fasteners helps in making informed decisions during the entire machining process. By prioritizing quality fasteners, precision manufacturing becomes possible, leading to successful projects that meet the highest industry standards. CNC Milling