Understanding Different Types of Fasteners in CNC Machining--cncmass.com(press fit tolerancing Marvin)

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In the world of manufacturing and engineering, fasteners play a vital role in holding various components together. Whether it is an automotive industry or aerospace, construction or electronics, fasteners are indispensable for securing parts in place. In this article, we will delve into the different types of fasteners used in CNC machining, providing essential insights into their characteristics, applications, and production techniques.

1. Screws:
Screws are one of the most commonly used types of fasteners in CNC machining. They consist of a threaded body with helical grooves that hold materials firmly when twisted into them. These versatile fasteners come in a wide range of sizes, designs, and materials, allowing for countless applications. Producing screws involves precision machining processes such as turning, milling, threading, and heat treatment to achieve desired strength and durability.

2. Bolts:
Similar to screws, bolts feature a threaded cylindrical shaft but differ in design and application. Unlike screws, bolts usually require nuts to secure two or more parts together, which allows for disassembling if needed. Bolts are widely used in heavy-duty applications, including structural constructions and machinery assembly. Like screws, bolt production involves machining operations combined with heat treatment for enhanced mechanical properties.

3. Nuts:
While not technically considered a fastener on its own, nuts complement screws and bolts by creating a secure connection. Nuts are internally threaded and tightened onto screws or bolts to secure objects together. A variety of nut designs exist, including hexagonal, square, wing, and nylon lock nuts, each catering to specific requirements. Nut production often involves hot forging followed by turning, drilling, milling, and thread forming processes.

4. Rivets:
Rivets serve as permanent fasteners and are widely employed to join metal sheets or structures where welding is impractical or undesirable. These primarily cylindrical-shaped fasteners have a mandrel, which deforms the rivet body when installed, resulting in a secure connection. Rivets are commonly found in industries like aerospace and automotive manufacturing. Production techniques for rivets involve cold heading or hot forging processes followed by machining to achieve specific dimensions.

5. Clips:
Clips, also known as clamps or spring clips, are widely used for holding objects together without the need for screws or bolts. These fasteners utilize spring tension to provide a reliable connection between components. Clips find applications in various sectors, including automotive upholstery, panel assembly, and consumer electronics. The production of clips involves stamping or wire forming processes, followed by heat treatment for achieving desired strength and elasticity.

6. Dowel pins:
Dowel pins are cylindrical-shaped fasteners used to align and join parts accurately. Widely employed in CNC machining applications where precise positioning is crucial, dowel pins ensure accurate assembly and ease of disassembly if required. The production of dowel pins includes precision grinding and heat treatment processes, obtaining dimensional accuracy and wear resistance.


Fasteners play an essential role in CNC machining, ensuring structural integrity and functionality across diverse industries. By understanding the different types of fasteners and their production techniques, manufacturers can make informed choices based on specific application requirements. Whether it's screws, bolts, nuts, rivets, clips, or dowel pins, each type offers distinct benefits and characteristics tailored to a wide range of engineering needs. As technology advances, CNC machining continues to evolve, allowing for more efficient and precise production methods, thereby contributing to the ever-increasing demand for high-quality fasteners. CNC Milling CNC Machining