Understanding Different Types of Fasteners in CNC Machining--cncmass.com(cmm Amos)

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CNC machining is a precise and efficient manufacturing process that utilizes computer numerical control (CNC) technology to create intricate parts and components. A crucial aspect of this process involves the use of various fasteners, which play an essential role in holding different parts together securely. In this article, we will explore the different types of fasteners used in CNC machining and discuss their production methods.

1. Bolts:
Bolts are one of the most common types of fasteners used in CNC machining. These threaded cylindrical rods come with a head at one end and threads on the other. The head facilitates easy tightening and loosening using appropriate tools such as wrenches or screwdrivers. Bolts can be produced through a range of processes, including traditional forging and more modern techniques like CNC turning or milling. The choice depends on factors such as material type, design specifications, and quantity required.

2. Screws:
Screws are similar to bolts but differ primarily in their applications. While bolts are used for connecting two unthreaded components, screws are designed to tap into pre-drilled holes to secure two or more objects together. They have helical threads along the length of their shafts, allowing them to engage firmly into the attached material. To produce screws, CNC lathes or thread-rolling machines are commonly employed. This ensures consistent quality and precision across large-scale productions.

3. Nuts:
Nuts complement bolts and screws by providing a threaded hole for their insertion. These internally threaded fasteners typically have hexagonal shapes, also known as hex nuts, enabling convenient tightening with a wrench or socket. Nuts can be made using various manufacturing methods, such as casting, cold heading, or CNC machining. Cold heading, utilizing high-speed automated presses, efficiently produces large quantities of standardized nuts.

4. Washers:
Washers act as protective components that distribute the load and prevent damage between fasteners and surfaces. They come in different types, including flat washers, which have a plain disc-like shape, and spring washers, which provide tension for enhanced locking capabilities. CNC machining is often used to produce washers from materials such as stainless steel, brass, or plastic. This ensures precise dimensions and tight tolerances while maintaining material durability.

5. Rivets:
Rivets are permanent mechanical fasteners consisting of cylindrical shafts with heads on one end. They are inserted through pre-drilled holes and secured by deforming or "cold-forming" the other end into a head using tools like rivet guns. Commonly used in applications requiring high strength and structural integrity, rivets find extensive use in industries such as aerospace and automotive. Different production methods, like hot forging or modern CNC milling, can be employed based on the specific requirements of the project.

6. Clips:
Clips, also known as snap fasteners or retaining clips, possess inherent flexibility for ease of installation and removal. These spring-like fasteners securely attach components together without the need for additional tools. Clips find wide applications in areas such as automotive upholstery, electrical enclosures, or panel assemblies. Manufacturing techniques like stamping or wire forming can be utilized to produce clips efficiently.


Fasteners play an integral role in CNC machining by ensuring the secure assembly of various components and parts. Understanding the different types of fasteners available and their production methods can help manufacturers choose the most appropriate ones for their specific projects. Whether it's bolts, screws, nuts, washers, rivets, or clips, each type serves a unique purpose within the realm of CNC machining. By selecting the right fasteners and utilizing advanced manufacturing processes, precision, reliability, and safety can be achieved in every CNC machined product. CNC Milling