A Comprehensive Guide to Types of Fasteners Used in CNC Machining--cncmass.com(what is anodizing Cynthia)

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CNC (Computer Numerical Control) machining has revolutionized the manufacturing industry, ensuring precision and efficiency in various sectors. One crucial aspect of CNC machining is fastening components securely together. In this article, we will explore the different types of fasteners used in CNC machining processes.

1. Nuts and Bolts:
Nuts and bolts are perhaps the most common type of fasteners used across industries. CNC machined nuts and bolts typically consist of a threaded screw (bolt) and a matching internally-threaded cylindrical-shaped metal piece (nut). They provide excellent shear strength and can withstand high loads, making them ideal for applications where stability and durability are essential.

2. Machine Screws:
Machine screws are similar to nuts and bolts but differ in their head styles, which can range from flat, oval, round to hexagonal shapes. These screws are primarily used with tapped holes or existing threads within a component's surface. Machine screws ensure a flush fit and do not protrude above the surface, providing a neat finish. These versatile fasteners find application in assembling machine parts, electrical equipment, and other industrial applications.

3. Hex Head Cap Screws:
Hex head cap screws, also known as hex bolts, feature six-sided heads and external threading. They are designed to be tightened using wrenches or ratchets, offering superior grip and torque. Due to their structural integrity and resistance to loosening caused by vibrations, these fasteners are commonly employed in heavy-duty machinery, automotive assembly lines, and construction projects.

4. Set Screws:
Set screws are small threaded fasteners without a traditional head. Instead, they usually have either a cup, cone, or flat end that allows them to penetrate into objects to secure two surfaces together. The absence of any protruding component offers an aesthetically pleasing appearance and prevents interference while minimizing the risk of accidental tampering. Set screws are used in a wide range of applications, including assembling gears, pulleys, and shaft components.

5. Self-Tapping Screws:
Self-tapping screws negate the need for pre-drilled holes as they can create their threads while being driven into the material. These fasteners have sharp points and distinct thread patterns designed to cut through metal or plastic surfaces easily. They find extensive use in CNC machining processes involving softer materials such as aluminum, PVC, or sheet metal.

6. Rivets:
Rivets are permanent mechanical fasteners commonly used when welding or screwing is not feasible due to access limitations or surface conditions. They consist of a cylindrical shaft (shank) with a head at one end that expands upon installation, securing two or more parts together. As rivets do not require torque for installation, they are widely preferred in industries like aerospace, automotive, and shipbuilding.


In conclusion, understanding the different types of fasteners used in CNC machining is crucial for ensuring sturdy and durable assemblies. Nuts and bolts, machine screws, hex head cap screws, set screws, self-tapping screws, and rivets each serve unique purposes based on the application requirements. By selecting the appropriate fastener type, manufacturers can optimize the structural integrity, functionality, and aesthetic appeal of their CNC machined components. CNC Milling