Exploring Various Types of Fasteners and Their Role in CNC Machining--cncmass.com(riveting work Ellis)

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Fasteners play a crucial role in various industries, including CNC machining. These small components are responsible for holding different parts together, ensuring the structural integrity and durability of machines, equipment, and devices. In this article, we will delve into the world of fasteners, exploring their types, functions, and manufacturing process.

Understanding Fasteners:

Fasteners come in diverse shapes and sizes, each serving a unique purpose. They can be broadly categorized into two main groups: permanent fasteners and non-permanent fasteners. Permanent fasteners include welding and adhesives, while non-permanent fasteners encompass screws, bolts, nuts, rivets, and more.

Types of Fasteners:

1. Screws:
Screws are one of the most commonly used fasteners in CNC machining. They consist of a threaded shaft with a slotted or Phillips head, allowing easy installation using a screwdriver or power tool. Threads on the shaft provide grip and prevent loosening over time. Screws are further classified based on factors like thread pitch, head shape, and drive type, offering versatility in numerous applications.

2. Bolts:
Bolts are similar to screws but usually lack a built-in driving feature. Instead, they require a separate nut for secure attachment. Bolts comprise a solid cylindrical shaft featuring external threading. Depending on their specific function, different bolt heads, such as hexagonal, square, or round, may be used.

3. Nuts:
Nuts are internally threaded fasteners that complement bolts, providing a secure lock when tightened. They come in various shapes, including hexagon, square, and winged styles, with corresponding threads for compatibility. Nuts often incorporate washers to distribute pressure evenly and reduce surface damage.

4. Rivets:
Unlike screws and bolts, which create a temporary connection, rivets serve as permanent fasteners. They are cylindrical in shape, featuring a head on one end and a pre-formed tail on the other. Rivets provide exceptional strength when deformed by applying force, securing two or more parts together effectively.

5. Washers:
Washers act as protective components between the fastener and the surface it contacts. They help distribute loads evenly, prevent damage, and reduce the risk of fastener loosening over time. Common types of washers include flat washers, spring washers, and lock washers.

Production Process of Fasteners:

Fasteners undergo various manufacturing processes to ensure high-quality standards. While the exact production process may vary based on the type of fastener, some common steps include:

1. Material Selection: High-strength materials such as stainless steel, carbon steel, and aluminum alloys are commonly used due to their durability, corrosion resistance, and mechanical properties.

2. Cold Heading or Hot Forging: In this step, metal wires or bar stocks are formed into the desired shapes using either cold heading or hot forging techniques. Cold heading involves reshaping the material at room temperature using high pressure, while hot forging relies on elevated temperatures for shaping.

3. Threading: Screws and bolts require threading, which can be achieved through several methods like rolling, cutting, or grinding. Threads are cut onto the shafts, ensuring compatibility with corresponding nuts or tapped holes.

4. Heat Treatment: To enhance the physical properties and increase hardness or tensile strength, heat treatment processes like annealing, quenching, or tempering may be employed.

5. Surface Coating: Many fasteners undergo additional surface coating treatments such as plating, galvanizing, or coating with anti-corrosive agents to improve their longevity and resistance against environmental factors.


Fasteners play an integral role in CNC machining, holding different parts together securely. By understanding the variety of fasteners available, including screws, bolts, nuts, rivets, and washers, manufacturers can ensure the reliability and durability of their products. The precise production processes involved in creating these essential components are equally crucial to guaranteeing superior performance in a wide range of applications. CNC Milling CNC Machining