Understanding the Different Types of Fasteners in CNC Machining--cncmass.com(zinc vs aluminum Ives)

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When it comes to precision manufacturing processes like CNC machining, fasteners play a crucial role in ensuring proper assembly and functionality. These tiny components are known for their ability to securely join two or more parts together, providing strength, stability, and versatility to various applications. In this article, we will explore the different types of fasteners commonly used in CNC machining and gain insights into their production process.

1. Screws:

Screws are one of the most widely used fasteners across industries. They consist of a threaded shaft with a head designed for easy manipulation using screwdrivers or similar tools. The threads provide a strong grip when screwed into corresponding tapped holes or nuts. Screws come in several variations, including machine screws, self-tapping screws, wood screws, and sheet metal screws, among others. Each variant is specifically designed to meet the requirements of different materials and applications.

To produce screws, CNC machining starts with raw material selection, typically stainless steel or carbon steel. This material is then cut to length, and its diameter is reduced through the threading process. Various treatments such as heat treatment and plating may be performed to enhance the screw's durability and corrosion resistance.

2. Bolts:

Bolts are similar to screws but differ primarily in how they secure parts. Unlike screws that tap into pre-existing holes, bolts require accompanying nuts for installation. Often paired with washers for added stability, bolts offer excellent shear strength and are essential in load-bearing applications. Common bolt types include hex bolts, carriage bolts, and anchor bolts.

The production of bolts follows a similar process to screws. Raw materials are selected based on factors like tensile strength and desired performance. After cutting and shaping, the bolt threads are created using CNC machining techniques. Surface treatments such as galvanization or black oxide coating may also be employed to increase durability and prevent corrosion.

3. Nuts:

Nuts are internally threaded fasteners that work in conjunction with screws or bolts to secure multiple components together. They are available in various shapes and designs, including hex nuts, wing nuts, lock nuts, and T-nuts. Depending on the application, different types of nuts may be chosen for their specific advantages, such as vibration resistance or improved gripping ability.

The manufacturing process for producing nuts begins with selecting appropriate materials, usually stainless steel or brass. The raw material is then shaped into the desired nut shape using CNC equipment. To ensure accurate thread creation, specialized machining techniques like tapping or threading can be utilized. Surface finishes like zinc plating or nylocking may also be added to enhance the nut's performance characteristics.

4. Rivets:

Rivets provide a permanent fastening solution by creating a joint between two or more parts through compression. These versatile fasteners are commonly used in applications where welding or screwing is not practical or possible. Rivets come in many forms, such as solid rivets, blind rivets, tubular rivets, and semi-tubular rivets. Each type offers unique benefits depending on the material and the strength required.

Producing rivets typically involves starting with long cylindrical rods made from aluminum, steel, or other suitable materials. The rod is then cut into shorter lengths, called "blanks." Using CNC machinery, the blanks are shaped into proper rivet forms, including head formation and any necessary grooves or flanges. Finally, heat treating or anodizing processes can be applied to increase the rivet's durability and appearance.


Understanding the various types of fasteners used in CNC machining is essential for ensuring successful assembly and structural integrity. Screws, bolts, nuts, and rivets each play a crucial role in achieving reliable and robust connections across diverse industries. By acknowledging the specific requirements of different applications and utilizing precise CNC machining techniques, manufacturers can produce fasteners that meet the highest standards of quality and performance. CNC Milling