An Overview of the Types of Fasteners in CNC to go from prototype to production Joseph)

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CNC machining plays a crucial role in manufacturing various products across industries. It involves using computer-controlled machines to precisely shape and create complex parts out of materials like metal, plastic, or wood. One critical aspect of this process is the use of fasteners, which are essential for joining different components together securely. In this article, we will explore the types of fasteners commonly used in CNC machining and their importance in ensuring product integrity and functionality.

1. Screws:
Screws are among the most widely used fasteners in CNC machining. They consist of a cylindrical shaft with a spiral groove (thread) on its surface. Screws can be further categorized based on the type of head, such as flathead, Phillips head, or hex head. Additionally, screws may have specific features like self-tapping threads, machine screws, or wood screws. Choosing the right screw type depends on factors like material compatibility, load requirements, and aesthetic considerations.

2. Bolts:
Bolts are similar to screws, but they differ in their applications and design characteristics. Unlike screws that typically engage into a threaded component, bolts require a nut and often involve passing through pre-drilled holes. Their primary purpose is to provide a secure clamp force between two or more parts. Bolts come in various sizes, lengths, tensile strengths, and designs, including hexagonal head bolts, carriage bolts, or anchor bolts. Selecting the appropriate bolt helps ensure structural stability and proper clamping forces during assembly.

3. Nuts:
Nuts work in conjunction with bolts by providing threaded receptacles, allowing them to join various components tightly. Common nut types include regular hex nuts, locknuts, wing nuts, and cap nuts. Each of these variants serves a specific purpose based on application requirements, environmental conditions, and ease of installation. Employing the correct nut type is crucial for optimizing the fastening process and maintaining long-term mechanical integrity.

4. Rivets:
Rivets are unthreaded fasteners used to permanently join materials like metal or plastic sheets together. They consist of a cylindrical shaft with a head on one end, much like a nail. The rivet's shank passes through pre-drilled holes in the parts to be joined and then deforms (typically by hammering) to form a secure bond. Common types of rivets include solid rivets, blind rivets, and tubular rivets. Riveting provides excellent structural strength, corrosion resistance, and vibration resistance.

5. Washers:
Washers serve as an essential component during fastening processes. They are small, flat-shaped discs with a hole in the center. By placing washers between the fastener and the material being secured, they distribute loads evenly, prevent damage to the surface, and reduce the risk of loosening due to vibrations. Different washer types include plain washers, spring washers, and lock washers. Choosing the appropriate washer enhances the overall clamping force and maintains joint tightness.


Fasteners such as screws, bolts, nuts, rivets, and washers play a vital role in CNC machining. Selecting the right type of fastener ensures efficient assembly, proper load distribution, and long-lasting connections between different components. Understanding the specific requirements of your product, including factors like material compatibility, load-bearing capacity, aesthetics, and environmental conditions, will help determine the most appropriate choice of fasteners. By considering these aspects, manufacturers can ensure the reliability, durability, and functionality of their products. CNC Milling