Understanding the Different Types of Fasteners Used in CNC Machining--cncmass.com(what are rivets used for Glenn)

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Fasteners play a crucial role in various industries, including CNC machining. These essential components are used to join different parts and ensure secure connections in a wide range of applications. In this article, we will explore the different types of fasteners commonly utilized in CNC machining processes.

1. Bolts and Screws:

Bolts and screws are widely employed in CNC machining due to their versatility and strength. These threaded fasteners provide a non-permanent connection and can be easily installed or removed using a wrench or screwdriver. Bolts generally have larger heads and require nuts for securing, while screws feature smaller heads that can be tightened directly into pre-drilled holes. They come in various sizes, lengths, and materials, making them suitable for different CNC projects.

2. Nuts:

Nuts are companion fasteners used in conjunction with bolts to secure objects together via threaded connections. These small, often hexagonal-shaped components act as female receptacles and help distribute the load evenly across the joint, ensuring stability. Like bolts, nuts also come in diverse styles, such as standard nuts, locknuts, wing nuts, and flange nuts, each serving specific purposes based on the application requirements.

3. Washers:

Washers are flat, thin discs with central holes that are typically placed between the head of a bolt or screw and the mating surface. They serve multiple functions, such as distributing pressure, preventing loosening or damage, reducing friction, and creating a smooth bearing surface. Common washer types include flat washers, lock washers, split-lock washers, and toothed washers, catering to different fastening needs in CNC machining.

4. Rivets:

Rivets are permanent fasteners that join two or more materials by deforming one end of the rivet shaft to clamp them together securely. Unlike bolts or screws, which create connections through threads, rivets rely on a mechanical bond and are typically applied in high-stress joints or areas inaccessible from both sides. CNC machining can automate the installation of rivets, reducing cost and ensuring precision.

5. Adhesive Fasteners:

Adhesive fasteners employ adhesives or glues to attach components together, thereby eliminating the need for traditional mechanical fastening methods. These fasteners provide excellent aesthetic appeal as they remain hidden beneath surfaces, resulting in a smooth finish. They also distribute stress uniformly and reduce the risk of corrosion since there are no holes or exposed surfaces. However, adhesive fasteners may not be suitable for all CNC applications due to specific material limitations and environmental conditions.

6. Clamps:

Clamps are temporary fasteners often used during production processes to hold workpieces securely in place. While clamps do not provide permanent connections like bolts or screws, they ensure stability and precision during the CNC machining operations. Various clamp designs, such as spring clamps, bar clamps, C-clamps, and toggle clamps, adapt to different workpiece sizes and shapes, allowing for efficient and accurate manufacturing.


In CNC machining, an array of fasteners including bolts, screws, nuts, washers, rivets, adhesive fasteners, and clamps serves diverse purposes, enabling secure connections and precise assembly. Understanding the characteristics, applications, and advantages of each type is crucial for achieving reliable and robust results in CNC machining projects. By selecting the appropriate fasteners based on specific requirements, manufacturers can optimize productivity, enhance product quality, and ensure the utmost safety and functionality. CNC Milling