Understanding the Types of Fasteners in CNC Machining--cncmass.com(rivetted joints Daniel)

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When it comes to CNC machining, fasteners play a crucial role in ensuring that components are securely held together. From simple screws and bolts to complex rivets and threaded inserts, the choice of fasteners can greatly affect the overall strength, durability, and functionality of a machined product. In this article, we will delve into the world of fasteners used in CNC machining, exploring their different types, functions, and production processes.

Types of Fasteners:

1. Screws:
Screws are one of the most common types of fasteners used in CNC machining applications due to their versatility. They consist of a threaded cylindrical shaft with a head, allowing them to be easily inserted or removed using various tools like screwdrivers or wrenches. Different types of screws include machine screws, self-tapping screws, wood screws, and more, each designed for specific applications.

2. Bolts:
Similar to screws, bolts also feature external threading on their shafts. However, they differ in their structure as bolts require separate nuts to secure two or more components tightly. This enables faster disassembly and reassembly compared to screws, making bolts ideal for applications where frequent adjustments or replacements are required.

3. Rivets:
Rivets are permanent fasteners commonly used in CNC machining to join two or more materials permanently. They consist of a smooth cylindrical body, commonly made of metal, with a mandrel or nail-like pin passing through it. During installation, the rivet is deformed by applying pressure, creating a tight, strong joint. Rivets find extensive use in industries such as aerospace and automotive manufacturing.

4. Threaded Inserts:
Threaded inserts are small, cylindrical metal pieces featuring internal threads that provide durable connections within softer materials like plastic or wood. These inserts act as anchors for screws or bolts, enhancing the grip of the fastener within the base material. Threaded inserts are often used when a component needs to be attached or detached multiple times while maintaining sufficient strength and integrity.

5. Nuts:
Nuts are internally threaded fasteners that work in conjunction with bolts or screws for secure fastening. They come in various shapes, such as hexagonal nuts (most common), square nuts, wing nuts, and more, each suited for specific applications. Nuts ensure consistent clamping force by creating resistance against loosening due to vibration or external forces.

Production of Fasteners:

Fastener production involves several stages, including design, material selection, manufacturing processes, and quality control. Here is an overview of the typical production process for fasteners:

1. Design and Material Selection:
Based on the requirements of the application, engineers determine the ideal type, size, and material of the fastener. Factors considered include load-bearing capacity, environmental conditions, corrosion resistance, aesthetics, and cost-effectiveness.

2. Manufacturing Processes:
The production process may involve different techniques depending on the desired type of fastener. Common methods include cold heading (forming metal parts by pressing through dies), machining, forging, casting, rolling, or extrusion.

3. Heat Treatment and Surface Coating:
Heat treatment processes like annealing, hardening, or tempering are employed to improve mechanical properties such as hardness, strength, and elasticity. Additionally, surface coatings such as zinc plating, galvanization, or powder coating are applied to enhance corrosion resistance and provide aesthetic appeal.

4. Quality Control:
To ensure high-quality fasteners, stringent checks are performed throughout the production process. This includes dimensional inspections, tensile and shear strength testing, metallurgical analysis, corrosion resistance assessment, and overall compliance with industry standards.


Understanding the types of fasteners used in CNC machining is crucial for ensuring optimal performance, durability, and safety of machined products. From screws and bolts to rivets and threaded inserts, each fastener type serves a distinct purpose in joining components securely. By considering the application-specific requirements and undergoing careful material selection and manufacturing processes, high-quality fasteners can be produced to meet the needs of various industries. CNC Milling