A Comprehensive Guide to Different Types of Fasteners in CNC Machining--cncmass.com(tack weld symbol Pamela)

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CNC machining, also known as computer numerical control machining, is an advanced manufacturing process that utilizes automation and precise cutting tools to create custom parts and components. Fasteners play a crucial role in this process, ensuring secure connections and reliable functionality of the final products. In this article, we will dive into the world of fasteners used in CNC machining, exploring their various types, functions, and production processes.

Different Types of Fasteners in CNC Machining:

1. Bolts and Screws:
Bolts and screws are common fasteners used in CNC machining applications. Bolts have external threads, whereas screws have internal threads. They come in various sizes, lengths, thread pitches, and head styles to accommodate different requirements.
The production of bolts and screws involves machining the raw material into cylindrical blanks. The threads are then cut using precision threading tools or through rolling methods. Additional heat treatment may be applied for enhanced strength.

2. Nuts:
Nuts are complementary fasteners designed to mate with bolts and screws. Like bolts, nuts also come in a wide range of sizes and shapes. Hexagonal, square, and round nuts are commonly used in CNC machining. Their production involves machining solid bars into smaller cylindrical blanks, which are then threaded using precision tools or specialized tapping machines.

3. Washers:
Washers are small flat discs with a hole in the center. They provide additional stability, distribute loads, and prevent surface damage between fasteners and the materials they join. In CNC machining, washers can be standard circular flat washers, spring washers, or lock washers. These are typically manufactured by stamping or laser cutting processes from sheets of metal, such as stainless steel or aluminum.

4. Rivets:
Rivets are permanent mechanical fasteners often used when welding or screwing is not feasible due to material or design constraints. They consist of a cylindrical shaft with a head on one end and are usually made from materials like aluminum, steel, or copper alloys. Riveting involves using heat or mechanical tools to deform the unheaded portion of the rivet, creating a secure connection between two or more parts.

5. Pins:
Pins, including dowel pins and taper pins, are used for accurate alignment and assembly of CNC machined components. Dowel pins provide precise positional accuracy, while taper pins offer a wedging action for a tight fit. These pins are typically manufactured by machining solid bars into desired lengths and profiles, followed by subsequent processes such as heat treatment or surface finishing.

6. Inserts:
Inserts, often made of brass, stainless steel, or hardened metals, improve thread strength in softer materials like plastic or wood. The most common type is helical inserts, which are coiled wires with internal threads that can be screwed into pre-cut holes. Other types include self-tapping threaded inserts and key-locking inserts, each serving specific applications.

Production Process of Fasteners:

CNC machining plays a significant role in producing fasteners. Computer-controlled machines efficiently execute operations like cutting, drilling, threading, milling, and grinding during the manufacturing process. Precise measurements ensure the required tolerances are met, resulting in consistent quality.

To produce threaded fasteners, precision threading operations are utilized. Threading taps or dies may carve out threaded patterns on raw material blanks to create bolts, screws, nuts, and inserts.

For washers and stamped metal products, CNC punching or laser cutting techniques are employed. These methods allow for rapid production, high accuracy, and intricate designs.

Rivets and pins are typically produced through various machining processes. Cutting, turning, and heat treatments shape the raw materials into the desired forms. Cold-heading processes are utilized for making pins.


In the world of CNC machining, fasteners are an indispensable component, ensuring reliable connections and proper functionality. Bolts, screws, nuts, washers, rivets, pins, and inserts provide versatile options for various applications. Understanding the different types of fasteners and their production processes is essential for achieving optimal results in CNC machining projects. By utilizing precise machines and techniques, manufacturers can consistently produce high-quality fasteners that meet specific requirements. CNC Milling