Exploring Various Types of Fasteners Used in CNC Machining(which is stronger brass or bronze Paul)

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CNC machining, an abbreviation for Computer Numerical Control machining, is a versatile manufacturing process that involves the use of computer programs to control machine tools and create intricate components or products. This technology has revolutionized various industries, including aerospace, automotive, electronics, and more. In CNC machining, fasteners play a critical role in securely joining different parts together. This article will delve into the different types of fasteners used in CNC machining and their significance in this manufacturing technique.

1. Screws:
Screws are cylindrical-shaped fasteners with spiral ridges (threads) on the outer surface. They are commonly used in CNC machining as removable fastenings to join two pieces of material together. The threads on screws allow them to firmly hold materials when tightened. There are various types of screws, including machine screws, self-tapping screws, socket head cap screws, and more. Each type offers specific benefits depending on the application requirements such as strength, resistance to corrosion, and ease of installation.

2. Bolts:
Bolts are similar to screws but differ in their usage. While screws are typically inserted into tapped holes, bolts require nuts to secure them in place. Bolts have external threads, while nuts have internal threads, allowing them to interlock with each other. CNC machining utilizes bolts to create robust connections between multiple components. Similar to screws, there are several varieties of bolts available, such as hex bolts, carriage bolts, eye bolts, and shoulder bolts. These variations cater to specific needs concerning load-bearing capacity, aesthetics, and assembly convenience.

3. Nuts:
Nuts, mentioned above, complement bolts by providing a female threaded hole for secure fastening. They are essential elements in CNC machining, especially when modular structures need easy disassembly or reassembly. Nuts come in diverse shapes, sizes, and materials. Common types include hex nuts, locknuts, wing nuts, and flange nuts. These variations offer distinct advantages such as vibration resistance, self-locking mechanisms, improved gripping ability, and heat or chemical resistance.

4. Rivets:
Rivets serve as permanent fasteners in CNC machining. They are extensively used to attach two or more materials together when welding or screwing is not suitable. Rivets consist of a cylindrical shaft with a head at one end that gets deformed after insertion, creating a secure joint. The application of rivets requires special tools to ensure proper installation. Flush rivets, blind rivets, solid rivets, and tubular rivets are some commonly employed varieties. Their reliability, high load-bearing capacity, and resistance to shear forces make them ideal for aerospace, transportation, and structural applications.

5. Inserts:
CNC machining often involves working with different materials of varying properties, strengths, and threaded holes. Inserts allow manufacturers to establish reliable threads in relatively weak or delicate materials like plastics or composites. Inserts are usually made from metals such as brass or stainless steel, providing durable female threads that can accommodate screws or bolts securely. Threaded inserts enhance the overall assembly's strength while reducing wear on softer materials during repeated disassembly or maintenance operations.


Fasteners play an indispensable role in CNC machining, enabling strong and reliable connections between components or materials. The five types of fasteners discussed above -- screws, bolts, nuts, rivets, and inserts -- cater to different requirements based on their unique designs and characteristics. From removable fastenings to permanent, load-bearing joints, each fastener type serves a specific purpose in CNC machining processes across various industries. By understanding the functions and applications of these fasteners, manufacturers can optimize their CNC machining practices for efficient production and quality output. CNC Milling