A Guide to Types of Fasteners in CNC Machining--cncmass.com(difference between 4130 and 4140 steel Hermosa)

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In the realm of machining, specifically CNC (Computer Numerical Control) machining, fasteners play a crucial role. These small yet mighty components are responsible for holding together various parts and ensuring structural integrity in a wide range of applications. In this article, we will delve into the various types of fasteners commonly used in CNC machining processes.

1. Screws:
Screws are widely recognized as versatile fasteners utilized extensively in CNC machining. They consist of three main parts - a spiral-like threaded shaft, a head, and a tip. Screws can be further categorized based on their drive type, including flathead, Phillips, Allen (hex), Torx, and more. Each drive type offers specific advantages and use cases.

2. Bolts:
Like screws, bolts are externally threaded fasteners but differ in that they require a nut to secure two or more parts together. Bolts primarily feature a shank with threads at one end and a head at the other. Common bolt types include hex bolts, carriage bolts, eye bolts, and flange bolts. They find extensive usage where high-strength connections are required.

3. Nuts:
Nuts are internally threaded fasteners designed to mate with bolts and screws. When combined with bolts, nuts offer a reliable means of securing components tightly. Some common types of nuts seen in CNC machining are hex nuts, lock nuts, wing nuts, cap nuts, and T-nuts.

4. Washers:
Washers are thin plate-like components placed between the fastener head/nut and the surface it contacts. They distribute the load evenly, prevent damage, and eliminate loosening due to vibration. Flat washers, split washers, and locking washers are amongst the frequently employed types.

5. Rivets:
Rivets are unique fasteners known for their superior strength and durability. They consist of a cylindrical body with a head on one end and are permanently fastened by deforming or "setting" the opposite end. Rivets find applications in aerospace, automotive, and construction industries where joining materials such as metal sheets is necessary.

6. Inserts:
Inserts, also known as threaded inserts, provide reinforcement to softer materials like plastic or wood, enabling secure attachment to metallic components. Threaded inserts come in various shapes - helical, key-locking, press-in, heat-set, self-tapping, and more – catering to different CNC machining needs.

7. Pins:
Pins serve as an essential component for alignment, positioning, or restraints within CNC assemblies. Dowel pins, roll pins, clevis pins, and hitch pins are examples of pins used frequently based on their reliable design features offering strength and dependability.

8. Clips:
Clips or retaining clips offer quick assembly and disassembly capabilities during CNC machining processes. Common clip types include circlips, e-clips, snap rings, and retaining rings. These fasteners are often utilized in shafts, bores, or grooves to retain specific parts without using nuts or bolts.


In the vast landscape of CNC machining, understanding the various types of fasteners available is crucial to ensure efficient assembly and structural integrity. Screws, bolts, nuts, washers, rivets, inserts, pins, and clips each have their unique characteristics and roles in securing components together. Selecting the appropriate type and size of fastener is vital to optimize performance, reliability, and safety in CNC machining projects. By considering the specific requirements of your application, you can make informed decisions while navigating the world of fasteners in CNC machining. CNC Milling