Understanding Different Types of Fasteners used in CNC Machining--cncmass.com(bended sheet Jocelyn)

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CNC machining has revolutionized the manufacturing industry, enabling precise and efficient fabrication of various components. One crucial aspect of CNC machining is the use of fasteners, which play a vital role in securing and assembling parts. In this article, we will delve into the different types of fasteners commonly used in CNC machining processes.

1. Bolts:
Bolts are threaded fasteners with a head and external threads, intended to be used with nuts for securing two or more objects together. CNC machining utilizes bolts made from various materials such as steel, stainless steel, brass, or even specialized alloys depending on the application's requirements. Lengths, thread sizes, and the type of bolt heads may vary significantly, further emphasizing their versatility.

2. Nuts:
Nuts are internally threaded fasteners that counterpart bolts. They can secure and attach multiple objects by threading onto bolts, offering stability and strength. CNC machining uses different types of nuts, including hexagonal, square, wing, and flange nuts. Like bolts, nuts can also be fabricated from various materials to meet specific environmental or functional demands.

3. Screws:
Screws are similar to bolts but differ in functionality since they can tap their holes while creating threads themselves. CNC machining employs screws to fasten objects where pre-existing holes are absent. The variations include machine screws, wood screws, self-tapping screws, and sheet metal screws based on intended usage.

4. Washers:
Washers provide smooth bearing surfaces beneath nuts and bolts, preventing damage caused by friction while maintaining even loads across the joined surfaces. Standard washers for CNC machining include flat washers, usually in metallic form, although plastic washers might be appropriate for certain applications where electrical insulation or corrosion resistance is necessary.

5. Rivets:
Rivets are permanent mechanical fasteners used extensively in CNC machining where welding or adhesives are impractical. These fasteners consist of a cylindrical shaft topped by a head, and they require access to both sides of the assembly for installation. Rivets offer robust shear and tensile strength, making them ideal for aircraft components, automotive frames, and structural panel assemblies.

6. Inserts:
Inserts provide durable threads in softer materials such as plastic, wood, and composite structures. CNC machining utilizes inserts made from brass, stainless steel, and other high-strength alloys. The insertion process typically involves heating the insert, pressing it into the designated hole, and allowing it to cool down, resulting in an effectively reinforced threaded area.

7. Pins:
Pins come in various designs and configurations suitable for specific applications within CNC machining. They can aid in alignment, connection, or rotation control of assembled parts. Dowel pins, taper pins, clevis pins, and spring pins are commonly used in this field.

8. Retaining Rings:
Retaining rings, also known as circlips or snap rings, secure components onto shafts or inside housings. CNC machining relies on retaining rings to prevent axial movement of bearings, gears, and other rotational components. This versatile fastener option is available in internal (for bores) and external (for shafts) forms, providing excellent retention capabilities.


Understanding the different types of fasteners used in CNC machining processes is essential for efficient manufacturing and assembly operations. Whether it be bolts, nuts, screws, washers, rivets, inserts, pins, or retaining rings, each plays a vital role in securing components together reliably. By utilizing these fasteners appropriately, manufacturers can ensure precise machining outcomes while meeting their unique requirements with regard to functionality, strength, and environmental considerations. CNC Milling CNC Machining