An Insight into Different Types of Fasteners for CNC Machining(standard machining tolerances Tracy)

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In the world of manufacturing and engineering, fasteners play a pivotal role in holding various components together securely. When it comes to CNC machining, understanding the different types of fasteners becomes essential as they are crucial in ensuring structural integrity and precision within machined parts. In this article, we will explore the various types of fasteners used in CNC machining and their significance in the production process.

1. Bolts:
Bolts are one of the most common fasteners utilized in CNC machining applications. They consist of a cylindrical body with a threaded section at one end, while the other end is typically rounded or flat with a head for tightening purposes. Bolts can be distinguished based on their head types such as hexagonal, square, or round, and are often paired with nuts to secure two or more components together.

2. Screws:
Similar to bolts, screws are generally smaller in size and have a threaded shaft along their entire length. They are employed when there is no need for an accompanying nut. Their primary function is to create a secure joint by penetrating through the material being fastened, forming a tight mating relationship that resists loosening due to vibration or load.

3. Nuts:
Nuts are fasteners primarily designed to pair with bolts or screws. They typically have a hexagonal shape with internal threading corresponding to the bolt or screw they accompany. The inclusion of a nut allows for the adjustment of tension and provides additional support for the fastener assembly, resulting in enhanced strength and stability.

4. Washers:
Washers are thin circular plates with a hole in the center. They are placed between the nut and surface material during CNC machining to distribute the load evenly across the contact area. This aids in preventing damage to delicate materials, controlling frictional forces, and maintaining consistent torque application.

5. Rivets:
Rivets are permanent fasteners widely used in CNC machining and other manufacturing techniques. They consist of a cylindrical shaft with a head at one end, which when inserted into pre-drilled holes, deforms the opposite end to secure components together tightly. Rivets find applications where disassembly is not required, ensuring joints remain sturdy even under harsh conditions.

6. Inserts:
Inserts, also known as threaded inserts or helical inserts, provide durable threads within soft materials such as plastics or wood. These inserts are often made from metals like brass or stainless steel and enable easy assembly and disassembly without damaging the material during repetitive usage. CNC machines can create precise threads, making inserts indispensable in creating strong connections for these softer materials.

7. Pins:
Pins, usually cylindrical in shape, are commonly employed to position parts accurately during CNC machining processes. They ensure component alignment and prevent unwanted movement, especially while drilling or machining complex geometries. Precision pins made from hardened steel guarantee accuracy, stability, and repeatability in machined parts.


Fasteners play a vital role in CNC machining, providing strength, integrity, and precision to assembled components. From bolts and screws to nuts and rivets, each type has its own unique purpose in securing parts firmly together. By understanding the various types of fasteners available, manufacturers can ensure reliable performance, efficient production, and durable products in the world of CNC machining. CNC Milling