Overview of Types of Fasteners Used in CNC Machining--cncmass.com(press fit Luther)

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Fasteners are essential components used in various industries, including manufacturing, construction, automotive, and aerospace. They play a crucial role in holding different parts together and ensuring structural integrity. In the world of CNC machining, fasteners are extensively utilized to assemble complex machinery and equipment. This article aims to provide an overview of the types of fasteners commonly employed in CNC machining processes.

1. Bolts and Nuts:

Bolts and nuts form the backbone of mechanical fastening systems. These fasteners consist of externally threaded bolts and internally threaded nuts that work in tandem. CNC machines, with their precision cutting capabilities, produce bolts and nuts according to custom specifications. Materials such as stainless steel, aluminum, or alloy steel can be used, depending on the required strength and durability.

2. Screws:

Screws are versatile fasteners known for their self-locking nature and excellent resistance to loosening under vibration. Common screw types used in CNC machining include machine screws, wood screws, and sheet metal screws. Machine screws are typically used for securing thin materials or components together, while wood screws are specifically designed for use with wooden surfaces. Sheet metal screws offer great flexibility when joining metals without the need for pre-drilling.

3. Rivets:

Rivets excel in applications where welding or soldering may not be feasible or practical. These cylindrical pins have a head at one end and are inserted through aligned holes in the materials being joined. The protruding ends are then hammered or pressed to secure the connection permanently. CNC machining allows for precise production of rivet holes, enhancing their effectiveness in assembling structures subjected to high shear forces.

4. Washers:

Washers act as flat discs placed between the fastener and the material surface, offering several advantages. Firstly, they distribute loads evenly, preventing localized stress concentrations that can weaken the assembly. Secondly, washers protect softer materials from damage caused by the fastener. CNC machining ensures accurate sizing and shape customization of washers to meet specific requirements.

5. Pins:

Pins are cylindrical fasteners designed for applications requiring rotational movement or joining two components temporarily. CNC machining allows producing various types of pins, such as dowel pins, taper pins, and split pins (cotter pins). Dowel pins provide precise alignment between parts, ensuring proper assembly. Taper pins are used when a locking rigid joint is necessary, while split pins can secure bolts or axles by passing through them.

6. Inserts:

Threaded inserts enhance the functionality and longevity of assemblies where frequent disassembling and reassembling may occur. These metal inserts are inserted into pre-drilled holes in materials, providing durable threads without damaging them during repeated use. CNC machining guarantees precisely sized insert holes for optimal performance and ease of installation.

7. Clips and Clamps:

Clips and clamps offer temporary or semi-permanent connections without causing any damage to the materials involved. They are widely used in CNC machining to hold down workpieces onto the machine table, preventing undesired movement during cutting operations. Spring clips, toggle clamps, and C-clamps are common examples that benefit from the precision manufacturing provided by CNC machines.


Fasteners are fundamental elements in the CNC machining process, enabling the construction of strong and reliable structures. Understanding the different types allows manufacturers to choose suitable fasteners based on specific application requirements. Whether it's bolts and nuts, screws, rivets, washers, pins, inserts, or clips and clamps, CNC machining ensures precise production to achieve optimal results. The versatility and reliability of these fasteners play a pivotal role in maintaining the integrity and functionality of countless machinery and equipment across various industries. CNC Milling