Exploring Various Types of Fasteners Used in CNC Machining--cncmass.com(injection moulding car parts Charles)

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Fasteners play a vital role in the world of manufacturing and engineering. These essential components enable the secure assembly of different parts, ensuring the structural integrity of products. In the realm of computer numerical control (CNC) machining, fasteners find extensive application and come in various types to cater to specific requirements. This article aims to shed light on the different types of fasteners used in CNC machining, their essential features, and practical implementation.

1. Screws:
Screws are one of the most commonly used fasteners in CNC machining due to their versatile nature and ease of implementation. They consist of a threaded shaft with ridges called threads that securely hold two or more objects together through rotational motion. Furthermore, screws can be either machine screws or self-tapping screws depending on their intended use. Machine screws are designed to fit inside pre-threaded holes, while self-tapping screws create their own threads when inserted into unthreaded materials.

2. Bolts:
Similar to screws, bolts also feature a threaded shaft. However, they differ from screws as they require a nut for proper assembly. Bolts are primarily used when joining two or more separate components together, requiring high levels of tensile strength. Their design includes a smooth portion below the head, which fits into matching holes within the assembled objects. Nuts are tightened onto the bolt using wrenches or other tools, creating a strong and secure connection.

3. Nuts:
Nuts serve as counterparts to bolts, providing a means to tighten and secure them. Primarily hexagonal in shape, nuts have internal threading that allows them to mate with bolts. The accurate size and pitch of the threaded hole ensure a snug fit, preventing any accidental loosening during operation. Different types of nuts such as locknuts, wing nuts, and cap nuts offer additional functionality in terms of stability and usability.

4. Washers:
Washers are flat, typically circular components used in CNC machining to distribute the load of a fastener across a larger area. They prevent damage to materials by reducing stress concentrations when fasteners are tightened. Furthermore, washers can act as spacers or insulating barriers between different components, preventing direct metal-to-metal contact and minimizing frictional forces.

5. Rivets:
Rivets are permanent fasteners commonly used where disassembly is not required. With two separate parts to hold together, rivets feature a head on one end and an unthreaded shank extending through pre-drilled holes in the assembled objects. The opposite end is then deformed (usually with a hammer or specialized tool) to create a secondary head, creating a tight and immovable attachment.

6. Pins:
Pins are cylindrical fasteners typically used for alignment purposes and providing rotational movement in CNC machining. Dowel pins ensure accurate positioning during assembly while taper pins facilitate secure fits within tapered holes. These types of pins allow easy disassembly when needed, making them suitable for applications requiring frequent component changes or adjustments.

7. Clips:
Clips, also known as retaining clips or spring clips, serve to secure fasteners or other components in place. Their unique design allows for easy removal and reinstallation without the need for additional tools. Popular examples include hairpin clips and circlips that fit securely into grooves or shafts.


CNC machining demands the use of various types of fasteners to ensure precise and reliable assembly of components. Understanding the features, functions, and appropriate implementations of screws, bolts, nuts, washers, rivets, pins, and clips plays a pivotal role in optimizing manufacturing processes. By considering the specific requirements and properties of each type of fastener, CNC machinists and engineers can achieve seamless integration and enhance the overall quality and durability of their products. CNC Milling