Understanding the Different Types of Fasteners for CNC Machining--cncmass.com(automotive fastener Leopold)

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CNC machining is a widely used manufacturing process that utilizes computer-controlled machines to cut and shape various materials with precision. One crucial aspect of CNC machining is the use of fasteners, which play a vital role in holding different components securely together during the machining process. In this article, we will explore the various types of fasteners commonly employed in CNC machining.

1. Bolts and Screws:
Bolts and screws are ubiquitous types of fasteners used across industries. They provide secure connections and come in various sizes and shapes. When it comes to CNC machining, bolts and screws serve as primary connectors, providing stability and strength to the assembled parts. Whether it's hex bolts, socket head cap screws, or machine screws, each has its specific purpose depending on the application requirements.

2. Nuts and Washers:
Nuts and washers complement bolts and screws by facilitating proper tightening and preventing the loss of tension due to vibrations. CNC machined parts often incorporate nuts and washers to ensure secure fastening. Locknuts, flange nuts, and wing nuts are common choices that offer reliable thread engagement and convenience in assembly and disassembly processes.

3. Rivets:
Rivets are cylindrical fasteners used to join two or more materials permanently. These mechanical fasteners require no additional tools for installation and can withstand high loads. Within CNC machining, riveting finds applications where welding or adhesive bonding may not be feasible or suitable due to material characteristics or design constraints. The most popular types include solid rivets, blind rivets, and tubular rivets.

4. Inserts:
Threaded inserts enhance the versatility of CNC machined parts by providing durable threads within softer materials or ensuring strong screw connections when self-threading is undesirable. By embedding these inserts into drilled holes or molded recesses, designers broaden the range of subsequent fastening options. Key types of inserts include self-tapping, heat-set, and press-fit inserts.

5. Clips and Clamps:
In CNC machining, clips and clamps are employed to hold components securely in place during the machining process. These temporary fasteners allow easy removal for finishing operations or when replacing a part within an assembly. Examples include toggle clamps, spring clips, and C-clips, which exert tension or compression forces to maintain positional stability.

6. Dowels and Pins:
Dowels and pins provide precise alignment between two parts while offering resistance to lateral movement. CNC machined assemblies often incorporate dowel pins to ensure accurate positioning, primarily when multiple parts need to be joined precisely. Depending on specific design requirements, CNC machining can produce straight pins, taper pins, and groove pins.


Fasteners play a crucial role in CNC machining by providing reliable connections between various components. Bolts, screws, nuts, washers, rivets, inserts, clips, clamps, dowels, and pins offer versatility and durability in joining materials and securing parts accurately. Understanding their unique characteristics enables CNC machine operators and designers to choose the most appropriate fastening solutions that best meet their application requirements. By utilizing these different types of fasteners effectively, the quality and precision of CNC-machined products can be enhanced, resulting in optimal functionality and customer satisfaction. CNC Milling