Understanding the Different Types of Fasteners Used in CNC Machining--cncmass.com(insert injection molding Felix)

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In the world of manufacturing and CNC machining, fasteners play a crucial role in holding various components together. These small but vital parts ensure structural integrity, enable disassembly for maintenance or repairs, and contribute to overall product quality. In this article, we will delve into the different types of fasteners used in CNC machining and explore their characteristics, functions, and production processes.

1. Screws:
Screws are perhaps the most commonly used fasteners in CNC machining due to their versatility and ease of use. They feature a helical thread wrapped around a cylinder-shaped body. Screws can be further categorized into different types, such as wood screws, machine screws, self-tapping screws, and socket head cap screws. Each type serves specific purposes based on the material being joined and the required strength.

To produce screws, CNC machining utilizes precision cutting tools to create the threads accurately. The process involves turning a rod of suitable material, like stainless steel, aluminum, or titanium, followed by milling the head shape and applying surface finishes.

2. Bolts:
Bolts are similar to screws but differ primarily in their application. Unlike screws that fit into pre-threaded holes, bolts pass through matching openings, secured with nuts on the opposite side. They provide stronger joints and are often used for load-bearing applications. Common types of bolts include hexagonal bolts, carriage bolts, and eye bolts.

The production process for bolts is similar to screws. However, bolt heads are typically larger and may require additional steps such as drilling holes for recessed heads or creating shank features such as ribs or flanges for added stability.

3. Nuts:
Nuts complement bolts by providing a threaded mating partner, allowing for secure and adjustable connections. Like bolts, nuts come in various designs such as hexagonal nuts, wing nuts, and lock nuts. They are typically made from steel, brass, or other materials with high tensile strength.

CNC machining produces nuts by turning cylindrical stock material to the desired outer shape and then employing different tooling techniques to create threads that match the corresponding bolts. This precision process ensures optimal thread engagement and reliable connections.

4. Washers:
Washers are flat, disc-shaped components used in conjunction with screws, bolts, and nuts. They distribute the load over a broader surface area, prevent damage to the fastened material, and provide a secure fit. Common types of washers include flat washers, lock washers, and spring washers.

To produce washers, CNC machines precisely cut discs from sheet metal or bar stock materials. Depending on the washer type required, additional features like teeth or grooves may be added during the machining process.

5. Rivets:
Rivets offer an alternative method for joining two or more components without requiring internal threading. They consist of a cylindrical body with a pre-installed head at one end. Rivets are inserted into pre-drilled holes and secured by deforming the opposite end through pressure or heat. They provide strong and permanent connections, making them suitable for high vibration environments or applications subject to extreme stress.

CNC machining produces rivets by cutting rods or bars into appropriate lengths, forming heads, and adding any necessary grooves or textures. The resulting parts are then ready for installation using pneumatic or manual tools.


In CNC machining, the selection of the right fasteners is crucial for achieving durable and reliable product assemblies. Whether it's screws, bolts, nuts, washers, or rivets, each type serves unique purposes based on their design and application requirements. Understanding their characteristics, functions, and production processes helps manufacturers make informed decisions when incorporating fasteners into CNC machined products. CNC Milling CNC Machining