Exploring the Different Types of Fasteners in CNC Machining--cncmass.com(cnc lathe machines Will)

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CNC machining has revolutionized various industries, allowing for precise and efficient production of complex parts. From automotive to aerospace, this technology plays a crucial role in delivering high-quality components. One vital aspect of CNC machining is the use of fasteners, which are essential for joining different parts together securely. In this article, we will delve into the world of fasteners used in CNC machining, exploring their types, applications, and production process.

1. The Importance of Fasteners in CNC Machining:

Fasteners play a vital role in ensuring structural integrity and reliability in CNC machined products. They provide strength by holding assemblies together securely, resisting external forces such as vibrations, torque, and tension. Whether it's an aircraft engine or a custom-designed machine part, the choice of fastener greatly impacts the overall performance and longevity of the product.

2. Common Types of Fasteners Used in CNC Machining:

a) Screws: Screws are versatile threaded fasteners that join two or more parts firmly. They commonly feature a slotted or Phillips head, enabling easy installation with a screwdriver. Self-tapping screws create threads in pre-drilled holes within the material itself. Machine screws, on the other hand, require tapped holes.

b) Bolts: Bolts are similar to screws but possess no integrated heads. Typically, bolts require nuts to secure them in place, making them suitable for heavy-duty applications where increased strength and load-carrying capacity are required.

c) Nuts: Nuts are internally threaded fasteners designed to mate with bolts. They come in various shapes and sizes, including hexagonal, square, or winged designs, providing ease of tightening using wrenches or even fingers in certain cases.

d) Washers: While not always considered standalone fasteners, washers play a critical role in concentrated load distribution and reducing friction. They prevent damage to the material being fastened and enhance the overall stability of assemblies.

e) Rivets: Rivets are non-threaded fasteners widely used in CNC machining for permanent joints. They consist of a cylindrical shaft with a head on one end. The installation process involves deforming or upsetting the non-headed end, creating a bulge that holds the parts together.

f) Dowel Pins: Dowel pins are cylindrical rods designed to precisely align two or more mating components during assembly. They offer exceptional accuracy and ensure that parts fit perfectly together, eliminating misalignment issues that may affect function or performance.

3. Criteria for Choosing Fasteners:

When selecting the appropriate fastener for CNC machining applications, several factors need consideration, such as:

a) Strength requirements: Determine the maximum load capacity and stress requirements to choose fasteners capable of handling the expected forces.

b) Material compatibility: Consider the properties of the base materials being joined, ensuring the fastener materials complement each other to avoid corrosion or weakening due to galvanic reactions.

c) Environmental factors: Analyze factors like temperature variations, humidity levels, exposure to chemicals, and harsh conditions. Choose fasteners that can withstand these environmental effects consistently.

d) Aesthetic considerations: In certain industries, such as automotive or consumer electronics, visual appearance is crucial. Selecting fasteners that match the design aesthetic can enhance the overall product appeal.

4. Production Process of Fasteners:

Fasteners are produced through several manufacturing methods depending on the type and size required:

a) Machining: CNC milling or turning processes eliminate bulk material from bar stock or billets to produce screws, bolts, and specially-designed fasteners.

b) Cold Heading: Utilizing a cold heading machine, metal wire is automatically fed into the device, where it's cut, headed, and formed into different shapes by powerful presses.

c) Stamping: Stampings use a die and press setup to cut or form fasteners from sheet metal. This process is commonly used for washers, clips, and other thin-profiled fasteners.

d) Forging: Large-scale production of high-strength bolts and studs often involves forging processes in which solid metal blanks are shaped using heat and pressure.


Fasteners play a crucial role in CNC machining, ensuring the stability and integrity of assembled components. The type of fastener chosen depends on factors like strength requirements, material compatibility, and environmental conditions. Through various manufacturing methods such as machining, cold heading, stamping, and forging, fastener producers create a wide array of reliable products. By understanding the different types of fasteners available and their suitability for specific applications, manufacturers can optimize their CNC machining processes and produce durable and efficient end-products. CNC Milling CNC Machining