Exploring the Essential Types of Fasteners for CNC Machining--cncmass.com(tensile strength of metals Leila)

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In the world of CNC machining, fasteners play a crucial role in bringing together various components to create precise and functional products. These small but essential devices come in different shapes, sizes, and materials to cater to diverse manufacturing needs. This article will delve into the types of fasteners used in CNC machining processes, their applications, and provide valuable insights into their production methods.

1. Bolts and Screws:

Bolts and screws are among the most commonly used fasteners in CNC machining. They are distinguished by their external threading (bolts) or internal threading (screws). Their primary function is to join two or more parts securely. Bolts are typically paired with nuts, providing a higher level of resistance against lateral movement or loosening due to vibrations. Screws, on the other hand, offer self-locking features, making them suitable for applications where frequent disassembling may be required.

The production process of bolts and screws involves cold forming or thread rolling from steel wire stock. Cold forming ensures superior strength and precision. Additionally, heat treatment processes enhance hardness, durability, and corrosion resistance.

2. Nuts:

Nuts work in conjunction with bolts and screws to secure objects together. They are internally threaded and come in various designs such as hexagonal nuts, square nuts, and wing nuts. Hexagonal nuts are widely popular due to their ease of use and application across many industries.

Production techniques for nuts involve machining solid hexagonal bars or extrusion processes. The manufactured nuts undergo finishing processes like electroplating or hot-dip galvanizing for improved aesthetics and corrosion resistance.

3. Rivets:

Rivets are permanent fasteners that consist of a cylindrical body and a head. They are extensively used when welding or soldering is not feasible or practical. Rivets are employed in aerospace, automotive, and construction industries to join two or more components together with superior strength and reliability. They can withstand high shear forces and provide exceptional resistance against vibrations.

The manufacturing process of rivets typically involves forming cylindrical bodies from steel wire stock, followed by head formation using multiple automated steps, such as heading machines and trimming processes. Rivets may also undergo surface finishing for enhanced aesthetics and corrosion protection.

4. Washers:

Washers are flat, circular discs that fit between the fastener's head/nut and the workpiece surface. They distribute the load evenly, prevent damage to the workpiece, and enhance stability. The three primary types of washers include plain washers, spring washers, and locking washers. Each type serves a specific purpose, ensuring optimal functionality and safety.

Manufacturing washers generally entails punching out flat disks from sheet metal, followed by deburring and surface finishing processes.

5. Pins:

Pins are slender, cylindrical fasteners used primarily for alignment, positioning, or retaining purposes. They come in various forms like dowel pins, clevis pins, taper pins, and roll pins. These precision-engineered components ensure accurate assembly and facilitate disassembly when necessary.

Producing pins involves machining solid round steel bars into desired lengths, followed by grinding and surface finishing processes. Heat treatment techniques are often applied to improve hardness and durability.


Fasteners play an integral role in CNC machining, providing the essential connections needed for assembling numerous products across diverse industries. Bolts, screws, nuts, rivets, washers, and pins all serve different functions while maintaining structural integrity and reliability. Understanding the production methods behind these fasteners helps optimize their performance and ensures consistent quality in the manufacturing process. By utilizing the appropriate fasteners, CNC machinists and manufacturers can create robust and efficient finished products. CNC Milling CNC Machining