The Essential Guide to Types of Fasteners in CNC hole Annabelle)

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CNC machining is a precise and efficient method used in various industries for manufacturing parts and components. One critical aspect of this process is the usage of fasteners, which are indispensable for holding different elements together. In this comprehensive guide, we will explore the types of fasteners commonly used in CNC machining and discuss their applications, benefits, and production processes.

1. Screws:
Screws are threaded fasteners primarily used for securing two or more objects together. They come in numerous variations including machine screws, self-tapping screws, wood screws, and set screws. Machine screws are typically used with tapped holes and pre-threaded nuts, while self-tapping screws cut their thread within the material itself. Wood screws feature wide threads for better grip in wooden structures, whereas set screws have no head and often secure rotating components onto shafts.

2. Bolts:
Bolts are larger-sized fasteners designed to provide higher tensile strength. These fasteners have a threaded shaft and require a nut for assembly. Common types of bolts include hex bolts (commonly found in construction), carriage bolts (with a smooth rounded head), and eye bolts (featuring a loop at one end). Depending on the application, bolts can be further classified into grade classes based on their strength properties.

3. Nuts:
Nuts are internally threaded fasteners designed to be used with screws or bolts. Their primary purpose is to securely hold the bolt or screw in place. Hex nuts, also known as hexagonal nuts, are the most common type due to their versatile nature and widespread use across industries. Other specialized nuts include lock nuts (which prevent loosening under vibration) and wing nuts (designed for easy tightening/loosening by hand).

4. Washers:
Washers serve multiple purposes in CNC machining. These thin plates help distribute the load of fasteners, protect surfaces from damage, and provide a smoother assembly. Flat washers, split lock washers, and spring washers are widely used in various applications. Split lock washers possess teeth that dig into materials to resist loosening under vibration, while spring washers apply tension to maintain tightness.

5. Rivets:
Rivets are permanent fasteners used for joining two or more materials together without requiring access to both sides. They consist of a smooth shaft with a head at one end and require deformation during installation for a secure fit. Solid rivets and blind rivets (also known as pop rivets) are commonly used types. Solid rivets are heated and hammered into place, creating an everlasting connection. Conversely, blind rivets feature a mandrel inserted through the body, which is then pulled to deform the tail, providing a strong joint even if access to the other side is restricted.

Production Processes:

The production of fasteners depends on their type and material. For standard screws and bolts, cold forming processes like thread rolling are often employed. Hot forging methods are suitable for producing high-strength screws, bolts, and nuts. Specialized fasteners may undergo additional steps such as heat treatment to enhance their mechanical properties. Surface treatments like coating, plating, or painting are also applied to prevent corrosion and increase durability.


In CNC machining, the selection of appropriate fasteners is vital to ensure seamless assembly and reliable functioning of parts and components. Understanding the different types of fasteners available, their uses, and the production processes involved can significantly aid in optimizing manufacturing processes. From screws and bolts to nuts and rivets, each fastener has its own unique purpose and characteristics, contributing to the overall success and efficiency of CNC machining operations. CNC Milling CNC Machining