The Fundamental Guide to Fasteners in CNC Machining(plastic prototyping Jenny)

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Fasteners, be it screws, bolts, nuts, or rivets, are an essential part of any mechanical assembly. In the realm of CNC machining, these small yet crucial components play a vital role in holding various parts together and ensuring the structural integrity of the final product. This article aims to explore different types of fasteners used in CNC machining processes, their characteristics, production methods, and their importance in achieving precision and reliability.

Types of Fasteners Used in CNC Machining:

1. Screws:
Screws are versatile and widely used fasteners with helical ridges called threads on their exteriors. These threads enable them to create tighter bonds between two or more components by drilling into one surface while gripping another. CNC machines produce screws using precision turning processes that cut or form the threads onto a cylindrical blank.

2. Bolts:
Similar to screws, bolts have threaded shafts but typically lack tapered heads. The threading allows them to be securely fixed into place using nuts. CNC machining ensures bolt production accuracy by employing intricate milling techniques to shape the bolt's head and thread the shaft precisely.

3. Nuts:
Nuts complement screws and bolts by providing the mating component for secure fastening. These internally threaded devices are manufactured through CNC machining processes such as turning or milling. They are available in various shapes and sizes to accommodate specific application requirements.

4. Rivets:
Rivets are unique fasteners that permanently bind two or more surfaces together, often where welding or screwing is not feasible or desirable. Riveting involves deforming the end of a metal pin (mandrel) inserted through aligned holes, creating a permanent clench. CNC machining can fabricate high-quality rivets through precise hole drilling and forming operations.

Production Methods of Fasteners:

CNC Machining offers several production methods for manufacturing fasteners, including:

1. Turning:
Turning, also known as lathe machining, involves rotating the workpiece while a cutting tool removes excess material to achieve the desired shape. This method is widely used in producing screws, nuts, and bolts due to its ability to create precise threads and intricate geometries.

2. Milling:
Milling utilizes rotary cutters to remove material from a stationary workpiece. It allows for greater complexity and versatility in fastener production by creating slots, holes, threads, and other intricate features. Nuts, bolts, and rivets are often produced using milling techniques.

3. Threading:
Threading is another common production method that specifically focuses on creating threaded fasteners like screws, bolts, and nuts. CNC machines perform various threading operations such as tapping, thread milling, or thread rolling to produce accurate and standardized threads.

Importance of Fasteners in CNC Machining:

Fasteners directly influence product performance, safety, and reliability in CNC machining applications. They provide the necessary clamping force to hold components together under operational stresses and resist loosening due to vibrations or external forces. By ensuring tight connections, fasteners enhance the overall structural integrity and longevity of the machined parts.

Furthermore, choosing appropriate fasteners plays a crucial role in meeting specific industry requirements such as load-bearing capacity, corrosion resistance, temperature tolerances, and electrical conductivity. Proper selection and implementation of fasteners contribute to the efficient functioning of machinery and reduce maintenance issues.


In the realm of CNC machining, fasteners serve as the backbone of mechanical assemblies, providing stability, strength, and precision. Understanding different types of fasteners available, their production methods, and their importance aids in optimal design and manufacturing decisions. CNC technology enables the production of high-quality fasteners that meet stringent specifications and ensure reliable and safe functionality in diverse application areas. CNC Milling CNC Machining