PEM Series Standard Fastener Factory

What do standard fasteners do?

Standard fasteners play a vital role in industry, construction, machine manufacturing, electronic equipment, automotive industry, aerospace and daily life. Their role is not limited to simple connection and fixation, but also includes the following aspects:

Structural Connections: Standard fasteners are used to join various structural components such as metal sheets, pipes, frames, etc. They are indispensable elements in architectural and engineering structures, ensuring their stability and safety.
Mechanical assembly: In the field of machinery manufacturing, fasteners are used to assemble different mechanical parts together, such as engines, gearboxes, pumps, etc. These fasteners can withstand the forces and vibrations generated during mechanical operation and ensure the normal operation of mechanical equipment.
Electronic equipment fastening: In the electronics industry, fasteners are used to secure circuit boards, heat sinks, casings and other components. They help ensure the structural integrity of electronic equipment and prevent damage caused by vibration or shock.
Maintenance and Repair: The removable nature of fasteners makes them very useful in the maintenance and repair of equipment. Fasteners can be easily removed and reinstalled when parts need to be replaced or for periodic inspection.
Resistance to corrosion and environmental effects: Many fasteners undergo special treatments, such as galvanizing, nickel plating, or using stainless steel materials, to improve their corrosion resistance. This enables their use in harsh environmental conditions such as marine, chemical industry or outdoor applications.
Adjustment and Positioning: Fasteners can be used to adjust and position components to ensure precise fit and operation. For example, using adjustable screws allows you to fine-tune the position of the equipment to meet specific job requirements.
Safety: Fasteners play an important role in ensuring the safety of equipment and structures. They prevent parts from loosening or falling off, thereby avoiding potential safety incidents.
Economical: The mass production and widespread availability of standard fasteners reduces costs, making them an affordable joining solution. Additionally, their reusability also helps reduce waste.
Easy to use: Many fasteners are designed to simplify the installation process, such as self-tapping screws, self-locking nuts, etc. These designs reduce installation time and improve production efficiency.

Standard fasteners go far beyond their basic functions, they are an integral part of modern industry and daily life. With the advancement of technology, the application range and functions of fasteners are constantly expanding and enhancing.

What is the fatigue life of standard fasteners and what factors is it related to?

The fatigue life of a standard fastener refers to the number of cycles the fastener can withstand under repeated loading and unloading conditions until fatigue fracture occurs. This concept is very important in engineering because it is directly related to the reliability and safety of fasteners and even the entire structure.

Fatigue life is related to multiple factors, including but not limited to:

Material Properties: The material of a fastener has a significant impact on its fatigue life. Different materials have different strength, toughness and fatigue resistance properties. For example, high-strength steels generally have better fatigue strength.
Fastener geometry and size: The size and shape of a fastener also affects its fatigue life. For example, larger diameter bolts may have a longer fatigue life because their larger cross-sectional area allows them to withstand greater cyclic stresses.
Surface treatment: The surface quality of a fastener is critical to its fatigue life. Rough surfaces increase stress concentrations, thereby shortening fatigue life. Common surface treatment methods include heat treatment, surface hardening, plating (such as zinc plating, chromium plating), etc. These treatments can improve surface smoothness and reduce stress concentration.
Stress concentration: The threaded part of a fastener is a common area of stress concentration. The stress here is much higher than the average stress, which can easily lead to the generation and expansion of fatigue cracks.
Working load: The cyclic load on a fastener directly affects its fatigue life. The greater the load, the fewer cycles it takes to reach fatigue fracture.
Working conditions: The environmental conditions in which fasteners are located, such as temperature, humidity, chemical media, etc., will also affect their fatigue life. For example, in corrosive environments, the fatigue life of fasteners may be reduced.
Preloading force: The preloading force of a fastener also affects its fatigue life. Appropriate preload can increase the stiffness of the connection and reduce fatigue damage caused by vibration.
Installation and use methods: The installation method of fasteners (such as whether they are aligned, tightening methods, etc.) and the maintenance during use will also affect their fatigue life.
Manufacturing quality of fasteners: Defects in the manufacturing process, such as material inclusions, surface cracks, etc., may lead to reduced fatigue life.

To accurately predict and improve fastener fatigue life, detailed engineering analysis and testing is often required. During the design phase, engineers use various calculation methods and empirical formulas to estimate the fatigue life of fasteners and select appropriate materials and designs based on the needs of the actual application.