Fasteners refer to the general term for the types of mechanical parts used when two or more parts (or components) are fixed and connected into a whole, and self-clinching fasteners are one of them. The function of the fastener is to fasten the connection, and its application range is very wide. Because no matter in various machinery, equipment, vehicles or various supplies, you can see all kinds of fasteners.
There are many varieties and specifications of fasteners. Of course, they differ in performance and purpose, but there are also many. The most important thing is its standardization, serialization and generalization. Therefore, some people refer to standard fasteners as standard parts.
Fasteners are the most widely used mechanical basic objects, and the inspection and distribution methods are also different. Of course, the most important thing is quality control. After all, quality is the most important criterion to measure whether an object is qualified. Then, the first thing related to quality is appearance, size, impact test, forging streamline; the appearance after heat treatment, hardness, torque, tension and gold content are higher. Heat treatment involves more appearance, hardness, torque, tensile force, metallography, etc. Surface treatment involves more hydrogen embrittlement testing, electroplating, salt spray, etc., including testing of harmful substances during transportation.
It usually includes the following 13 types of parts: bolts, studs, screws, nuts, self-tapping screws, wood screws, washers, retaining rings, pins, rivets, components and connection pairs, welding nails, wire thread inserts.
However, all parts of the fasteners should still comply with national standards.