Special Metal Fasten The Industry Standard
Special metal fasteners are a kind of mechanical parts which are tightly connected and widely used. Fasteners, industry widely used, including energy, electronics, electrical appliances, machinery, chemical industry, metallurgy, mold, hydraulic, and so on, in all kinds of machinery, equipment, vehicles, ships, railways, Bridges, buildings, structures, tools, instruments, chemical industry, instrument and apparatus, such as the above, you can see all kinds of fasteners, is the most widely used mechanical components. It is characterized by a wide variety of specifications, different performance USES, and a high degree of standardization, serialization and generalization. As a result, some of the fasteners that already have national standards are called standard fasteners, or standard ones for short.
Commonly used testing instrument
The most important part of the development and design of the fasteners of special metal fasteners is quality control. There are several major passes from incoming materials to finished products, which have different inspection methods. The first feed is related to appearance, size, element, performance, hazardous material detection, etc. The process aspect is more appearance, size, percussion experiment, forging streamline; Heat treatment is more about appearance, hardness, torque, pull, gold, etc. Surface treatment is more of some hydrogen embrittlement test, coating, salt mist and so on, including shipment has a harmful material detection.
The industry standard
The national standard
1. Standard of product dimension of special metal fastener fasteners: specify the basic dimensions of products; Threaded products include the basic dimensions of the thread, the end of the thread, the shoulder pitch, the back of the knife slot, the end dimensions of the outer thread parts, etc.
2. Standard for technical conditions of fastener products. It mainly includes product tolerances, mechanical properties, surface defects, surface treatment, product testing standards and relevant specific provisions.
3, screw product acceptance check, marks and packing standard: specific provision of qualified products factory acceptance sampling project quality and sampling plan, method and product logo and packaging requirements.
4. Standard parts, fasteners, screws, screws, and screws, the standard of marking methods: specify the product's complete marking method and simplify the content of the method of marking.
5. Other standards of fasteners: standards for fastener terminology, standards for fastener products, etc.