A fastener is a general term for a type of mechanical part used to fasten two or more parts (or members) together as a whole. Fasteners are a kind of mechanical parts used for fastening connection and widely used.　

Russia's northern steel and Hardware Co. also asked for a safeguard investigation into Chinese exports of fasteners. If after the EU, Russia again lifted the anti-dumping stick　

Fasteners are widely used in mechanical foundation, with a wide variety of industry characteristics, market demand, it is widely used in machinery, electric, automobile, transportation, aerospace and other areas of the national economy.　

At present, the specification and type of steel connecting sleeve have already stepped into the construction site of numerous projects, and have played an important role?　

In recent years, the rapid development of our metallurgical, mechanical, electronic, automotive and construction industries, as well as the continuous progress of our industry, has driven the demand and production of fasteners.　

The zinc alloy die-casting surface has the pattern, and has the metal flow trace production reason: 1, leads to the casting entrance place runner too shallow.　

High strength bolts are mainly used in steel structure engineering. High strength bolt is a very important feature, only for single use, generally used for permanent connection, no use!　

High-strength screws are the foundation of general-purpose and are made of steel, stainless steel, titanium alloy and Non-ferrous metal. Bolts are most commonly used in high-strength screws. The mechanical properties of bolts largely depend on the quality of the materials used to make high-strength screws.　

High strength bolts are made of high strength materials. The screws, nuts and washers of high-strength bolts are made of high-strength steel, commonly used 45 steel, 40 boron steel, 20 manganese titanium boron steel. General bolts are usually made of Q235 steel.　

1. The steel structure torsion shear bolt is different from the common bolt. Torsion shear bolts in steel structures are usually used for permanent connections. Commonly used M16-M30. The torsional shear bolt of very large size steel structure is unstable and should be used with caution.