High-Strength Friction Grip Bolt

High strength bolts are made of high-quality alloy structural steel of grade 10.9S or 8.8S and undergo heat treatment. High strength bolt holes should be drilled into holes. The aperture of high-strength bolts connected by friction type is 1.5-2.0mm larger than the nominal diameter d of the bolt; The aperture of high-strength bolts for pressure bearing connections is 1.0-1.5mm larger than the nominal diameter d of the bolts.

For this high-strength bolt, grade 8.8 corresponds to grade 8 nuts, and grade 10.9 corresponds to grade 10 nuts. Many people ask why the hardness of nuts is lower than that of screws? There is a reason for this. During use, in order to protect high-strength bolts and extend their service life, there will definitely be some wear and tear during continuous disassembly. When the hardness of grade 8 nuts is relatively low, it can effectively protect the screws. In terms of the cost of using such fasteners, this combination is relatively reasonable, Just like when compared to the hardness of a wrench, the hardness of the wrench is the highest.

It can be said that there is a very high level of production for high-strength bolts. Nowadays, high-strength bolts are widely used in industry and the automotive industry, and the production technology requirements for such screws are also increasing.