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» Bolts Fasteners

ボルトファスナー

Bolts are also known as industrial bolts, micro bolts used in DVDs, cameras, glasses, clocks, electronics, 等 .; general bolts for TVs, electrical products, musical instruments, furniture, 等 .; for engineering, 建設, coaxial use large bolts The ordinary bolts of the cap can be divided into three grades of A, B and C according to the manufacturing accuracy. The grades A and B are refined bolts and the grade C is rough bolts. For connecting bolts of steel structure, unless otherwise specified, they are generally ordinary coarse grade C bolts. There are differences in the processing methods of different levels, and the corresponding processing methods are generally as follows: The bolt rods of A and B bolts are processed and formed by a lathe. The surface is smooth and the dimensions are accurate. The material performance level is 8.8. ; Grade C bolts are made of unprocessed round steel, the size is not accurate enough, and the material performance grade is grade 4.6 or grade 4.8. The deformation is large during the shear connection, but it is easy to install and the production cost is low. It is mostly used for temporary connection during tensile connection or installation.
The bolts are divided into eight grades of 3.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, そして 12.9 according to the performance grade, of which the grade 8.8 (including grade 8.8) bolts are made of low carbon alloy steel or medium carbon steel and are heat treated + 焼戻し), commonly known as high-strength bolts, below 8.8 (excluding 8.8) are commonly known as ordinary bolts.