Thread specification d(8g): m8*20, m8*25, m8*30, m8*35, m8*40, m8*45, m8*50 and m8*55.
M8 national standard silk attack?
Round handle x square handle 6.3X5.0
Japanese standard tapping round shank x square shank 6.2X5.0
Bottom hole: 6.8
M8 bolt, selling bolts, screws and nuts Yu Wenlong thinks M8 bolt, 8 means the thread size is 8 mm ... M8 chemical anchor is a specification of chemical anchor, which refers to the chemical anchor with a screw diameter of 8mm. The tensile strength of chemical anchor varies greatly according to the product quality of different manufacturers.
Extended data:
According to the thread tooth type, it can be divided into coarse tooth and fine tooth, and the coarse tooth type is not displayed in the bolt mark. Bolts are divided into eight grades according to performance grades: 3.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9. Among them, the bolts above grade 8.8 (including grade 8.8) are made of low-carbon alloy steel or medium-carbon steel, and after heat treatment (quenching+tempering), commonly known as high-strength bolts, 8.8.
According to the manufacturing accuracy, ordinary bolts can be divided into three grades: A, B and C. Grade A and B are fine bolts and grade C is thick bolts. Unless otherwise specified, the connecting bolts of steel structures are generally ordinary thick C-grade bolts. Different processing methods are different, and usually the corresponding processing methods are as follows:
(1) The bolt shank of Grade A and B bolts is machined by lathe, with smooth surface and accurate size, and its material performance grade is 8.8, which is complicated to manufacture and install, expensive and rarely used.
② Grade C bolts are made of unprocessed round steel, and the size is not accurate enough. The material performance grade is 4.6 or 4.8. The shear connection has large deformation, but the installation is convenient and the production cost is low. It is mostly used for tension connection or temporary fixation during installation.
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