Hexagon socket bolts with cylindrical head are classified according to the hardness of the screw wire, tensile force, yield strength, etc., that is, the grade of hexagon socket bolts with cylindrical head, and what grade is the hexagon socket bolt with cylindrical head. Different product materials require different grades of cylindrical head socket head bolts corresponding to them. jingbang can customize cylindrical head hexagon socket head bolts for various needs of customers
Cylindrical socket head bolts are divided into ordinary and high-strength according to grade strength. Ordinary cylindrical head socket head bolts refer to grade 4.8, and high-strength cylindrical head socket head bolts refer to grades above 8.8, including grades 10.9 and 12.9. 12.9 grade cylindrical head hexagon socket bolts generally refer to those with knurling
The performance grades of cylindrical head socket head bolts for steel structure connection are divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc., of which grade 8.8 and above are collectively called high-strength bolts, and the bolt material is Low carbon alloy steel or medium carbon steel and heat treatment, the rest are commonly known as ordinary bolts. The bolt performance grade label consists of two parts of numbers, which respectively represent the nominal tensile strength value and yield strength ratio of the bolt material.