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What is the difference between hexagon socket head cap screws grade 12.9 and grade 10.9

The performance grade of bolts for steel structure connection is 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. Among them, the 8.8 grade and above bolts are made of low carbon alloy steel or medium carbon steel and are heat treated (quenched and tempered), commonly known as high strength bolts, and the rest are commonly known as ordinary bolts. The bolt performance grade label consists of two parts, which respectively represent the nominal tensile strength value and yield ratio of the bolt material. For example, a bolt with a performance grade of 4.6 means: 1. The nominal tensile strength of the bolt material reaches 400MPa; 2. Bolt

2018-04-17