Bolt A4-70 is made of 316 stainless steel material.
A4 is a type of 316 stainless steel material, and the "70" after it refers to the tensile strength performance grade of stainless steel.
SUS316(0Cr18Ni12Mo2)、SUS316L(00Cr17Ni14Mo2)， That is to say, A4 is mainly used for the manufacturing of high corrosion resistant stainless steel bolts, screws, washers, and nuts. The strength grade of bolts is generally 70, but it can also reach a high strength grade of 80.
Stainless steel bolts: The strength grade mark of stainless steel is separated by a "-" middle bar, with the left indicating the material and the right indicating the tensile strength, for example: A2-70 and A4-70;
In some fastener industries, 302HQ and 304 are abbreviated as A2; 316 and 316L (stainless steel bolts with carbon C content less than 0.03% can be marked with "L") are referred to as A4.
The grades of stainless steel bolts are divided into 45, 50, 60, 70, and 80. The materials are mainly austenitic A1, A2, and A4, martensitic and ferritic C1, C2, and C4, represented by A2-70, with "--" indicating the bolt material and strength grade respectively.
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