uxcell M3x6mm Thread Button Head Hex Socket Cap
The performance grades of hexagon socket screw 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, among which screw of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched, tempering), commonly known as high-strength screw, and the rest are ...
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