1.Material:Carbon steel Q195 Q235 35K #45

Stainless Steel 304 316 200

2.Finish: blue and white zinc, yellow zinc, black, HDG

3.Grade: class4.8 class5.8 class6.8 class8.8 class10.9

grade2 grade5 grade8

4.Standard: DIN933 DIN931

  ANSI B18.2.1

GB5780 GB5781 GB5782