Standard:din933 asme b 18.2.1 gb5783 Size:m1.6-m48 no4-1-1/2 Material:carbon steel, alloy steel, stainless steel 304/316/201 Grade:class 4.8/5.8, class 8.8, class 10.9 Surface treatment:zinc plated blue/white, zinc plated yellow, hot dipped galvanized, plain