1.High Tensile Socket Head cap screws 2.Quality: 12.9 2.Surface: Galvanized,Black oxide 3.Material:ML40Cr ... 4.CET:TS16949:2009 Hexagon Socket Head Cap ScrewsSpecification:1. Quality:10.9;12.92. Surface: Phosphated,Galvanized,Black oxide,Dacromet ... ,DIN7991,ISO7380,DIN933,DIN931,ISO7379.Packing:Workshop:Laboratory:Exhibition:Training: High Tensile Socket Head cap screws