... Standard:ISO,DIN,ASME,etc Grade 4.6 Bolt And Nut sizeM3-M76Faceplain,zinc plated,black oxide,hot ... 5.8,6.8, 8.8, 10.9 and 12.9standardDIN ,ANSI/ASME,BS,GB,JIS,etcpackingin wooded ... ,value.pump,thermal exchange,condensing tower,plain hole and man hole of flange ,etcSpecial design available as ... kinds of bolts and nutsPacking---In wooden cases or according to customers' requirements . Grade 4.6 Bolt And Nut