1) Heavy Hex Nut 2) Manufacturer Directly 3) Grade 2H 4) Available ... DIN933,DIN6914,ASTM A325M,ASTMA325, ASTM A-10,ASTM490M and other you would like to Grade4.8,6.8, ... 8.8,10.9,12.9 and others you needMaterial 45#, 40Cr, 35CrMoA, 42CrMoA, 25Cr2MoVA, ... , 40CrNiMo,Stainless steel and so onSizeM6-M42 LengthM16-300Type of headSquare,Hex,Flange,Hex socket,T-Head and other you can chooseSurface ...