1.ASTM A194 2H/2HM Heavy Hex Nuts 2.Standard:ASTM A194 2H 3.Materials: Carbon steel and Alloy Steel Heavy Hex Nuts ASTM A194 2H Specifications:1.Main Size: 1/2"~4",M12~M100 ; 2.Standard: ASTM A194 2H/2HM; 3.Material:Carbon steel or alloy steel;4.Surface finishes: plain, black oxygenation,black phosphated,zinc-plated,etc. ;5.Usage: steel structures,such as multi-floor&high-rise steel structure ...