1.ASTM A194 2H BlackHex Nut 2.We are manufacturer 3.Standard:ASTM A194 2H/2HM 4.Materials: Carbon , Iron ASTM A194 2H Black Hex Nut Bolts: Hex Bolts, Heavy Hex Bolts, Hex Cap Screws , Stud Bolts, Full Thread Rods, etc.Nuts: Hex Nuts, Heavy Hex Nuts, Square Nuts, etc.Washers: Flate Washers, Ball Washers, etc. Specifications:1.Main Size: 1/2"~4" ; 2.Standard: ASTM A194 2H; 3.Material:Carbon steel , ...