... 2H Heavy Hex nut Dia: 1/4" - 2 1/2" Standard: ASTM A194,2H, ASTM A563 Finish: Plain, ZP, Black, HDG ... . D. G Our factory specialize in producing standard hex Nuts, slotted hex Nuts, square Nuts, special Nuts and kinds of Bolts. We produce the ANSI ... , DIN, ISO, BS and JIS Nuts and Bolts. Such as ASTM A194-2H, 2HM, ASTM A193 ...