M6 Hex Nut - A2 Grade A2 stainless steel has good resistance to corrosion except in severe industrial and Marine Condition. Use A4 in a marine environment. Where: e = point to point m = thickness s = across flats d = Thread e - 11.05 mm (min) m - 4.7 mm (min) s - 10 d - M6 Thread Pitch - 1.0 mm DIN934