M5 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 Thread Pitch - 0.8 mm e - 8.79 mm (min) m - 3.7 mm (min) s - 8 d - M5 DIN934