M8 Hex Nut - A4 Grade A4 grade stainless steel has a greater corrosion resistance than A2 in certain environments. It is often used for Marine applications especially when coming into direct contact with salt water Where: e = point to point m = thickness s = across flats d = Thread Thread Pitch - 1.25 mm e - 14.38 mm (min) m - 6.14 mm (min) s - 13 d - M8 DIN934