M6 Hex Nut - A4 Grade - Left Hand Thread Threads are left hand and these nuts tighten anti clockwise, the opposite way to standard nuts, they do not fit standard bolt 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 1.00 e 11.05 m 4.7 s 10 d M6 DIN934