50 7/16-14 NYLOCK HEX NUTS 18-8 STAINLESS STEEL, USE IN MARINE, AUTO, TRUCKS, BUSES, AIRPLANES, MOBIL HOMES, MACHINERY, FOOD PROCESSING EQUIPMENT, ETC. THEY COME WITH A NYLON INSERT IN THE NUT AND IT LOCKS ONTO THE THREADS SO THE NUT DOESN'T LOOSEN UP AND COME OFF. YOU DO NOT NEED A LOCK WASHER WITH THESE NUTS, UNLESS YOU REALLY WANT TO
