Part Number 503 4 04028 002 having (CAGE Code K2523) and FSC 5310 Nuts and Washers in stock with ready to ship. Get an instant quote for 503 4 04028 002 Nut Self Locking Hexagon by Eaton Aerospace Llc. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.