Part Number MS21042-4 Nut Self Locking Hexagon Alloy Ste in stock with ready to ship. Get an instant quote for Honeywell Aerospatiale Inc part number MS21042-4 by filling form below with your desired order quantity, targeted price and the expected order-fulfilment date. Get instant quote for MS21042-4. Our dedicated account manager will get back to you within 15 minutes.