Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5SMF5209M found under Nut Self Locking Pl by Messier Bugatti Dowty. The National Stock Number assigned to this part is 5310143502850, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5SMF5209M.