Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8251-013 found under Nut Self Locking Ca by Safran. The National Stock Number assigned to this part is 5310145204970, 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 8251-013.