Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H31-04 found under Nut Self Locking He by Satair A S. The National Stock Number assigned to this part is 5310007272501, 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 H31-04.