Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A9257 found under Washer Spring Tensi by Emerson Electric Co. The National Stock Number assigned to this part is 5310002118241, 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 A9257.