Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 991 191 00 found under Washer Spring Tension by Amperex Electronic Corp. The National Stock Number assigned to this part is 5310012997630, 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 991 191 00.