Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PR3407-1PIECE 99 found under Bearing Sleeve by The Electric Tachometer Corp. The National Stock Number assigned to this part is 3120012686898, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PR3407-1PIECE 99.