Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MXL664 PIECE 665 found under Bearing Sleeve by Aai Corporation. The National Stock Number assigned to this part is 3120012425839, 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 MXL664 PIECE 665.