Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NAS74A4-006 found under Bearing Sleeve by M F Services Inc. The National Stock Number assigned to this part is 3120002879734, 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 NAS74A4-006.