Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 063 000 139 found under Bearing Sleeve by Waukesha Bearings Corporation. The National Stock Number assigned to this part is 3120012294802, 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 063 000 139.