Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 84J1603 found under Bearing Unit Sleeve by Pioneer Motor Bearing Co. The National Stock Number assigned to this part is 3120001759534, 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 84J1603.