Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 44B3021-439B found under Bearing Washer Thrust by Carrier Corporation. The National Stock Number assigned to this part is 3120008390297, 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 44B3021-439B.