Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5-227 ITEM 4 5-39MIL1-0803 found under Bearing Washer Thrust by Duragear Ltd. The National Stock Number assigned to this part is 3120013490778, 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 5-227 ITEM 4 5-39MIL1-0803.