Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 210 0 016 REV ITEM NO 4 found under Retainer Roller Bearing by Maritime Applied Physics Corporation. The National Stock Number assigned to this part is 3110016055037, and the Federal Supply Class is 3110 Bearings Antifriction Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 210 0 016 REV ITEM NO 4.