Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CB71-42073 ITEM 3 found under Roller Hoist by David Round Company The. The National Stock Number assigned to this part is 3120012712014, 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 CB71-42073 ITEM 3.