Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4B216B found under Bearing Knuckle by Gse Spares Inc. The National Stock Number assigned to this part is 3110008438527, 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 4B216B.