Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A3918A found under Cup Tapered Roller Bearing by Metadure Parts And Sales Inc. The National Stock Number assigned to this part is 3110013075812, 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 A3918A.