Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4919B found under Bearing Sleeve by Marysville Marine Distributors Inc. The National Stock Number assigned to this part is 3120008656928, 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 4919B.