Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S311 found under Bearing Ball Annular by Gary Steel Products Corp. The National Stock Number assigned to this part is 3110001564852, 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 S311.