Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1211K found under Bearing Ball Annular by Bethlehem Steel Corp. The National Stock Number assigned to this part is 3110001091842, 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 1211K.