Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HSM 411.2 POS. ITEM 6 found under Ball Bearing by Whitaker Brothers Business Machines. The National Stock Number assigned to this part is 3110016103955, 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 HSM 411.2 POS. ITEM 6.