Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BS8ATH21 found under Bearing Plain Self Aligning by Timken Company The. The National Stock Number assigned to this part is 3120005285336, 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 BS8ATH21.