Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 55SD23 found under Bearing Roller Self Aligning by Anti Friction Bearing Mfg. The National Stock Number assigned to this part is 3110001561426, 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 55SD23.