Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PS100FBS 2.250 IN. BORE found under Coupling Shaft Flex by Reliance Electric Co. The National Stock Number assigned to this part is 3010014256820, and the Federal Supply Class is 3010 Torque Converters And Speed Changers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PS100FBS 2.250 IN. BORE.