Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W55-1 3-4INB0RE found under Flange Shaft by Watson H S Co. The National Stock Number assigned to this part is 2010009222803, and the Federal Supply Class is 2010 Ship And Boat Propulsion Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like W55-1 3-4INB0RE.