Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4W 1.625 IN. BORE found under Coupling Shaft Flexible by Reliance Electric Company. The National Stock Number assigned to this part is 3010014378065, 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 4W 1.625 IN. BORE.