Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4016 1.250IN BORE found under Coupling Shaft Rigi by Martin Sprocket And Gear Inc. The National Stock Number assigned to this part is 3010015936056, 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 4016 1.250IN BORE.