Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PX 11581 A found under Propeller Shaft Non by Twin Disc Incorporated. The National Stock Number assigned to this part is 3040015962047, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PX 11581 A.