Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17994 found under Transmission Mechan by Twin Disc Incorporated. The National Stock Number assigned to this part is 2520003372144, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 17994.