Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 277-20 found under Power Takeoff Transmission by Parker Hannifin Corporation. The National Stock Number assigned to this part is 2520014802088, 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 277-20.