Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C21165G1 found under Gear Assembly Spur by Litton Systems Inc. The National Stock Number assigned to this part is 3020012644671, and the Federal Supply Class is 3020 Gear Pulley Sprocket And Transmission Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like C21165G1.