Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 474 561 found under Gear Worm Wheel by Leica Inc. The National Stock Number assigned to this part is 3020013721910, 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 474 561.