Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R1003 found under Pulley Groove by United States Postal Service. The National Stock Number assigned to this part is 3020004059084, 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 R1003.