Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4820-45SH1200 found under Gear Spur by Smallwood And Son Machine Co. The National Stock Number assigned to this part is 3020001554315, 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 4820-45SH1200.