Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 979CPC40 found under Sprocket Wheel by The Electric Tachometer Corp. The National Stock Number assigned to this part is 3020004683170, 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 979CPC40.