Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KS 42120 found under Gear Helical by Wartsila Diesel Inc. The National Stock Number assigned to this part is 3020014459628, 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 KS 42120.