Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31213-ZW1-004 found under Gear Set Spur Matched by Slidell Marine Inc. The National Stock Number assigned to this part is 3020015089320, 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 31213-ZW1-004.