Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W3943B found under Gear Rack by American Hoist And Derrick Co. The National Stock Number assigned to this part is 3020008396471, 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 W3943B.