Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 40BFB9 found under Sprocket Wheel by Whitney Chain Operation Power. The National Stock Number assigned to this part is 3020001060385, 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 40BFB9.