Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11139AA found under Gear Spur by Bell And Howell Phillipsburg Co. The National Stock Number assigned to this part is 3020003095735, 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 11139AA.