Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31239 found under Gear Spur by Bell And Howell Phillipsburg Co. The National Stock Number assigned to this part is 3020009376053, 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 31239.