Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 90-5010-00012 found under Gear Spur by Cincinnati Gear Co The. The National Stock Number assigned to this part is 3020013841053, 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 90-5010-00012.