Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2638539-2 found under Gear Antibacklash Spur by Lct Electronics. The National Stock Number assigned to this part is 3020004357950, 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 2638539-2.