Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KKK-T-631D found under Tractor Full Tracke by Federal Specifications. The National Stock Number assigned to this part is 2410010690707, and the Federal Supply Class is 2410 Tractor Full Tracked Low Speed. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like KKK-T-631D.