Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 8G4021 found under Arm Assembly Lift Blade by Caterpillar Inc. The National Stock Number assigned to this part is 2590014310836, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 8G4021.