Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SS4019-1E found under Seal Assy Engine Ai by Sikorsky Aircraft Corporation. The National Stock Number assigned to this part is 1560005697598, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SS4019-1E.