Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 649-393-156-0 found under O Ring by Snecma Moteurs Groupe Snecma. The National Stock Number assigned to this part is 5331001668401, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 649-393-156-0.