Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JT 18 40X2 70 21B6 found under O Ring by Societe Technique Armoricaine. The National Stock Number assigned to this part is 5331142653874, 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 JT 18 40X2 70 21B6.