Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JT 7 20X1 90 31B6 found under O Ring by Societe Technique Armoricaine. The National Stock Number assigned to this part is 5331143560987, 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 7 20X1 90 31B6.