Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 30X2 5B-DIN3770-NB70 found under O Ring by Din Deutsches Institut Fuer Norm. The National Stock Number assigned to this part is 5331121643690, 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 30X2 5B-DIN3770-NB70.