Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 13 49 35R6312B found under Crystal Unit Quartz by Vectron International Inc. The National Stock Number assigned to this part is 5955004899978, and the Federal Supply Class is 5955 Oscillators And Piezoelectric Crystals. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 13 49 35R6312B.