Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number QA18A6671K11 found under Crystal Unit Quartz by Safran. The National Stock Number assigned to this part is 5955142753903, 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 QA18A6671K11.