Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ACO-20.000MHZ found under Oscillator Crystal Controlled by Datametrics Corporation. The National Stock Number assigned to this part is 5955013969795, 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 ACO-20.000MHZ.