Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XL10004-11AS6 found under Crystal Unit Quartz by Telephone Systems Communications. The National Stock Number assigned to this part is 5955009363591, 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 XL10004-11AS6.