Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K680 50 25M found under Oscillator Crystal by Kyocera Intl Inc. The National Stock Number assigned to this part is 5955013809891, 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 K680 50 25M.