Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MCM432-1B found under Oscillating Group by Q Tech Corp. The National Stock Number assigned to this part is 5955010725535, 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 MCM432-1B.