Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 39A5634 found under Retainer Crystal Ho by A R F Products Inc. The National Stock Number assigned to this part is 5955005029963, 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 39A5634.