Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X55-600-N4-1-SM found under Transducer Motional Pickup by Ronan Engineering Company. The National Stock Number assigned to this part is 6695014946515, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like X55-600-N4-1-SM.