Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XA0040 found under Holder by Microlab Fxr. The National Stock Number assigned to this part is 5960009088658, and the Federal Supply Class is 5960 Electron Tubes And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like XA0040.