Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 04021 350K found under Electron Tube by Thales Training And Simulation Ltd. The National Stock Number assigned to this part is 5960015534243, 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 04021 350K.