Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 257 0158 00 found under Electron Tube by Rockwell Collins Inc. The National Stock Number assigned to this part is 5960008000555, 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 257 0158 00.