Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FR15 145 found under Holder Vacuum Tube by Lucas Aerospace Power Equipment. The National Stock Number assigned to this part is 5960003191799, 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 FR15 145.