A septum magnet, used to separate a pion beam from a high intensity proton beam, has been designed, built and tested at TRIUMF. Because the proton beam intensities car exceed 100 μA, and it is anticipated that ∼ 1% of the beam will be spilt on the septum magnet, all components of the magnet have to be radiation hard (i.e., inorganic). To achieve this, the conductors are insulated from each other using metallized ceramic insulators. Because of the complex shapes of the conductors and the large numbers of insulators required, it was necessary to jig braze all of the insulators simultaneously in a vacuum furnace. Results of internal and leakage field calculations and measurements are also presented and discussed.