Abstract: A robust, easy to mount probe sensor includes an elongated body enclosing a sensor element and an integral flange extending away from the body. The body and flange are formed of material having a relatively low characteristic yield point. First and second generally parallel closely spaced through passages extend through the flange. An insert formed of material having a relatively high characteristic yield point is disposed in one of the passages. A fastener including a shank portion which extends through the other passageway includes an enlarged head which overlays the insert containing passageway and engages an attachment structure to effect directed compressive loading of the probe sensor flange.