A bonding device electrically bonds metallic surfaces through serrated metal teeth which embed into each metal surface as a fastener is tightened. A sealing material circumferentially outward and inward from the teeth create an air-tight and water-tight seal around the teeth, protecting the bonding location. The device can have an extended central collar extending axially from the through-hole in the center of the device, which will allow it to be installed in holes, or on a stud without the use of adhesives or other retaining methods.