Metal-rubber seals are a combination of metal and rubber mechanically and/or chemically bonded together.  The metal is machined or stamped to become an integral part of the application assembly.  The rubber is then bonded either to the edge of the metal, in machined grooves, across metal surfaces or in any combination of the above. 

Fastener seals are edge-bonded metal and rubber seals designed to fit standard bolts and nuts.  The metal-rubber bond is application dependent and can either be mechanical (coin and spline method) or chemical (edge bond method).  The rubber profile is also application dependent and has a wide range of configurations (rounded, triangular, self centering, etc.).  Fastener seals are designed to seal directly under bolt heads or along the threads of the fastener.