A hammer union seal assembly (10), hammer union seal (12) and method of construction thereof is provided. The method of constructing the hammer union seal (12) includes forming an annular rubber ring (24) having a cylindrical inner surface and a cylindrical outer surface, with the cylindrical outer surface extending between opposite corner edges. The method further includes forming an annular steel ring (28). Then, recessing and bonding the annular steel ring (28) in one of the corner edges with an outer surface of the steel ring remaining exposed.
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