Since 1969, H-J has been providing quality parts for transformer, switchgear, and breaker manufacturers, as well as most companies involved with transmission and distribution equipment. H-J started out with a small foundry and machine shop outside of Saint Louis, Missouri, and has grown into an international company with over 350,000 square feet of manufacturing space.

H-J operates its own epoxy molded components operation, non-ferrous foundry, electrical porcelain assembly plants, tin and silver-plating lines, and world-class high voltage test lab.