Who We Are

TRI-M-CO is a sheet metal fabrication contractor. Based in San Marcos, California, we specialize in sheet metal fabrication, machining, paint, silkscreen, welding and assembly. We provide solid models from all major computer-aided design and computer-aided manufacturing systems for assemblies of product such as pro-E, solid works, solid edge, solid designer, sheet adviser and catia, to name a few. The company deals with chassis, front panels, enclosure and tooling products.


Our History

TRI-M-CO is a San Diego based, family owned and operated business established in 1961 by Richard Sr. and Jackie Martin. TRI-M-CO has grown over the years from a small shop in Escondido to the industrial estate that we currently operate, in San Marcos.
Years of growth and expansion have not changed our commitment to personal attention.Our objective is to obtain your business and earn your trust, then to work hard to develop a lasting relationship.