SECURITY DOOR CONTROLS manufactures electrified access control hardware and controllers worldwide. Since 1972 SDC products have been designed, engineered and built in America while most of our larger competitors manufacture overseas. SDC is the bridge from mechanical access control to electrified security systems. SDC offers premium, code-compliant products to allow users a seamless transition into electronic access control. With a robust toolbox of over 35,000 access and egress control components, SDC products form turnkey solutions to address almost any door opening imagined.