Security Door Controls


SDC: The Benchmark for Access Control and Life-Safety Solutions


Security Supply is your premier authorized source for Security Door Controls (SDC), a global leader in the development and manufacturing of mechanical door hardware, electronic locking devices, and comprehensive access control systems. Since 1972, SDC has been at the forefront of the electronic security and architectural openings industry, providing patented solutions that bridge the gap between high-security requirements and stringent fire life-safety codes.

A Legacy of Innovation and Life Safety

Founded by industry pioneer Arthur V. Geringer, D.A.H.C., SDC holds scores of patents and trademarks that have defined the modern locking industry. Their story began with a commitment to solving the "stairwell paradox"—the need to keep high-rise buildings secure from intruders while ensuring occupants can safely exit during an emergency.

Today, SDC products are assembled in the United States and found in the world’s most secure facilities, including:

  • checkHigh-Rise Structures: Dominating city skylines from New York to Los Angeles.
  • checkCritical Infrastructure: Nuclear power plants, government centers, and military bases.
  • checkTransportation Hubs: Major international airports including JFK, O'Hare, and Dallas/Fort Worth.
  • checkCultural & Educational Institutions: Prestigious museums like the Getty and MoMA, as well as leading universities and laboratories.
Security Control Panel


High-Performance Solutions Available Through Security Supply


As an authorized distributor, Security Supply provides professional integrators and locksmiths with direct access to SDC’s extensive catalog. SDC’s locking systems are engineered for applications where fail-safe reliability is non-negotiable.


  • checkElectronic Locking Devices: Featuring the legendary HiTower® series and high-security mortise locksets.
  • checkAccess Controls & Exit Devices: Designed to integrate seamlessly with modern security systems.
  • checkShipQuick Program: To meet demanding project timelines, SDC utilizes a lean manufacturing system and their "ShipQuick" program, ensuring that critical hardware is available when you need it most.





The Security Supply Advantage

By choosing Security Supply as your SDC partner, you benefit from more than just world-class hardware. We back every SDC product with the technical expertise and inventory reliability your business depends on.

Reliability & Expertise: Security Supply assists systems integrators and contract hardware distributors in selecting the precise SDC components required for code compliance and maximum security.

The Benchmark for Access Control and Life-Safety Solutions

Whether you are retrofitting a commercial office space or securing a high-traffic industrial facility, SDC’s commitment to quality and innovation—paired with the logistical support of Security Supply—ensures your project is built to last.

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