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Sag Harbor Industries is a contract manufacturer of custom electronic assemblies. Products manufactured in the Sag Harbor, NY and Farmsville, NC facilities include motor windings, solenoids, stators, voice coils for headsets and printed circuit board assemblies. Satellite communication gear and Medical sub-assemblies are also produced in a controlled environment. In 1989, Sag Harbor began producing electromagnetic locks for Dortronics Systems. Dortronics Systems was purchased and became a wholly owned subsidiary of Sag Harbor Industries in 1990. Dortronics Systems operates out of the Sag Harbor Industries facility on Long Island and manufactures electric locking hardware and controls for the Security, Hardware, and Door control industries.

Visit to learn more or call us at 800-906-0137.

Access & Security Solutions
Multi-door Interlocks - Annunciators - Switch Controls - Mag Locks and Strikes.
Discussion of Access Control Locking Hardware
Access control systems are used to limit entry into designated secure areas to certain personnel during predetermined time periods. In this one-hour AIA and BICSI accredited course we will review electrified door locking hardware and related components which interface with electronic access controllers to provide a complete security solution.
Door Interlocks: Applications and System Design
In this one-hour AIA and BICSI accredited course we will review the various types of door interlocks, man traps, sally ports and their applications. We will define and discuss the appropriate use of each type and their configuration to meet the intended design criteria.
Dortronics Systems, Inc.
Product Video.
Interlock Solutions
Design Guide for Interlocking Door Systems.

Lunch and Learn Interlocks with Dortronics
In this webinar, Dortronics explores and compares the various types of door interlocking systems to gain a complete understanding of their intended uses. Some of the general design considerations should include floor plan, layout, traffic flow, door relationships, level of security, environmental concerns, equipment selection and programming. Attendees will recognize how these door interlocks interface with various site specific requirements. Lastly, Dortronics discusses related hardware components required for a completely operational and functional system.