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Introduction to the Internal Locking Device (ILD)

Either lock pictured can come with single key or dual key configuration.





The ILD was developed to address security and operational deficiencies in high security padlocks and hasps currently used to secure Department of Defense (DoD) weapons storage magazines.  The Office of the Assistant Secretary of Defense (OSD C3I) approved the ILD as "an alternative to the current high security padlock and hasp requirement" on 6 March 2001 for protection of conventional arms, ammunition, and explosives.  It is categorized as a High Security Deadbolt Locking System.  Please review our ILD Brochure or ILD Fact Sheet for more information on the Internal Locking Device.

The ILD can be installed on hinged or sliding doors and provides the following security and operational advantages over high security padlock and hasp systems:

  • Sheltered from hostile environmental conditions - resists wind-driven sand, dust, rain, ice, corrosive salt spray, extreme heat and cold, freeze-thaw conditions, and insect infestations.
  • Easy to operate.
  • Unique key guide that allows quick, fluid key operation and greatly reduces the possibility of key breakage common with high security padlocks.
  • Adaptable to most types of door/closure installations.
  • Easily integrated with electronic monitoring and access control systems.
  • Allows for Two Person Integrity (TPI) with the dual key configuration.

ILD High Security Deadbolt Locking System

The Internal Locking Device (ILD) is categorized as a High Security Deadbolt Locking System as prescribed in DODM S-5210.41-M-V2 Nuclear Weapon Security Manual Enclosure 2, Section 3.b.(6)(c)(U).  It is more resistant to forced entry attack than MIL-DTL-43607 "High Security" padlock & hasp systems, and meets or exceeds all environmental, unauthorized entry, wear resistance, and manufacturing quality control requirements.

The ILD is approved by the Office of the Secretary of Defense (OSD), in a letter from Office of the Assistant Secretary of Defense (OASD) dated 6 March 2001, as an alternative to the high security padlock and hasp requirement for magazines storing risk category arms, ammunition, and explosives.

If you have questions regarding the ILD and High Security Deadbolt Locking Systems please use the following information to contact ILD technical staff: Toll-free (800) 290-7607, DSN (312) 551-1212, Commerial (805) 982-1212, or

ILD Key and Cylinder Control Process

The construction key and cylinder are not for operational use.  Upon completion of the ILD installation, please contact ILD Field Support Coordinator, information provided on the ILD Support page, for approved high security cylinders and keys.

The DoD Lock Program will ship the cylinders, keys, key guides, and change-out procedure to the government POC at the installation site.  The government POC will acknowledge receipt of the approved high security cylinders and keys with ILD Field Support Coordinator.

Once the approved high security cylinders are received and installed, please return the construction cylinders, keys, and key guides to the DoD Lock Program using the mailing label provided by clicking here.

ILD Applications
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