MIL-DTL-22992 Class L Connectors

MIL-DTL-22992 Class L connectors are heavy duty, IP67 rated, power connectors built to withstand the rigors of power distribution applications for the most demanding military applications. Connectors are designed with current-specific ratings ranging from 40 to 200 amps and incorporate various safety features to protect equipment and personnel.

MIL-DTL-22992 Class L connectors are built in specific configurations prescribed by MIL-DTL-22992 for either military or industrial applications. This type of connector is required for all ground power equipment by MIL-STD-454, and are considered the preferred connector under MIL-STD-1453, which mandates its use in all equipment procured by the military. This rigid configuration control ensures correct interconnection of electrical circuits for maximum personnel safety and ultimate reliability.

MIL-22992 Class L connectors are the Rolls-Royce standard for military and heavy industrial power built with personnel safety and protection in mind.

In particular, shell style and contact type are specified for safe installation. Wall mount and cable connecting receptacles are supplied with socket contacts only and always lead from the power source. Plugs (with coupling rings) only have pin contacts and always lead to the equipment end. Shell sizes are directly related to the current carrying capability of the connector, which reduces the possibility of inadequate wiring for heavy electrical loads.

MIL-C-22992 Class L Connector

Basic Characteristics of the MIL-DTL-22992

  • Safe and reliable power connectors
  • Current range from 40 to 200 amps
  • Heavy-duty shell design for harsh environments
  • Automatic grounding and arc quenching design for safety
  • Direct current or single/three phase, 60/400 Hertz AC
  • Double stub coupling threads for fast reliable coupling

MIL-DTL-22992 Class L Connector Shell Styles

MIL-22992 connectors are built to withstand harsh environments and are IP67 rated. Aerospace-grade alumium shells provide heavy-duty protection while a standard olive drab cadmium finish provides excellent corrosion resistance. Four available connector shell styles provide design flexibility for modern power distribution.

Select your preferred shell style from the list below:



Cable Plug

The MS90556 cable plug features an integrated backshell and cable grip for environmental protection and strain relief. A protective cover is included with the connector to ensure high reliability in harsh environments.

MS90556 Drawing

Build part number



Wall Mount Plug

The MS90558 style wall mount plug is intended for installation on equipment receiving power. It features pin contacts for equipment and personnel safety, along with a heavy-duty shell and a dust cover for reliability in harsh environments.

MS90558 Drawing

Build part number



Wall Mount Receptacle

The MS90555 wall mount receptacle features a four-hole flange for mounting on the power source of MIL-22992 applications, and socket contacts to ensure safety. A mounting gasket and dust cover are included for additional reliability.

MS90555 Drawing

Build part number



Cable Receptacle

The MS90557 cable mount receptacle is made with socket contacts to connect power to MIL-22992 compatible equipment, or for extension cord applications. The integrated backshell with cable grip provides both strain relief and environmental protection.

MS90557 Drawing

Build part number

MIL-DTL-22992 Class L Accessories


22992 Mounting Gasket

Mounting gaskets seal the mounting space between receptacles and a panel and maintain the environmental integrity of the enclosure. These gaskets are compatible with all MIL-DTL-22992 Class L commercial and military derivatives.

MIL-22992 Mounting Gasket Drawing

MIL-22992 Covers

22992 Protective Cover

Dust covers are included with MIL-22992 connectors and should always be used to environmentally seal and protect connectors from damage. Covers protect contacts and coupling threads, ensuring reliable coupling.

MIL-22992 Protective Cover Drawing

MIL-22992 Cable Grip

22992 Cable Grip

A cable grip and sealing gland are included with MIL-22992 in-line connectors. The grip provides necessary strain relief from heavy cable bundles and protects contact terminations, while the gland seals the connector from environmental hazards.

MIL-22992 Cable Grip

5015 Dummy Receptacle

22992 Contacts

MIL-22992 contacts accommodate 6 to 4/0 AWG wire and are rated for up to 200 amps. If one becomes bent or broken, it can be replaced without sacrificing the entire connector.

MIL-22992 Contacts Drawing

MIL-DTL-22992 Class L Tools

MIL-DTL-22992 Class L Specifications

MIL-DTL-22992 Class L Approved
Shell Styles
4 Shell Styles: Cable Plug, Wall Mount Plug, Wall Mount Receptacle, Cable Receptacle
Shell Sizes
4 Shell Sizes are available, size 28-52
Contact Sizes
4 Available (#6, #4, #4/0, #1/0, Accepting 6 to 4/0 AWG)
Contact Plating
Silver Alloy Plate, .0002 in (.0051 mm) Minimum
Max Contact Resistance
Potential Voltage Drop
Current Rating
200 Amps (Rated Current) at 68°F (20°C) for Inserts 52-12 and 52-13
Max Operating Voltage
2,000 VAC (RMS) at Sea Level
Automatic, Grounding and Neutral Contacts Have Mate First/Break Last Design
Arc Quenching
Recessed Socket Contacts Within Insert Create an Arc Suppression Chamber for Safety
Insulation Resistance
>5,000 Megohms at 77°F (25°C)
Heat Rise
Temperature Rise of Individual Contacts Will Be No More Than 54°F (30°C) Above Ambient Temperature
Air Leakage Rate
Environmental Connector Air Leakage Rate Shall Not Exceed 1 Inch 3/hr (4.55 x10-3 cm 3/sec) at 30 psi (2.11 kg/cm2) Pressure Differential
Mated Connectors Shall Maintain an Insulation Resistance of 100 Megohms or Greater at 77°F (25°C) With 95% Humidity for Duration of 20 Days
Single Master Key, and 4 Minor Keys
Operating Temp
-67° to +257°F (-55° to +125°C)
Environmental Rating
IP67 Rating (Environmental Sealing)
500-Hour Salt Spray Rating (With Olive Drab Cadmium Finish)
Chemical Resistance
20 hour full immersion (unmated) in hydraulic fluid and lubricating oil without damage or material degradation
Threaded, Double-Start Stub Threads, 2¼ Turns to Couple With Knurled Coupling Ring
Contact Arrangements
7 Standard Inserts Available
Coupling Cycles
250 Coupling Cycles (Minimum)
50g’s, 11ms Duration, Three Major Axes, 10 Microseconds Maximum Discontinuity
Random Vibration at 10 to 2,000Hz (15g’s), 10 Microseconds Maximum Discontinuity
Shell Conductivity
Maximum Shell-to-Shell Conductivity Potential Drop Less Than 200 Millivolts Across Assembly, and 400 Millivolts After Conditioning Across the Assembly
Insert Assembly
Plastic Dielectric, Removable

MIL-DTL-22992 QPL Information

Connectors, Plugs and Receptacles, Electrical, Waterproof, Quick Disconnect, Heavy Duty Type, General Specification.
This specification covers multi-contact, heavy duty, quick disconnect, waterproof, electrical plug and receptacle connectors and associated accessories for electronic and electrical power and control circuits. Connectors are rated for temperatures between -55 Degrees C to +125 Degrees C. See 6.1 for intended use and applications.
Active Document Date
Next Review Due
Next Review Due
MIL-DTL-22992 Class L QPL Document Rev. H

MIL-DTL-22992 QPL Approved Manufacturers


MIL-DTL-22992 Class L Aliases

Also Known As: Class L, MIL-22992, 22992 Type, MS22992 Connectors