These connectors represent well-proven electrical capability at an acceptable cost for most equipment where durability is important. MIL-DTL-5015 features threaded couplings and single key/keyway polarization, representing maximum simplicity in design. Applications include military ground support
equipment, ordnance and shipboard installations. There are five classes of connectors to meet different requirements. Class designations and brief descriptions are as follows:

• A – Solid Shell – for general, non-environmental applications.
• C – Pressurized – for use on pressurized bulkheads or pressure barriers; limits air leakage regardless of type and class of plug mated with them.
• E/F –Environmental Resisting with Strain Relief –designed for applications where the connector will be exposed to moisture, vibration, and rapid
  changes in pressure and temperature.
• R – Lightweight Environmental Resisting – shorter in length and lighter in weight than the E and F classes, the MS-R offers a high degree of reliability under adverse conditions: recommended for new design applications.

This series provides an alternative to the older MIL-DTL-5015 solder type. It bridges the gap between an old connector standard and the environmental and high performance needs of current technologies.

• Medium to heavy weight cylindrical
• MS345( ) series intermateable with existing MIL-C-5015
  solder or crimp versions on existing equipment
• Captive coupling nut mechanism, utilizes retaining rings in
  combination with “L” washers to prevent inadvertent disassembly
• Multiple interlock systems ensure permanent insert retention
• Positive control of dielectric separation with guaranteed
  ease of contact insertion
• Positive contact retention provided by a closely toleranced
  damage-proof metal retention clip
• Completely sealed against environmental extremes with:

individual contact seals (conical risers on pin interface)

interfacial seals between contacts

peripheral gasket shell-to-shell seals

redundant rear wire seals and insert-to-shell seals

MIL-DTL-26482 Series 2, bayonet coupling, rear-removable crimp contact connectors were designed as an upgrade to MIL-DTL-26482 Series 1. Series 2 connectors are intermountable and interchangeable with both solder and
front-release crimp Series 1.

• Closed-Entry Socket Insert – Hard dielectric socket face
  has lead-in chamfers for positive alignment of pins (even
  partially bent within pre-established limits) with sockets.
• Interfacial Pin Insert Seal – Raised moisture barriers
  around each pin, which mate into lead-in chamfers of hard
  face socket insert, provide individual contact sealing.
  Interfacial seal is never touched by service tools.
• Elastomer Wire Sealing Grommet – Sealing over a wide
  range of wire diameters is assured by a triple wire seal in
  each cavity at the rear of the connector.
• Superior Contact Stability – Rear release crimp contact
  system features a stamped beryllium-copper retaining clip
  captivated by molded-in shoulders of each contact cavity in
  the insulator. A rear-inserted M81969 plastic tool expands
  the tines beyond the shoulder, releasing the contact.

MIL-DTL-38999 Series I is a bayonet coupling subminiature configuration with high contact density, ideal for smaller wire gauge, general-purpose applications. These environment-resisting connectors are 100% scoop-proof. Pins are recessed in elongated shells to prevent the possibility of bending contacts when plugs are scooped into the mating receptacles.

MIL-DTL-38999 Series II connectors feature a bayonet coupling mechanism with lower profile design and rear-removable crimp contact retention system. These connectors were designed for military and commercial applications where the prime requirements are lower profile and lighter weight.

MIL-DTL-38999 Series III connectors are the newest cylindrical connectors designed for highest performance capabilities used in both general purpose and severe environment applications. D38999 connectors feature an improved "one turn" coupling system, utilizing a self-locking acme thread. Acme threads provide coupling durability, while thicker wall sections and great coupling surface area improve strength and shock resistance.

• MIL-DTL-38999 connectors are available in a wide range of shell materials and finishes. Aluminum shells are offered in electroless nickel, olive drab cadmium and bright cadmium.