MIL-DTL-26482 Series II Circular Connector - Military Electrical Connector, Aerospace Plug & Socket,MS3476W14-4PN

Product Overview

This is the salt-spray member of the MIL-DTL-26482 Series II family — a bayonet-coupled MIL-DTL-26482 connector for equipment that works with salt in the air rather than occasionally near it. The shell is a black-plated metal body with a knurled coupling ring and a blue identification band, so a technician can pick the right circuit out of a crowded panel without tracing the wiring. Contacts sit in a sealed insert and the coupling ring pulls the plug onto its receptacle with a short push-and-twist, so mating needs no tools.

Series II is the bayonet branch of the 26482 specification, written for hardware that has to keep a signal alive through shock, vibration, moisture and temperature swing. In practice that makes this military circular connector a fit for weather-deck junction boxes, dockside control panels, offshore platform instrumentation, and coastal radar and communications cabinets — installations where the salt load is constant instead of seasonal.

It serves new builds and spares equally well. Where a wiring drawing or an equipment nameplate already names a Series II part, this model is the reference maintenance teams match against, and because the interface follows the published dimensions, the mating half does not have to come from the same production run. Like most military electrical connectors built to this series, it is ordered by reference rather than by description, so check shell size and contact arrangement against your own drawing before you commit to a line item.

MIL-DTL-26482 Series II Standard

• Bayonet coupling that locks fast — the interface is push-and-twist, so the plug seats with a short rotation and stays seated, which matters when someone is working one-handed inside a rack.
• Fixed shell and insert geometry — shell size, keying and contact arrangement follow the published drawing, so a mating half bought this year still fits the one bought three years ago.
• A defined environmental test regime — the series calls for shock, vibration, moisture and temperature exposure, so the MIL-DTL-26482 connector is judged on behaviour under load rather than on a bench photograph, and each unit is checked for sealing and vibration before it is packed.
• Contact retention under movement — precision contacts are held in the insert so that vibration moves the shell, not the termination.
• A part number that means something — because a MIL-DTL-26482 manufacturer builds to a fixed drawing, the same reference describes the same part on every purchase order and across every audit.
• Shared logic with other mil spec circular connectors — the same keyed, push-and-twist interface, so a technician trained on one series is already trained on this one.
• What the standard leaves to you — cable type, backshell style and cable assembly workmanship sit outside the specification, and they are where most field failures actually begin.

Salt-Spray and Marine Duty

Salt spray is a slow, patient attack. It works on the plated shell, in the crevice under the coupling ring, on any exposed contact metal, and on the fasteners the connector shares with the enclosure. A part that looks perfect in a dry workshop can show pitting on its coupling surfaces within a season on a weather deck, and that is the point where a bayonet lock starts to feel stiff and a signal starts to wander.

The positions that load a connector this way are easy to list: weather decks, machinery spaces where the air is damp and oily, dockside and shore-power installations, and coastal sites where the prevailing wind carries salt a long way inland. A shell from the general run of industrial circular connectors will often pass its factory test and still fail in that service, because the failure is driven by the atmosphere rather than by the electrical load.

The marine build answers that at the surface rather than in the datasheet. The shell is corrosion-resistant aluminum alloy or nickel-cadmium plated steel, the interface closes against water instead of merely covering it, and the shielding is carried by the metal shell itself rather than by a coating that salt can lift. On this military circular connector the blue identification band does quiet work as well: a fitter can confirm the circuit from the outside, so the connector is opened less often and the seals are disturbed less often.

One field note. Corrosion resistance is a property of an intact assembly, not of a material list. A scratched shell, a seal seated crooked after a rushed re-mate, or a gland left loose will all start the same process. A fresh-water rinse after heavy salt exposure and a look at the coupling surfaces at each service interval will tell you more about the part's condition than any label on the bag.

Specifications

Materials, Plating and Sealing

• Shell alloy choice — the alloy a MIL-DTL-26482 manufacturer specifies decides how the shell behaves in service: aluminum keeps weight down on airborne and man-carried equipment, while nickel-cadmium plated steel is the pick where the shell takes knocks and the plating has to keep working afterwards.
• Gold over nickel on the contacts — the nickel layer is the barrier that stops base metal migrating into the contact surface, and the gold on top keeps resistance low while surviving repeated mating.
• Insert and contact retention — the dielectric insert holds each contact on a fixed centre line, so the mating half meets it squarely instead of relying on the cable bundle to line it up.
• Three sealing points — the interface O-ring, the rear grommet and the backshell entry each close a different path, and all three have to be right for the assembly to stay dry. Sealing is specified against methods such as MIL-STD-810.
• Shell continuity for shielding — metal-to-metal contact through the coupling ring carries the shield, so cable screens and bonding straps get a short, low-impedance path to the enclosure.
• Mating durability — the gold surface is what lets military electrical connectors survive repeated mating; a part broken down weekly ages very differently from one installed once and left alone.
• Backshell choice changes the strain path — a straight backshell suits a cable bundle leaving the panel square-on, while an elbow takes the cable around a corner and keeps the bend radius away from the termination.

Critical Applications

Naval work is where this part earns its keep. Shipboard communication racks, radar and weapons-control cabinets, bridge consoles and below-deck power distribution sit in an atmosphere that is permanently damp and often salty, and they are serviced by people who need a MIL-DTL-26482 connector to come apart and go back together in a cramped space. A keyed bayonet lock with a sealed interface answers all three problems at once.

Aircraft and avionics are the second home for the series: flight-control runs, engine-control wiring bundles, navigation and communication suites on both fixed-wing and rotary platforms. Weight and vibration matter more here than salt, which is why the same military circular connector is often specified with an aluminum shell for airborne use and a plated steel shell where it is mounted on structure.

Ground vehicles put the part under a different load — armored personnel carriers, tanks, communications trucks and mobile command posts, where the cable run is stepped on, driven over and washed down. A shell that resists deformation, contacts retained in the insert and a coupling that does not walk loose are what carry it.

Unmanned platforms use the same interface in a smaller envelope: UAV data links, and UUV power and telemetry. Ground support and test equipment uses it because the mating half is already on the bench, which keeps adapter stocks down.

Satellite and space work is a separate question. The part is a candidate where weight, reliability and vacuum behaviour matter, but it is subject to the specific space-grade qualification your program applies — treat that as a qualification item for your engineering team rather than a catalogue claim.

Mating and Installation Practice

1. Read the reference off the old part or the wiring drawing, then check shell size, keying and contact arrangement against the receptacle before the panel goes back together.
2. Terminate the contacts to your own cable assembly procedure. The connector does not dictate crimp or solder tooling, and no connector rescues a poor termination.
3. Seat the plug on the keyway, push, and twist the knurled coupling ring until it stops. A bayonet should need a firm hand turn, never force.
4. Test the lock by pulling the plug straight back. On a correctly seated bayonet it will not move, and the ring should sit flush with the shell.
5. Dress the cable into the backshell so the bend begins behind the strain relief rather than at the contact. Most field failures on mil spec circular connectors start at that bend.
6. Inspect the interface seal and the rear grommet before closing the panel, and replace either one if it is nicked, flattened or seated crooked.
7. Log the mating on equipment that is broken down and rebuilt regularly, so a worn coupling ring is replaced on condition rather than after a failure.

Why This Model

Built to a published specification. The part is made to the MIL-DTL-26482 Series II drawing rather than to a house standard that happens to look similar, so the reference on your bill of materials, the label on the bag and the marking on the shell all describe the same thing. When an auditor or an end customer asks what is installed, the answer is a specification number.

Corrosion is the design brief. Plating, seals and coupling surfaces are chosen for an environment that is wet and salty most of the year. That changes maintenance from reactive to scheduled: a coupling ring is replaced when it is worn, not when a connector has already failed on a weather deck.

The failure that hurts is the intermittent. A dead connector is obvious. A military circular connector that goes high-resistance under vibration, or that backs off a quarter turn in service, is the one that costs a week of fault-finding on a vessel or a platform. Contact retention and a bayonet lock with a positive stop are what keep that from happening.

Lower cost over the life of the equipment. This is a mature, widely specified interface, so parts that follow it are easier to second-source, easier to substitute in an emergency and easier to hold in small numbers than a proprietary connector. The saving shows up in spares holding and downtime rather than on the unit price.

A repeatable source. We buy through MIL-DTL-26482 manufacturer lines that build to the same drawing each time, and every unit is checked for sealing and vibration before it is packed. That consistency is what makes a connector family safe to standardise on across several platforms.

Ordering and Delivery

1. Send the full reference exactly as it appears on the old part, the wiring drawing or the bill of materials — series, shell size and contact arrangement included, since those are what make the part unique.
2. Ask for the model list if you are ordering across a range. The catalogue shows the main models but not every variant, so the list is the faster way to confirm what is available now.
3. Confirm quantity and terms with your sales contact before you commit the line — minimum quantity, price breaks and lead time are quoted per order rather than fixed on this product.
4. Tell us how the parts should arrive: individually bagged and marked for a service van, bulk cartons for a distributor's shelf, or kitted with backshells for a build.
5. If you also buy industrial circular connectors or other series from us, say so on the same enquiry so the lines are quoted and packed together.
6. Shipping runs through our one-stop export service, which covers the export documentation and freight booking so the consignment reaches your broker with the paperwork they expect.
7. If you want to check a part before a larger commitment, ask your sales contact about sample availability and the current lead time for the quantity you have in mind.

Technical Support & Model Matching

Specifying the right part is easier with an engineer on the other end of the conversation. Our technical team helps you match a requirement to the correct reference — comparing series, contact count, coupling and mounting style against the drawing or part number you already hold — and works through troubleshooting with you when a mated pair or an installed assembly does not behave as expected. We also advise on installation and commissioning practice, and coordinate sourcing, pre-shipment inspection and export documents through our supplier network, so what arrives matches what was agreed.

FAQ