MIL-DTL-26482: Specifications, Series Comparison, and Selection Guide

Table of Contents

MIL-DTL-26482 connectors are military-specification electrical connectors designed for quick disconnect applications in harsh environments. These circular miniature connectors use a bayonet coupling system that allows for fast mating and unmating. You will find them in aerospace, defense, and commercial applications where reliable electrical connections are needed.

MIL-DTL-26482 connectors come in two main series, with Series 1 offering versatile general-purpose options and Series 2 providing rear insertable, rear releasable crimp contacts for enhanced maintenance and repair capabilities. Both series meet strict military standards for environmental resistance and performance. The specification replaced the older MIL-C-26482 designation but maintains compatibility with existing systems.

Your connector choice depends on your specific application requirements. These connectors offer multiple shell sizes, contact arrangements, and mounting styles. They provide hermetic sealing capabilities and can withstand extreme temperatures, vibration, and moisture exposure.

Key Takeaways

MIL-DTL-26482 connectors are quick-disconnect circular electrical connectors built to military specifications for demanding environments
The connectors are available in two series with different contact systems and installation methods to match your application needs
These connectors offer multiple configuration options including various shell sizes, mounting styles, and environmental sealing capabilities

How to Read a MIL-DTL-26482 Part Number

MIL-DTL-26482 is one of the most widely used military circular connector standards, and its part numbering system packs a lot of information into a short string of letters and numbers. A typical part number breaks down into several segments: the base military specification prefix, a series/class designation (Series I or Series II), the shell style (straight plug, receptacle, jam-nut, etc.), shell size (which determines the connector’s overall diameter and contact capacity), the insert arrangement code (defining contact layout and count), contact gender (pin or socket), and finally a finish or plating code indicating the shell’s material and corrosion protection. Reading a MIL-DTL-26482 part number correctly means going through each of these segments in order — get one wrong, such as mismatching the shell size with the insert arrangement, and the connector won’t mate with its counterpart. This guide walks through each code segment with real part number examples so you can decode — or correctly specify — a MIL-DTL-26482 connector with confidence.

MIL-DTL-26482 Series I Part Number

MIL-DTL-26482 Series II Part Number

Key Features and Performance Standards

MIL-DTL-26482 connectors deliver robust performance through comprehensive environmental protection, wide temperature tolerance, and multiple plating configurations. These specifications ensure reliable operation across military, aerospace, and industrial applications where component failure is not an option.

Environmental Sealing and Durability

The connectors feature full environmental sealing that protects against moisture, dust, and contaminants. When properly mated, they meet stringent sealing requirements that prevent environmental intrusion in harsh conditions.

You can expect these connectors to withstand significant mechanical stress. The bayonet coupling mechanism provides quick-disconnect capability while maintaining secure connections under vibration and shock. MIL-DTL-26482 connectors are rated for 500 mating cycles minimum, ensuring long-term reliability in applications requiring frequent connection and disconnection.

The quick-lock bayonet design requires only a quarter turn to fully mate or unmate. This feature proves valuable in tight spaces or situations where rapid equipment servicing is essential. The contacts use crimp termination in Series 2 designs, offering rear insertable and rear releasable functionality for easier maintenance.

Operating Temperatures and Voltage Ratings

MIL-DTL-26482 connectors operate across extreme temperature ranges typical of military specifications. Standard configurations handle temperatures from -65°F to +200°F (-54°C to +93°C), though specific ratings vary by contact arrangement and shell size.

Contact current ratings depend on wire size. A #20 contact carries 7.5A continuously, while larger #16 contacts handle up to 23A. The voltage rating reaches 1,000 volts RMS at sea level for most configurations.

The high-density design packs more contacts into smaller shell sizes compared to standard circular connectors. You get twice the contact density of traditional designs while maintaining the compact footprint needed for space-constrained applications.

Plating Options and Corrosion Resistance

MIL-DTL-26482H defines several plating classes to match your environmental requirements:

Class A: Nickel plating provides general corrosion resistance for standard applications
Class E: Electroless nickel offers uniform coating thickness and improved wear resistance
Olive drab cadmium: Delivers superior corrosion protection in marine and high-humidity environments

Nickel plating serves as the most common finish for commercial and light-duty military use. Olive drab cadmium becomes necessary when you need maximum corrosion resistance in salt spray or coastal environments. Electroless nickel provides consistent coverage on complex geometries where standard plating may leave thin spots.

Your plating selection directly impacts connector lifespan in corrosive atmospheres. Salt fog testing per military standards validates each plating class for specific exposure conditions.

Series 1 Overview: Versatility and Applications

MIL-DTL-26482 Series 1 connectors use a three-point bayonet coupling system and support multiple contact sizes across shell sizes 8 through 24. You can choose from various mounting styles and insert arrangements to match your application requirements.

Series 1 Coupling and Contact Types

The Series 1 features a quick-disconnect bayonet coupling mechanism that allows for rapid mating and unmating. This three-point bayonet system provides positive coupling and ensures a secure connection in high-vibration environments.

You have access to three contact sizes: 20, 16, and 12. These contacts fit into compact aluminum shells that deliver high-density arrangements while keeping weight low. The connector family includes 34 insert patterns ranging from 3 to 55 circuits.

The design includes a five-key/keyway system that prevents mismating. This feature protects your equipment by ensuring you can only connect compatible plugs and receptacles.

Common Series 1 Connector Types and Mounting Styles

The most common Series 1 connector types include MS3110 (wall mount receptacles), MS3112 (box mount receptacles), MS3116 (cable plugs), and MS3119 (hermetic receptacles). You’ll also find MS3111 (rear mount receptacles), MS3113 (jam nut receptacle), and MS3114 (flange mount receptacles).

Your mounting style options include:

Jam nut mounting– Uses a threaded coupling nut for secure panel attachment
Wide flange– Features a larger mounting flange for bulkhead applications
Single hole mount– Simplifies installation with one mounting point
Box mount– Mounts flush against enclosure surfaces
Jam nut receptacle– Front panel mounting with accessible rear connections

Hermetic receptacles provide airtight glass-to-metal seals rated at 1×10⁻⁷ cc/sec helium leak rate. These seal styles work in pressure differentials and maintain integrity in extreme environments.

Insert Arrangements and Accessories

You can select from 34 standard insert arrangements that accommodate different circuit requirements. Insert patterns use alternate positioning to prevent cross-plugging when you need multiple connectors of the same shell size in one application.

The pin insert rotates clockwise within the shell from the normal key position. Your socket insert rotates counterclockwise by the same degree measurement. This rotation system lets you use identical shell sizes without risking incorrect connections.

Available accessories include dummy receptacles for sealing unused connector positions and bulkhead feed-thru assemblies that create wire pathways through sealed barriers. Backshells and dust covers protect unmated connectors from environmental contamination during storage or operation.

Series II Details: Advances and Enhanced Performance

Series II connectors introduced crimp technology and rear-release contacts, replacing the older solder-cup design of Series I. The bayonet coupling system uses a three-point locking mechanism for quick connections, while improved contact arrangements and mounting options give you more flexibility in tight spaces.

Crimp Contact System and Rear Release

MIL-DTL-26482 Series II uses crimp contacts that meet SAE AS39029 requirements. You can insert and remove contacts from the rear of the connector using a standard qualified plastic tool. This design protects the front sealing surface from damage during maintenance.

The rear-release system lets you service individual contacts without disassembling the entire connector. You get contacts in three sizes: 20, 16, and 12 AWG. The contacts lock securely into place and stay put through 500 mating cycles minimum.

Triple-webbed grommets at the rear seal over a range of wire diameters. The elastomer material resists tearing and degradation when exposed to fluids. The socket side includes a lead-in chamfer and hard face that accepts pins bent within established limits.

Shielded Contacts and EMI Protection

Shielded contacts are available in Series II connectors when you need EMI protection. The elastomer interfacial seal on the pin side has raised barriers around each pin. These barriers displace into the socket chamber when mated, creating a positive moisture seal.

Your connector can handle up to 1,000 VAC (RMS) at sea level with Service Rating II configurations. The closed-entry socket design prevents accidental contact damage. Shell sizes range from 8 to 24, with 34 insert patterns available from 3 to 55 circuits.

Mounting Options and Key Connector Types

You have multiple mounting options for receptacles in the MS3470, MS3471, MS3474, MS3475, and MS3476 series. Narrow flange mount receptacles (MS3474) work in tight panel spaces. Wide flange mount options (MS3475) provide extra support for heavy-duty applications.

Mounting Style	MS Number	Application
Narrow Flange	MS3474	Space-limited panels
Wide Flange	MS3475	Heavy-duty mounting
Box Mount	MS3476	General purpose
Jam Nut	MS3470	Through-panel
Wall Mount	MS3471	Surface mounting

The bayonet coupling requires just a quarter turn to lock. Five key/keyway positions prevent mismating between different configurations.

Configuration, Materials, and Finishing Options

MIL-DTL-26482 connectors use aluminum alloy shells with various plating options to meet different environmental requirements. You can choose from several finish types including cadmium, nickel, and specialty coatings that provide corrosion resistance and electrical performance.

Body and Shell Materials

The connector shells are manufactured from aluminum alloy, which provides strength while keeping weight low for aerospace applications. You’ll find that most manufacturers use aluminum alloy that meets military specifications for durability and structural integrity.

The contact pins and sockets are made from copper alloy materials. These contacts receive gold plating in most configurations to ensure reliable electrical connections. The insulator bodies use dielectric materials that can withstand temperature extremes and resist moisture intrusion.

Some manufacturers offer stainless steel shell options for applications requiring enhanced corrosion resistance. These are heavier than aluminum but provide better performance in harsh marine or chemical environments.

Plating and Finishing Types

Olive drab cadmium is the standard finish specified in the military specification. This plating provides excellent corrosion protection and has been the traditional choice for military connectors.

Nickel plating options include both electroless nickel and standard nickel finishes. Electroless nickel offers uniform coating thickness and good corrosion resistance. You can also find black zinc-nickel (ZR) plating for applications requiring a dark finish.

Tin-zinc (TZ) plating serves as a RoHS-compliant alternative to cadmium. This finish meets AMS2434 Type 2 requirements and provides cadmium-compatible performance without environmental concerns. Passivated stainless steel (Z1) finishes are available for connectors that need maximum corrosion resistance.

Sealing and Environmental Ratings

MIL-DTL-26482 connectors include environmental sealing features that protect against moisture, dust, and other contaminants. The connectors use elastomeric seals at the mating interface and around each contact position.

You get IP67 or IP68 ratings when the connectors are properly mated with appropriate backshells. The grommet seals around wire entries prevent water ingress from the rear of the connector. The bayonet coupling mechanism compresses the interfacial seal to create a waterproof barrier.

The sealing system allows these connectors to function in temperatures ranging from -65°F to +200°F. Salt spray resistance meets military specifications for extended exposure periods.

Mounting Styles and Specialized Variants

MIL-DTL-26482 connectors come in multiple mounting configurations to fit different installation requirements. The specification includes wall-mounted flanges, jam nut receptacles, bulkhead feed-through designs, and hermetic variants for sealed applications.

Wall Mounts and Box Mounts

Wall and box mounting styles use flange configurations to secure receptacles to panels or enclosures. You can choose between narrow flange and wide flange options depending on your panel thickness and mounting space.

Narrow flange receptacles work well when you have limited space on the mounting surface. They provide a secure connection with a smaller footprint. Wide flange variants offer increased stability and distribute mounting stress over a larger area.

The MS3114 designation covers wall-mounted receptacles in the Series 1 configuration. These receptacles mount from the front of the panel and secure with screws through the flange holes. Box-mounted variants let you install the connector from inside an enclosure.

Jam Nut and Bulkhead Feed-Thru Options

Jam nut mounting receptacles thread through a panel hole and secure with a nut on the opposite side. This mounting style gives you flexibility when you cannot access both sides of the panel during installation. The jam nut mount design uses MS3112 part numbers for standard configurations.

Bulkhead feed-thru connectors pass completely through a panel wall. These variants use part numbers like MS3440, MS3442, and MS3443 depending on the specific configuration and contact arrangement. Feed-thru designs let you create pass-through connections in equipment racks or sealed enclosures.

The MS3449 series covers specialized jam nut configurations. You tighten the jam nut against the panel to create a secure mechanical connection and environmental seal.

Dummy and Hermetic Receptacle Solutions

Hermetic receptacles provide a complete seal between the connector interior and the external environment. You use these connectors when you need to prevent gas or fluid transfer across the mounting panel. They work well in pressurized systems or applications requiring contamination control.

Dummy receptacles serve as protective covers or blank panels. They match the mounting footprint of standard receptacles but contain no electrical contacts. You can install dummy receptacles to maintain a uniform appearance or reserve space for future connections.

Hermetic variants require special manufacturing processes to create glass-to-metal or epoxy seals around each contact pin. This increases cost but delivers true hermetic sealing performance for critical applications.

Accessories, Codes, and Part Numbering

MIL-DTL-26482 connectors use a standardized part numbering system and work with several types of accessories including protective covers, adapters, and dummy receptacles. Each accessory type has specific MS (Military Standard) part numbers that correspond to shell sizes and configurations.

Protective Covers and Caps

You need protective covers to shield your unused connectors from dust, moisture, and contaminants when they’re not mated. These dust caps thread or snap onto both plugs and receptacles to maintain the environmental seal rating.

The most common protective accessories include threaded dust caps that screw directly onto the connector shell and snap-on covers for quick protection. Your caps must match the shell size of your connector to provide proper sealing.

MS3180 and MS3181 dust caps are the standard part numbers for MIL-DTL-26482 Series 2 protective covers. MS3180 caps fit plugs, while MS3181 caps fit receptacles. You can order these separately from the connector assembly to have spares available during maintenance.

Adapters and Dummy Receptacles

Dummy receptacles let you test and protect plug assemblies without connecting to live equipment. MS3115 dummy receptacles are the most commonly specified parts for MIL-DTL-26482 connectors.

You can use MS3184, MS3185, MS3186, and MS3187 dummy connectors depending on your shell size and contact arrangement requirements. These dummy receptacles have no electrical contacts inside but match the mechanical interface of actual receptacles.

MS3184 works for smaller shell sizes while MS3186 and MS3187 handle larger configurations. Your dummy connector choice depends on the specific shell size and insert arrangement you need to mate with.

Class Codings and Specifications

MIL-DTL-26482 uses a structured part numbering system that identifies the connector class, shell size, insert arrangement, and contact type. The first section of the part number tells you whether it’s a plug or receptacle.

Class designations in the specification define different performance levels and materials. You’ll see designations that indicate aluminum or stainless steel shells, different plating options, and temperature ratings from -65°C to +200°C.

Your part number will include codes for shell size (ranging from size 8 to size 24), insert arrangement (indicating the number and size of contacts), and contact gender. Each position in the part number has a specific meaning that you need to understand when ordering or cross-referencing parts.

Frequently Asked Questions

Engineers and procurement specialists commonly need guidance on specification documents, series selection, contact arrangements, and accessory compatibility when working with MIL-DTL-26482 connectors. Understanding these technical details helps ensure proper connector selection and successful application integration.

Where can I find the latest specification document and revision history for this connector standard?

The official MIL-DTL-26482 specification is maintained by the Defense Logistics Agency (DLA). You can access the current version, including all amendments and revision history, through the DLA’s ASSIST (Acquisition Streamlining and Standardization Information System) database at quicksearch.dla.mil.

The specification document provides complete details on connector requirements, testing procedures, and quality standards. Amendment 2 represents the most recent update to the standard.

Most major connector manufacturers also provide specification sheets on their websites that reference the current military standard revision. These manufacturer documents often include additional application notes and technical guidance beyond the base specification.

What are the key differences between Series I and Series II, and how do I choose the right series for my application?

Series I and Series II connectors share the same mating interface and can physically connect to each other. The primary differences lie in their internal construction and intended applications.

Series I features a simpler internal design and is commonly used in commercial and light industrial applications. These connectors typically cost less and work well for applications with moderate environmental requirements.

Series II includes crimp contacts that are rear insertable and rear releasable. This design allows you to add or remove contacts after shell assembly, which simplifies maintenance and reduces repair time.

You should choose Series I for cost-sensitive commercial projects where contact serviceability is not critical. Select Series II when you need field serviceability, easier maintenance, or when working on military and aerospace applications that require the enhanced features.

How do I use the Series II contact arrangement matrix to select shell size, insert arrangement, and contact sizes?

The contact arrangement matrix shows all available combinations of shell sizes and insert configurations for Series II connectors. Shell sizes range from size 8 through size 24, with each size supporting specific insert arrangements.

Each insert arrangement is identified by a number that indicates the contact layout pattern. Series II offers 32 different high-density insert arrangements to accommodate various contact quantities and sizes.

You select your shell size based on the number and size of contacts your application requires. The insert arrangement number corresponds to the specific pattern of contact positions within that shell.

Contact sizes in Series II typically include size 20, size 16, and size 12, with each size rated for different current-carrying capacities. Larger contact sizes handle more current but reduce the total number of positions available in a given shell size.

What backshell options are compatible, and how do I select the correct strain relief or EMI/RFI termination?

MIL-DTL-26482 connectors accept multiple backshell types that provide cable strain relief and environmental sealing. Standard options include straight, 45-degree, and 90-degree angle configurations.

EMI/RFI backshells add electromagnetic shielding to protect signal integrity in electrically noisy environments. These backshells incorporate conductive gaskets or metal braid termination points to maintain continuous shielding from the connector through the cable.

You select strain relief backshells based on your cable diameter and flexibility requirements. The backshell must match your connector shell size and accommodate your cable’s outer diameter range.

Heat-shrink and potted backshell options provide additional environmental protection for harsh conditions. Choose these when you need enhanced moisture resistance or when the connector will experience extreme temperatures or chemical exposure.

Which catalogs or manufacturer cross-references help identify equivalent part numbers and sourcing options?

Major manufacturers including Amphenol Aerospace, Glenair, and TE Connectivity produce MIL-DTL-26482 compliant connectors. Each manufacturer maintains detailed catalogs with their specific part numbering systems and cross-reference tables.

The QPL (Qualified Products List) maintained by the DLA lists all approved manufacturers and their qualified part numbers. You should consult this list when source approval is required for military or aerospace applications.

Distributor websites often provide cross-reference tools that convert between manufacturer part numbers and military specification designations. These tools help you identify alternative sources and compare pricing across suppliers.

Industry reference guides like the Military Specification Cross-Reference provide comprehensive part number conversions between different manufacturers. You can use these guides to find direct replacements or identify form-fit-function equivalents.

How does this connector family compare to MIL-DTL-38999 in performance, size, and typical use cases?

MIL-DTL-26482 connectors are smaller and lighter than MIL-DTL-38999 Series III connectors. The 26482 uses a bayonet coupling mechanism while the 38999 employs a threaded coupling for more secure retention.

MIL-DTL-38999 connectors offer higher density contact arrangements and superior performance in extreme environments. They withstand higher vibration levels, more severe temperature cycling, and provide better EMI shielding.

You should use MIL-DTL-26482 for general-purpose military and commercial applications where size and weight are priorities. These connectors work well in avionics, ground support equipment, and commercial aerospace applications.

Choose MIL-DTL-38999 for mission-critical aerospace applications, high-performance military systems, and situations requiring maximum environmental protection. The 38999 family is standard for modern military aircraft, spacecraft, and weapons systems where reliability is paramount.

MIL-DTL-5015 Series Connectors

MIL-DTL-38999 Series I Connectors

MIL-DTL-38999 Series II Connectors

MIL-DTL-38999 Series III Connectors

MIL-DTL-38999 Series IV Connectors

MIL-DTL-26482 Series I Connectors

MIL-DTL-26482 Series II Connectors

J14 Series Connectors

J29A Series Connectors

J30 Series Connectors

J30J & MIL-DTL-83513 Series Connectors

2PM Series Connectors

KP30 Series Connectors

OHS Series Connectors

PC Series Connectors

PY04 Series Connectors

ZH23 Series Connectors

Снц144С Series Connectors

Y50X Series Connectors

Y50DX Series Connectors

MIL-DTL-5015 Series Backshells

MIL-DTL-38999 Series Backshells

MIL-DTL-26482 Series Backshells

MIL-DTL-5015 Series Caps

MIL-DTL-38999 Series Caps

MIL-DTL-26482 Series Caps

Y50X Series Caps

News