How do MIL-DTL-38999 part numbers work?

A typical mil-spec part number looks like: D38999/26WG11SN Each segment specifies the connector style, finish, shell size, insert arrangement, contact type, and keying orientation. This structured format ensures compatibility across platforms and suppliers.

What are common MIL-DTL-38999 part numbers?

Common examples include: D38999/20WA35PN D38999/26WB98SN D38999/24ZC04PN D38999/26FG16SN D38999/46HB35PN These numbers follow standard mil-spec formatting used throughout defense and aerospace.

What shell sizes are most commonly used?

Typical shell sizes include: 9, 11, 13, 15, 17, 19, 21, 23, 25

What insert arrangements are typical?

Common arrangements include: 11-35, 13-98, 15-05, 17-06, 19-32, 21-75, 23-53, 25-37, 25-61

What contact types are supported?

38999 connectors can be used with: Crimp contacts Solder contacts Coax Twinax Triax

Can XACT repair or recertify existing assemblies?

Yes. XACT offers restore-to-spec services including inspection, re-termination, overmold replacement, and updated documentation. https://xactems.com/cable-repair-and-recertification/

Which industries rely most on MIL-DTL-38999 connectors?

Defense, aerospace, UAVs, naval systems, rugged industrial automation, and space applications.

Aerospace Archives

How Rugged Cable Assemblies Support the Future of Autonomous & Optionally Piloted Aircraft

Autonomous and optionally piloted aircraft are rapidly reshaping modern aviation. As next-generation rotorcraft and fixed-wing platforms integrate more sensors, processors, and onboard intelligence, the need for high-reliability interconnects has never been higher.

Across the aerospace sector, programs involving advanced autonomy—such as the widely covered demonstrations of autonomous Black Hawk and rotorcraft logistics missions—highlight a simple reality:

Even the most sophisticated autonomy software depends on rugged, stable, interference-free signal pathways.
This is where XACT EMS supports aerospace engineers, integrators, and system designers.

Why Autonomy Requires Rugged Interconnects

Autonomous flight technologies, whether fully uncrewed or pilot-optional, place extreme demands on the wiring and interconnects that support onboard electronics:

High vibration environments inside rotorcraft fuselages
EMI-rich conditions from sensors, radios, and computing hardware
Rapid signal switching and high-speed data pathways
Environmental exposure during resupply missions, landing scenarios, or sling operations
Dynamic strain on harnesses and connectors

The performance of autonomy hardware depends heavily on the durability and stability of the interconnect layer that ties everything together.

XACT’s cable assemblies are engineered with exactly these conditions in mind.

Rugged Cable Assemblies for Aerospace Autonomy Programs

XACT provides aerospace-grade interconnect solutions designed for harsh environments and mission-critical avionics:

Shielded Cable Assemblies

For navigation systems, mission computers, and flight-control electronics that must operate in EMI-dense environments.

Overmolded Connectors

Providing sealed strain relief, vibration resistance, and mechanical protection for connectors exposed to movement or impact.

MIL-Spec Harnessing

Supporting defense-grade platforms that require reliability through shock, vibration, and extreme temperature cycles.

High-Flex and Vibration-Tolerant Cables

Ideal for rotorcraft, powered flight surfaces, articulated systems, and autonomous payload deployment equipment.

Environmental Sealing

Protecting interconnects from dust, debris, moisture, and landing-zone contaminants.
These solutions are used across a range of aerospace applications—from avionics modules to mission systems to unmanned airframes.

Applications Relevant to Emerging Autonomy Platforms

The environments seen in autonomous rotorcraft demonstrations closely mirror the conditions XACT solutions are built for:

Flight-control computers
Navigation systems
LIDAR, radar, and sensor integration
Mission-system wiring
Power distribution
External payloads and sling-load systems
Cockpit and ground-control interfaces

Whether piloted or uncrewed, modern aircraft depend on stable, ruggedized interconnects to operate safely. .

Partnering with Matrix Technology Ltd. for Materials Support

While XACT specializes in rugged interconnects, autonomy platforms also require EMI shielding, thermal management materials, and conductive components to protect sensitive electronics.

Matrix Technology Ltd. provides:

EMI shielding gaskets & absorbers
Thermal pads, gap fillers & interface materials
Conductive foils & tapes
Shielding films & elastomers

Together, the two companies support aerospace electronics from both sides:

materials + interconnects.

Learn more about Matrix’s materials for aerospace avionics →

Bring Your Aerospace Project to XACT

Whether you’re designing next-generation avionics, integrating autonomy hardware, or modernizing a rotorcraft platform, XACT EMS provides the rugged cable assemblies and interconnect solutions required for mission success.

Contact XACT EMS for aerospace cable assembly support

Miniature Form. Maximum Function — Mighty Mouse Connector Series 80

When space is tight and reliability is non-negotiable, engineers reach for the Series 80 Mighty Mouse Connector — a miniature circular connector that delivers heavyweight performance.

Roughly half the size and weight of traditional MIL-DTL-38999 connectors, it offers IP67+ sealing, 360° EMI protection, and up to 10,000 mating cycles in aerospace, defense, robotics, and industrial environments.

Optimized for Harsh Environments

XACT EMS integrates these connectors into custom overmolded cable assemblies built for mission-critical platforms where SWaP (Size, Weight & Power) optimization matters most. As a result, these assemblies deliver reliable connectivity even in high-vibration, high-temperature, or high-moisture conditions.

Why It Earned the Name “Mighty.”

Feature	Performance Advantage
Size & Weight	~50% smaller and lighter than MIL-DTL-38999 connectors
Environmental Sealing	IP67 – IP69 dust and moisture protection
EMI/RFI Shielding	360° coverage for signal integrity
Durability	500 – 10,000 mating cycles tested
Materials	Aluminum, stainless steel, or composite shells
Coupling Styles	Threaded, bayonet, push-pull
Temperature Range	−55 °C to +150 °C
Standards	MIL-STD-810 & RTCA DO-160 environmental testing

Additionally, XACT builds to spec — not stock. Every assembly undergoes AS9100-certified inspection and traceable testing for regulated industries.

Applications That Rely on It

Industry	Example Systems
Defense & Military	Soldier-worn radios, targeting systems, UAV payloads
Aerospace	Avionics modules, cockpit controls, navigation units
Robotics	Autonomous ground vehicles, sensor arrays
Energy & Industrial	Downhole inspection tools, portable instrumentation
Medical & Emergency	Ruggedized wearables and field equipment

Built-to-Spec Customization Options

XACT EMS provides factory-integrated Mighty Mouse assemblies with:

Overmolding and strain relief for harsh environments (view our overmolding capabilities)
EMI/RFI-shielded backshells and ground terminations
Molded-in branding or traceability markings
Keyed configurations to prevent mismating
Serialized labels and lifecycle documentation

With AS9100D-certified facilities in Houston, Texas and Calgary, Canada, XACT delivers full process traceability and testing to MIL standards — ensuring every assembly performs from prototype to field deployment. Learn more about our cable repair and recertification services.

Trusted Across Critical Programs

The Mighty Mouse Connector has earned its reputation in real-world systems that cannot afford failure — from fighter cockpits to tactical radios to space-constrained robotic controls. Meanwhile, XACT’s integration services extend that value through complete cable solutions and testing.

Let’s Build Your Next Project to Spec — Not Stock.

Looking for a connector that punches above its weight? Contact XACT EMS about custom overmolded assemblies using Mighty Mouse and other miniature circular connectors.

Stay connected with XACT EMS for more product updates and insights — follow us on LinkedIn.

Complete Mighty Mouse Connector Part Number Index (Series 80)

Provided for cross-reference. XACT EMS integrates and builds assemblies utilizing these and equivalent specifications.

249-003, 340MS001, 340MS026, 370MA038, 370MB038, 370MS038, 380MS135, 380MS137, 380MS141, 390MA077, 390MB077, 390MS076, 390MS077,
440MK135, 440ML135, 440MS134, 440MS135, 447MS981,
600-137, 600-140, 600-141, 600-146, 600-147, 600-154, 600-172, 600-185, 600-197, 600M005, 600MM005,
601-060, 601-061, 601-064, 601-065, 601-101,
620MA065, 620MB065, 620MS064, 620MS065,
650-061, 657-072, 657-079,
660-082, 660-083, 660-087, 660-088,
667-184, 667-185, 667-202, 667-217, 667-218, 667-241, 667-242, 667-261, 667-262, 667-282, 667-347, 667-387, 667-392, 667-424, 667-462, 667-497, 667-509,
680-116, 680-120,
800-006, 800-007, 800-008, 800-009, 800-010, 800-011, 800-012, 800-013, 800-032, 800-034, 800-035, 800-036, 800-037, 800-038, 800-039, 800-040, 800-041, 800-052, 800-053, 800-054, 800-055, 800-056, 800-057, 800-058, 800-059, 800-060,
801-007, 801-008, 801-009, 801-010, 801-011, 801-012, 801-017, 801-023, 801-024, 801-026, 801-028, 801-029, 801-031, 801-032, 801-033, 801-034, 801-052, 801-059, 801-065, 801-066, 801-067, 801-068, 801-069, 801-070, 801-071, 801-072, 801-073, 801-074, 801-075, 801-113, 801-114, 801-121, 801-122, 801-123, 801-124, 801-125, 801-126,
802-008, 802-009, 802-010, 802-011, 802-012, 802-013, 802-030, 802-040, 802-050, 802-056, 802-058, 802-059, 802-060, 802-061, 808-062,
803-001, 803-002, 803-003, 803-004, 803-005, 803-006, 803-007, 803-009, 803-010, 803-011, 803-012, 803-013, 803-014, 803-015, 803-016, 803-026, 803-027, 803-028, 803-029, 803-030, 803-031, 803-032, 803-033,
804-001, 804-002, 804-003, 804-004, 804-005, 804-006, 804-009, 804-013, 804-015, 804-016, 804-017, 804-018, 804-019, 804-020, 804-021, 804-022, 804-032, 804-058, 804-059, 804-060, 804-061, 804-062, 804-063, 804-064, 804-065, 804-066, 804-067, 804-113, 804-114, 804-116, 804-140,
805-001, 805-002, 805-003, 805-004, 805-005, 805-006, 805-007, 805-009, 805-010, 805-011, 805-012, 805-013, 805-015, 805-016, 805-017, 805-018, 805-019, 805-054, 805-057, 805-058, 805-059, 805-060, 805-061, 805-062, 805-063, 805-064, 805-065, 805-066, 805-067, 805-127, 805-128, 805-130, 805-132, 805-140,
809-001, 809-002, 809-005, 809-013, 809-015, 809-035, 809-042, 809-043, 809-054, 809-055, 809-057, 809-065A, 809-065C, 809-066A, 809-066C, 809-067, 809-083, 809-087, 809-088, 809-092, 809-093, 809-094, 809-101, 809-107, 809-108, 809-110, 809-111, 809-112, 809-113, 809-114, 809-115, 809-116, 809-117, 809-118, 809-119, 809-120, 809-121, 809-124, 809-125, 809-126, 809-127, 809-128, 809-129, 809-130, 809-131, 809-132, 809-133, 809-134, 809-135, 809-136, 809-137, 809-138, 809-141, 809-150, 809-155, 809-165, 809-173, 809-174, 809-183, 809-189, 809-190, 809-191, 809-198, 809-199, 809-200, 809-203, 809-204, 809-205, 809-206, 809-207, 809-209, 809-213, 809-240, 809-299, 809-300, 809-301, 809-303, 809-335, 809-369, 809-370, 809-371, 809-372, 809A060, 809B060, 809SL060, 809SU060,
811-001-06, 811-003-01, 811-003-02, 811-003-07, 811-004-02, 811-004-07, 811-005-02, 811-005-07, 811-006-02, 811-006-07, 811-007,
829-012, 830-003, 830-004,
850-002, 850-003, 850-013, 850-014,
852-006, 852-007, 852-015, 852-016, 852-017, 852-018, 852-030, 852-031, 852-042, 852-043, 852-056, 852-057, 852-082, 852-083, 852-103, 852-104,
853-003, 853-004, 853-013, 853-014, 853-017, 853-018, 853-024, 853-025,
854-001, 854-002,
857-034,
859-006, 859-013, 859-014, 859-025, 859-026, 859-042, 859-046, 859-047, 859-048, 859-049, 859-050, 859-051, 859-072, 859-124, 859-125, 859-126, 859-134, 859-135, 859-164, 859-240,
963-001, 963-002, 963-003, 963-005, 963-006,
M81969/8-07, M81969/8-08, M81969/8-09, M81969/8-10

Mighty Mouse® is a registered trademark of CBS Studios Inc. This image and reference are used under nominative fair use to describe Glenair’s Series 80 “Mighty Mouse” connector product. XACT Engineered Manufacturing Solutions and Matrix Technology Ltd. are not affiliated with, sponsored by, or endorsed by CBS Studios Inc.

Reliable Componentry. Custom Assembly.

The MIL-DTL-38999 specification—originally developed in the 1970s—continues to define modern interconnects used in defense, aerospace, and industrial systems. These connectors, originating from industry efforts including those of the Bendix Scintilla Division (now part of Amphenol), established a foundation for rugged, high-density, environmentally sealed interfaces.

Today, MIL-SPEC connectors span a wide range of use cases—from missile systems and aircraft avionics to underwater robotics and autonomous vehicles. The connector families themselves are standardized, but the way they’re integrated into a system varies by application—and that’s where XACT EMS steps in.

XACT: From Connector to Complete Assembly

At XACT EMS, we don’t just stock connectors—we engineer complete interconnect solutions. Whether you’re dealing with vibration zones, temperature extremes, EMI/RFI exposure, or fluid ingress, we provide:

Overmolded harnesses for abrasion resistance and strain relief
Booted assemblies for sealed transitions and rugged environments
Complete cable and wire harnesses tailored to spec
Custom backshells, labeling, and potting for full turnkey integration

We work with the full range of MIL-SPEC connector styles to build harnesses that meet exact design, environmental, and electrical needs—from the front panel to the power source.

MIL-SPEC Connector Categories & Types

Here’s a categorized reference list of the major connector series and derivative types commonly integrated into our harness assemblies:

Classic MIL-SPEC Series

MIL-DTL-38999 Series I (LJT), II (JT), III (TV)
MIL-DTL-26482 Series II
MIL-DTL-83723
MIL-DTL-5015
MIL-DTL-22992 Class L

High-Temperature & High-Power Variants

High Temperature Series Five (engine and firewall-rated)
High Power 38999 (RADSOK®, Temper-Grip, >500A capable)
High Voltage 38999 (next-gen power interfaces)

Extreme Environment / Derivative Series

Deep Space 38999 (cryogenic)
HD38999 High Density (+30% contact density)
Dualok (high-vibration applications)
Aquacon (fluid immersion, subsea)
ETV38999 (cost-sensitive applications)

Printed Circuit Board (PCB) Mount

D38999 Series I/II/III with PC Tail Contacts
D38999 PCB Hermetics (sealed and shielded)

High-Speed Data & Fiber Optics

Quadrax, Twinax, Coax, USB 3.0, HDMI, GbE
Fiber Optic using MIL-PRF-29504, ARINC 801, JSFC, MT

EMI/EMP Filtered Connectors

D38999 Series I, II, III with filtering
TVS diode and MOV versions for transient suppression

Hermetic / Sealed Connectors

Glass-to-metal and epoxy seals across D38999 Series I/II/III
AmpheSEAL High Pressure sealing

Quick Disconnect / Breakaway

Breakaway Series (MIL-STD-1760-qualified)
T-Line Push-Pull
LJT Breakaway

Miniature & Micro-Miniature Series

2M Micro 38999
Bantam Micro-Bayonet
Warrior Grip (wearable soldier systems)
MRC Multi-Media Ruggedized

Specialized Connector Options

Bulkhead Feedthroughs
Connector Savers
RoHS-Compliant Platings (AP-93, electroless nickel, etc.)
Jam Nut Styles (space-saving mount)
Integral Backshells, Dummy Receptacles, Caps

Built. Sealed. Delivered.

We specialize in transforming these standardized components into ruggedized interconnect harnesses, ready for field deployment. Whether you’re prototyping a small UAV interface or building out full vehicle architecture, our team helps configure, mold, and boot your assemblies to perform in the real world—not just on paper.

Let us know your specs—we’ll take it from there.