MIL-DTL-38999 / MIL-C-38999 Series Subminiature Circular Connectors
STA offers a comprehensive portfolio of high-density MIL-DTL-38999 series connectors (formerly known as MIL-C-38999), widely recognized as the industry standard for rugged electrical and optical connections in military, aerospace, and defense applications. Engineered to operate under extreme environmental stress, our subminiature cylindrical interfaces provide maximum contact density, optional 100% scoop-proof designs, and superior EMI/RFI shielding effectiveness.
As an advanced interconnection manufacturing specialist, STA delivers definitive Cross Reference and Drop-in Replacement components. Our 38999 series is fully intermateable and interchangeable with Amphenol TV/Tri-Start Series, Souriau 8D / LT / T Series, ITT Cannon KJB, and Glenair equivalents. This enables global defense contractors, procurement managers, and wire harness OEMs to source factory-direct, high-reliability alternatives while ensuring seamless compatibility with legacy Bills of Materials (BOM).
Comprehensive Series & Military Part Number Configurations
To streamline the engineering blueprint verification and sourcing workflow, STA supports all four major standard subminiature sub-series, featuring diverse mounting styles, coupling mechanisms, and rear accessories:
- Series I (MS27466, MS27467, MS27468): Scoop-proof, rapid bayonet coupling connectors optimized for high-vibration applications requiring fast disconnection.
- Series II (MS27472, MS27473, MS27484, MS27499): Non-scoop-proof, low-profile bayonet coupling design tailored for extreme weight-saving and space-restricted electronics boxes.
- Series III / D38999 (D38999/26, D38999/24, D38999/20): The most popular class featuring a heavy-duty, self-locking quick triple-start threaded coupling mechanism, complete with metallic EMI grounding fingers.
- Series IV (MS27656, MS27662): Breech-lock coupling mechanism designed for severe-environment blind-mating or rapid-disconnect umbilical feeds.
Key Technical Features & Advanced Specifications
- Premium Contact Typology: Supports rear-release crimp contacts (pin and socket layouts), high-reliability solder tails, coax/twinax/quadrax high-speed data pins, and fiber optic (ARINC 801) terminal arrays.
- Shell Sizes & High-Density Layouts: Rugged aluminum alloy, composite, or stainless steel shells (available from size 9 to 25) supporting over 150 insert arrangements (ranging from 2 to 128 contacts per interface).
- Harsh Environment Protective Plating: Available in olive drab cadmium over electroless nickel (500-hour salt spray), RoHS-compliant black zinc nickel, or passivated stainless steel for maritime applications.
- Hermetic & Sealed Variants: Special glass sintered sealed receptacles available for ultra-high vacuum or high-gaseous-pressure bulkhead installations.
- Superior Environmental Ratings: Complete IP67 / IP68 ingress protection when properly mated, operational temperature thresholds spanning -55°C to +200°C, and continuous vibration resistance up to 60G.
High-Reliability Application Scenes
- Military Aviation & Avionics Systems: Main power feeds, flight control computers, radar systems, and cockpit instrumentation cabling.
- Defense & Ground Tactical Vehicles: Rugged communication command boxes, weapon firing control networks, and heavy-armored vehicle telemetry.
- Naval Electronics & Marine Engineering: Salt-spray resistant sonar systems, submarine hull-penetration interfaces, and offshore shipboard power distribution.
- High-Speed Commercial Rail & Heavy Industry: High-shock locomotive engine sensors, industrial multi-axis automation control centers, and high-frequency communication base stations.
Amphenol, Souriau, and ITT Cannon Cross Reference Matrix
If you are managing long supply chain lead times or looking for alternative sourcing channels, STA’s MIL-DTL-38999 components map perfectly into your catalog requirements. For example, looking for a D38999/26WB35SN alternative? Our production team provides 100% mechanical and electrical intermateability. Whether you are replacing an Amphenol TV series, Souriau 8D line, or ITT Cannon KJB plug, STA delivers audited factory inspection standards, customized wire harness assemblies, and highly competitive wholesale pricing.
Need a Custom 38999 Interconnect Solution?
Looking for a specific MIL-DTL-38999 series insert arrangement diagram, customized cable wire harness assembly, or looking to download the official product specifications PDF datasheet?
Contact STA Engineers for Custom Solutions and Instant Quotes!
