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D38999/24WD35SN – TE Connectivity Circular MIL Spec Connector 37 Pin Size 15 Jam Nut Receptacle
Available now on the Airparts.aero Marketplace.
The D38999/24WD35SN is a high-density, flight-critical circular electrical connector engineered for the most demanding aerospace and defense environments. As a Part of the MIL-DTL-38999 Series III family, this Jam Nut Receptacle (Style 24) is designed to provide a robust, EMI-shielded interface for signal and power transmission in pressurized and non-pressurized zones. It features a triple-start threaded coupling mechanism that ensures rapid mating and superior vibration resistance, essential for airframe, avionics, and engine-control applications.
Manufactured by TE Connectivity (DEUTSCH), this connector utilizes a Size 15 shell with a high-density "35" insert arrangement, accommodating 37 Size 22D socket contacts. The "W" finish denotes an Olive Drab Cadmium plating over an aluminum alloy shell, providing 500 hours of salt spray resistance and excellent electrical conductivity for shell-to-shell shielding. This component is integral to the reliability of modern fly-by-wire systems and mission-critical sensor suites where signal integrity cannot be compromised.
The D38999/24WD35SN represents the industry standard for environmental sealing and mechanical durability. Its design incorporates a rear-release contact system and peripheral seals to prevent moisture ingress, ensuring long-term dielectric stability. For procurement specialists and A&P mechanics, this connector offers a field-proven solution that meets stringent NAVAIR and MIL-SPEC requirements.
Key Features
Triple-Start Threaded Coupling: Features a self-locking, anti-decoupling mechanism that prevents loosening under high-amplitude vibration or thermal cycling.
Superior EMI/RFI Shielding: The grounding fingers and cadmium plating provide high-frequency shielding effectiveness (up to 65 dB at 10 GHz).
Environmental Sealing: Equipped with a fluorosilicone interfacial seal and rear grommet to maintain IP67-rated protection against jet fuel, hydraulic fluid, and moisture.
High-Density Contact Arrangement: Utilizes 37 high-reliability, gold-plated socket contacts in a compact Size 15 envelope.
Jam Nut Mounting: The D38999/24 (Style 24) design allows for easy bulkhead mounting with a single hexagonal nut, ideal for space-constrained panels.
Technical Specifications
Part Number: D38999/24WD35SN
Component Type: Circular MIL-DTL-38999 Series III Receptacle
Manufacturer: TE Connectivity / DEUTSCH
Shell Size: 15
Insert Arrangement: 15-35 (37 Contacts)
Contact Type: Socket (S), Crimp Rear-Release
Contact Size: 22D
Polarization: Normal (N)
Material: Aluminum Alloy Shell
Finish: Olive Drab Cadmium over Electroless Nickel
Dielectric Withstanding Voltage: 1300 VAC (Sea Level)
Temperature Range: $-65^{\circ}\text{C}$ to $+175^{\circ}\text{C}$
Vibration: Sine and Random (Up to 60g)
Governing Specification: MIL-DTL-38999 Series III
Aircraft Compatibility
Fixed Wing: Boeing 737/757/787 Series, Airbus A320/A350 Family, Lockheed Martin F-16/F-35.
Rotary Wing: Sikorsky UH-60 Black Hawk, Boeing AH-64 Apache.
Engines: CFM56, V2500, and Pratt & Whitney PW4000 series (External Wire Harnesses).
Note: Always consult the specific aircraft Illustrated Parts Catalog (IPC) or Wiring Diagram Manual (WDM) for effectivity and configuration control.
Applications
Avionics Interconnects: Primary interface for Flight Management Systems (FMS) and Navigation Units.
Engine Control: Data transmission for FADEC (Full Authority Digital Engine Control) systems.
Sensors: High-density wiring for Pitot-static systems, temperature probes, and pressure transducers.
Why Choose D38999/24WD35SN?
Choosing a genuine MIL-SPEC D38999/24WD35SN ensures compliance with FAA and EASA airworthiness directives. Non-certified or "look-alike" connectors often fail at the material level, leading to galvanic corrosion or dielectric breakdown under thermal shock. By utilizing TE Connectivity’s aerospace-grade components, operators minimize the risk of intermittent signals or catastrophic "smoke in the cockpit" events caused by electrical arcing or moisture-induced shorts.
The D38999/24WD35SN utilizes advanced materials science to maintain electrical continuity across extreme environmental gradients. The shell is machined from a high-strength aluminum alloy, then subjected to a dual-layer plating process: an initial electroless nickel strike for conductivity and corrosion resistance, followed by an Olive Drab Cadmium chromate finish. This combination is essential for preventing galvanic corrosion when mated with dissimilar metals. The internal thermoplastic insert provides high dielectric strength and is designed for creepage and clearance optimization between the 37 high-density contacts. Mechanically, the Jam Nut (Style 24) configuration employs a single-hole mounting principle that utilizes an O-ring for peripheral sealing against the bulkhead, ensuring pressure integrity in pressurized vessel penetrations. The triple-start thread design incorporates a ratcheting mechanism that converts rotational torque into high axial clamping force, effectively mitigating the effects of harmonic vibration and preventing contact fretting.
Note: The D38999/24WD35SN is a flight-critical electrical component. Improper installation of crimp contacts or over-torquing the jam nut can lead to seal failure or intermittent electrical faults. Installation and wire termination must be performed by a certified A&P mechanic or avionics technician in strict accordance with the Aircraft Maintenance Manual (AMM) and AC 43.13-1B. Ensure the use of calibrated M22520/2-01 crimp tools and correct insertion/extraction tools.
