D38999/24WB5SN | 5-Socket Series III Jam Nut Receptacle (Size 11)
The D38999/24WB5SN is a size 11 MIL-DTL-38999 Series III jam nut receptacle with 5 socket contacts. Features “W” olive drab cadmium finish and “N” polarization for rugged electronic grids.
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D38999/24WB5SN Efficiency of Single-Hole Jam Nut Mounting
The D38999/24WB5SN is a precision-engineered interconnect solution designed for specialized electronic grids where assembly efficiency and panel space conservation are paramount. Unlike the four-hole square flange models, this Type 24 jam nut receptacle requires only a single D-shaped hole for installation. This design significantly reduces the machining complexity of equipment bulkheads and minimizes potential ingress points for environmental contaminants such as moisture or dust. The use of a single high-torque hex nut to secure the connector ensures a stable and permanent mount, making it an ideal choice for compact avionics boxes and portable tactical devices where every millimeter of panel real estate is critical for system density.
Key Specifications
Shell Material | Voltage Rating | Current Rating | Operating Temp | Ingress Protection | Mating Cycles | Keying & Polarization | Coupling |
|---|---|---|---|---|---|---|---|
Aluminum alloy | ~1000 VAC | ~23 A | -65 °C to +200 °C | IP67 | 500 | N | threaded coupling |
Tactical Environmental Defense and Surface Conductivity
The “W” class finish of the D38999/24WB5SN represents a high-strength aluminum alloy housing treated with olive drab cadmium over an electroless nickel underplate. This multi-layered defense system is specifically engineered for the most aggressive field environments, providing a certified 500-hour salt spray rating. Beyond its superior corrosion resistance, the cadmium finish is highly conductive, ensuring an excellent low-impedance ground path between the shell and the equipment chassis. This conductivity is essential for maintaining effective EMI and RFI shielding, protecting the five internal signal lines from electromagnetic interference in dense electronic clusters or high-frequency communication zones.
Universal N-Keying and Secure System Integration
The D38999/24WB5SN utilizes the standard “N” (Normal) polarization keyway, providing universal intermateability with any standard-issue Series III plug of the same shell size and arrangement. For engineers designing global hardware platforms, the “N” indexing offers a predictable and reliable mating experience, facilitating easier procurement and maintenance across international supply chains. The triple-start threaded coupling mechanism provides a self-locking connection that is inherently resistant to loosening under severe harmonic vibration. This ensures that the 5-pin interface remains securely engaged, providing constant electrical continuity even during the high-stress phases of flight or heavy machinery operations.
Optimized Signal Fidelity and 11-05 Layout Integrity
Within the size 11 housing, the D38999/24WB5SN employs the 11-05 insert arrangement, providing five independent conductive channels using Size 20 socket contacts. The socket design provides a secure female interface that protects the internal electrical connection from external contamination and mechanical shock. These contacts are precision-machined and finished with high-grade gold plating to maintain a low-resistance electrical interface throughout the equipment’s service life. The high-performance dielectric insert ensures superior insulation resistance, preventing electrical leakage between channels even in unpressurized aerospace compartments subject to rapid temperature fluctuations and atmospheric changes.
Mechanical Protection and Field Maintenance
The structural reliability of the D38999/24WB5SN is further supported by its 100% scoop-proof shell architecture. This design ensures that the five socket contacts are recessed deeply enough within the housing to prevent any damage if the mating plug is misaligned or tilted during the connection process. For long-term field support, the receptacle utilizes a rear-release crimp contact system, allowing maintenance technicians to install or replace individual sockets using standard military tools without disassembling the entire unit from the panel. This combination of physical protection and modular serviceability ensures the D38999/24WB5SN provides a low total cost of ownership for mission-critical electronic grids.
FAQ
What are the benefits of the jam nut (Type 24) mounting style?
What are the benefits of the jam nut (Type 24) mounting style?
Jam nut mounting simplifies panel preparation by requiring only a single hole, and it provides a secure, high-torque attachment that is ideal for compact and weight-sensitive equipment.
How many contacts are provided in the 11-05 layout?
How many contacts are provided in the 11-05 layout?
The 11-05 layout provides five independent conductive channels using Size 20 socket contacts, offering a versatile interface for signal and low-power transmission.
Does the Olive Drab Cadmium finish provide EMI shielding?
Does the Olive Drab Cadmium finish provide EMI shielding?
Yes, the “W” finish is highly conductive, facilitating a reliable low-impedance ground path between the shell and the chassis for superior electromagnetic interference suppression.
Is the D38999/24WB5SN compatible with standard Series III plugs?
Is the D38999/24WB5SN compatible with standard Series III plugs?
Absolutely. As long as the mating plug is size 11, has the 05 layout, and uses standard “N” polarization, it will be fully intermateable with this receptacle.
Can this connector handle high-vibration aerospace use?
Can this connector handle high-vibration aerospace use?
Absolutely. The self-locking triple-start threads and the secure jam nut mounting are specifically engineered to maintain electrical and mechanical integrity under extreme vibration and shock.
Certification
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