D38999/24WB4PN | 4-Pin Series III Jam Nut Receptacle (Size 11)
The D38999/24WB4PN is a size 11 MIL-DTL-38999 Series III jam nut receptacle with 4 pin contacts. Features “W” olive drab cadmium finish and “N” polarization for rugged power grids.
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D38999/24WB4PN Efficiency of Single-Hole Jam Nut Mounting
The D38999/24WB4PN 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. 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.
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 Conductivity
The “W” class finish of the D38999/24WB4PN 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 four internal conductive lines from electromagnetic interference in dense electronic clusters.
Universal N-Keying and Systematic Compatibility
The D38999/24WB4PN utilizes the standard “N” (Normal) polarization keyway, providing universal intermateability with any standard-issue Series III plug of the same 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 4-pin interface remains securely engaged, providing constant electrical continuity even in high-stress aerospace and ground-vehicle environments.
Optimized Power and Signal with 11-04 Layout
Within the size 11 housing, the D38999/24WB4PN employs the 11-04 insert arrangement, providing four independent conductive channels using Size 20 pin contacts. Compared to high-density signal pins, these Size 20 contacts feature a larger cross-sectional area, allowing them to carry higher electrical currents with reduced thermal buildup. This makes the D38999/24WB4PN a versatile choice for localized power supply modules, small motor drives, or high-reliability sensor interfaces. The high-performance dielectric insert ensures superior insulation resistance, preventing electrical leakage between channels even in unpressurized aerospace compartments subject to rapid temperature fluctuations.
Mechanical Protection and Field Maintenance
The structural reliability of the D38999/24WB4PN is further supported by its 100% scoop-proof shell architecture. This design ensures that the four pin contacts are recessed deeply enough within the housing to prevent any bending or 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 pins using standard military tools without disassembling the entire unit from the panel. This combination of physical protection and modular serviceability ensures the D38999/24WB4PN provides a low total cost of ownership for mission-critical 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 pins are provided in the 11-04 layout?
How many pins are provided in the 11-04 layout?
The 11-04 layout provides four independent conductive channels using Size 20 pin contacts, offering a robust interface for medium-current power or signal 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 D38999/24WB4PN compatible with standard Series III plugs?
Is the D38999/24WB4PN compatible with standard Series III plugs?
Absolutely. As long as the mating plug is size 11, has the 04 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?
Yes, 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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