J1784/49-12W Contact | Size 12 for MIL-DTL-38999 Connectors
J1784/49-12W is a Size 12 Contact for MIL-DTL-38999 connectors. Built to SAE AS39029 standards, this gold-plated crimp contact ensures reliable power & signal.
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It is a critical component in high-reliability interconnect systems, specifically designed as a strain relief backshell for military circular connectors. As an essential part of the AVIA Connector ecosystem, this specific backshell ensures that your cable assemblies meet the rigorous demands of aerospace and defense applications.
Key Specifications
Shell Material | Voltage Rating | Current Rating | Operating Temp | Mating Cycles | Coupling |
|---|---|---|---|---|---|
Aluminum alloy | ~1000 VAC | ~40A | -65 °C to +200 °C | 500 | Threaded |
What is the J1784/49-12W Backshell?
The J1784/49-12W (often associated with M85049/49-2 standards) is a straight, strain relief cable clamp. It is engineered to protect the wire-to-connector interface from mechanical stress and environmental fatigue.
Technical Specifications of J1784/49-12W
Understanding the parameters of J1784/49-12W is vital for correct integration:
Material: High-grade Aluminum Alloy.
Finish: Olive Drab Cadmium (W finish) for superior corrosion resistance.
Shell Size: Compatible with Size 12 connectors.
Configuration: Straight Strain Relief (M85049/49 style).
Why J1784/49-12W is Essential for MIL-DTL-38999 and 26482 Series
It is frequently paired with MIL-DTL-38999 Series I & II and MIL-DTL-26482 connectors. Its primary role is to provide a robust exit point for wire bundles, ensuring that the electrical contacts inside the connector are not compromised by pulling or twisting.
1. Superior Corrosion Protection (W-Finish)
The “W” in J1784/49-12W stands for the Olive Drab Cadmium over Electroless Nickel finish. This provides 500 hours of salt spray resistance, making it perfect for the harsh maritime and industrial environments found in the Russian and Iranian markets.
2. Enhanced Mechanical Strain Relief
By utilizing the J1784/49-12W, engineers can prevent “wire-pull” failures. The two-screw clamp design firmly grips the cable jacket, distributing the load across the connector shell rather than the delicate solder or crimp joints.
Comparison: J1784/49-12W vs. Standard Cable Clamps
When comparing the J1784/49-12W to commercial-grade alternatives, the military-spec version offers tighter tolerances and better material integrity. According to official SAE AS85049 standards, these backshells are tested for extreme vibration and thermal shock, which standard clamps may fail to withstand.
Installation Guide for J1784/49-12W
Properly installing the J1784/49-12W is key to maintaining system integrity:
Slide the J1784/49-12W backshell onto the cable before terminating wires.
Terminate the contacts to the connector shell.
Thread the backshell onto the rear of the connector.
Tighten the two clamping screws evenly to secure the cable bundle.
FAQ
What is the main purpose of using a connector backshell?
What is the main purpose of using a connector backshell?
A backshell is a mechanical device that threads onto the rear of a circular connector. Its primary role is to provide strain relief, protecting the delicate internal wire terminations from physical pulling or twisting. It also helps in organizing cable bundles and, depending on the model, providing environmental sealing or EMI/RFI shielding.
How do I choose the correct shell size for my cable clamp?
How do I choose the correct shell size for my cable clamp?
Backshell sizes are designed to match the shell size of the connector they are mating with. For example, if you are using a size 12 circular connector, you must select a size 12 cable clamp. It is also crucial to verify that the cable entry diameter of the clamp can accommodate your specific wire bundle thickness.
What does an "Olive Drab Cadmium" finish offer?
What does an "Olive Drab Cadmium" finish offer?
This finish (often denoted by a “W” in military specifications) is the industry standard for harsh environments. It provides exceptional corrosion resistance—typically rated for 500 hours of salt spray—and is electrically conductive, which is essential for grounding and shielding applications in aerospace and defense.
Can I use these backshells with different connector brands?
Can I use these backshells with different connector brands?
Most military-standard backshells are designed to be “intermateable.” As long as the backshell and the connector both adhere to the same military specification (such as MIL-DTL-38999 or MIL-DTL-26482), they will function together perfectly, regardless of the manufacturer.
How can I get technical support for connector accessories?
How can I get technical support for connector accessories?
Our technical team specializes in interconnect solutions for aviation and industrial markets. If you need a cross-reference guide or a specific datasheet, simply use our live chat. We pride ourselves on efficiency and aim to provide a comprehensive response within 15 minutes.
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