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GJB599 Series I Circular Connector - Plug
The GJB599 Series I circular plug connector (equivalent to MIL-DTL-38999 Series I) is a bayonet-coupled, quick-connect plug built for high contact density in a small, lightweight shell. A five-key polarising system with five key positions prevents mismating, while the anti-misinsertion contact design and crimp-removable contacts simplify field assembly. The mating interface and rear grommet are sealed for excellent moisture, salt-spray, mould and sand resistance. Supplied with type T shells for standard GJB1784 backshells and shielded-cable accessories using Ti-Ni memory-ring clamps, the series is widely used in aviation, aerospace and military systems.
Product Description & Technical Specifications
TECHNICAL DATASHEET1. Product Overview & Features
The GJB599 Series I circular plug connector (equivalent to MIL-DTL-38999 Series I) is a bayonet-coupled, quick-connect plug built for high contact density in a small, lightweight shell. A five-key polarising system with five key positions prevents mismating, while the anti-misinsertion contact design and crimp-removable contacts simplify field assembly. The mating interface and rear grommet are sealed for excellent moisture, salt-spray, mould and sand resistance. Supplied with type T shells for standard GJB1784 backshells and shielded-cable accessories using Ti-Ni memory-ring clamps, the series is widely used in aviation, aerospace and military systems.
- Bayonet quick-coupling mechanism for fast, reliable mating in confined spaces.
- Compact, lightweight shells with high contact density — 9 shell sizes and 70 contact arrangements.
- EMI/RFI shielded; 5-key polarising system with five key positions to prevent mismating.
- Crimp-removable, anti-misinsertion contacts in crimp, solder and PCB terminations.
- Sealed mating interface and rear grommet for moisture, salt-spray, mould, rain and dust resistance.
- Accepts GJB1784 standard backshells and shielded-cable accessories with Ti-Ni memory-ring clamps.
2. Technical Specifications
| Executive Standard | GJB599A (MIL-DTL-38999K), Series I |
|---|---|
| Coupling Mechanism | Bayonet, quick connect / disconnect |
| Shell Material | Aluminium alloy, stainless steel |
| Shell Finish | B — cadmium, olive drab / E — stainless steel passivated / F — electroless nickel |
| Insulator | Thermosetting plastic |
| Grommet & Seals | Silicone rubber |
| Contact Material | Copper alloy, gold plated; crimp, solder and PCB types |
| Contact Sizes | 22D (φ0.76 mm), 20 (φ1.00), 16 (φ1.60), 12 (φ2.40), 10 (φ3.15), 8 (φ3.60) |
| Rated Current | 5 A / 7.5 A / 13 A / 23 A / 40 A / 46 A by contact size |
| Contact Resistance | ≤ 12 / ≤ 5 / ≤ 2.5 / ≤ 1.5 / ≤ 1.0 / ≤ 0.57 mΩ by contact size |
| Insulation Resistance | ≥ 5000 MΩ normal; ≥ 100 MΩ after damp heat |
| Dielectric Withstanding Voltage | Sea level: M 1300 V, N 1000 V, I 1800 V, II 2300 V; at 21,000 m: 800 / 600 / 1000 / 1000 V |
| Shell-to-Shell Continuity | Class B ≤ 2.5 mΩ / Class F ≤ 1.0 mΩ / Class E ≤ 5 mΩ |
| EMI/RFI Shielding | ≥ 85 dB (100 MHz–1 GHz); ≥ 50 dB (1–10 GHz) |
| Vibration | Sine 10–2000 Hz at 294 m/s²; random 100–1000 Hz, 1 g²/Hz |
| Shock | 3 ms half-sine, 300 g peak acceleration |
| Operating Temperature | Class B −65 °C to +175 °C; Class E / F −65 °C to +200 °C |
| Salt Spray | Class B 500 h / Class E 1000 h / Class F 48 h (GJB1217 method 1001) |
| Relative Humidity | Up to 98% at +40 °C |
| Operating Altitude | ≤ 30,480 m |
| Mechanical Endurance | 500 mating cycles |
