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GJB599 Series III Metal Shell Circular Connector
The GJB599 Series III circular connector (equivalent to MIL-DTL-38999 Series III) uses a triple-start threaded coupling with an anti-decoupling mechanism, combining fast mating with vibration-proof locking. It offers high contact density in a small, lightweight shell and is available with aluminium-alloy, stainless-steel, fire-resistant and composite shells in a range of finishes. Contacts are crimp-removable with an anti-misinsertion design, and the series is qualified for high-temperature, high-intensity vibration and harsh sand-and-moisture environments in aviation, aerospace and military systems.
Product Description & Technical Specifications
TECHNICAL DATASHEET1. Product Overview & Features
The GJB599 Series III circular connector (equivalent to MIL-DTL-38999 Series III) uses a triple-start threaded coupling with an anti-decoupling mechanism, combining fast mating with vibration-proof locking. It offers high contact density in a small, lightweight shell and is available with aluminium-alloy, stainless-steel, fire-resistant and composite shells in a range of finishes. Contacts are crimp-removable with an anti-misinsertion design, and the series is qualified for high-temperature, high-intensity vibration and harsh sand-and-moisture environments in aviation, aerospace and military systems.
- Triple-start threaded coupling with anti-decoupling mechanism for fast, vibration-proof connection.
- Compact, lightweight shells with high contact density and full EMI shielding.
- Crimp-removable, anti-misinsertion contacts in crimp, solder and PCB terminations.
- Aluminium-alloy, stainless-steel, fire-resistant and composite shell options with multiple finishes.
- Qualified for high-intensity vibration at elevated temperature, plus sand and humidity exposure.
- Meets GJB599A / MIL-DTL-38999K Series III and intermates with equivalent MIL-DTL-38999 III connectors.
2. Technical Specifications
| Executive Standard | GJB599A (MIL-DTL-38999K), Series III |
|---|---|
| Coupling Mechanism | Triple-start threaded, anti-decoupling mechanism |
| Shell Material | Aluminium alloy, stainless steel, composite |
| Shell Finish | W — cadmium, olive drab / F — electroless nickel / K — passivated stainless steel |
| 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 |
| Contact Retention | 22D# 45 N; 20# 67 N; 16# / 12# / 10# / 8# 111 N |
| Insulation Resistance | ≥ 5000 MΩ normal conditions |
| Shell-to-Shell Continuity | Class W ≤ 2.5 mΩ / Class F ≤ 1.0 mΩ / Class K ≤ 5 mΩ |
| EMI Shielding | ≥ 85 dB (100 MHz–1 GHz, W / F); ≥ 65 dB (F) and 50 dB (W) at 1–10 GHz |
| Vibration | Sine 60 g with temperature cycling and simulated accessory load (36 h); random 44.1 grms at high temperature, 49.5 grms at ambient |
| Shock | 3 ms half-sine, 300 g peak acceleration |
| Operating Temperature | Class W −65 °C to +175 °C; Class F / K −65 °C to +200 °C |
| Damp Heat | 10 cycles of 24 h per MIL-DTL-38999K |
| Fluid Resistance | Resists fuels, coolants and solvents |
| Salt Spray | Class W 500 h / Class K 1000 h / Class F 48 h (GJB1217 method 1001) |
| Dielectric Withstanding Voltage | Sea level: M 1300 V, N 1000 V, I 1800 V, II 2300 V |
| Mechanical Endurance | 500 mating cycles |
