J599 Series Circular Military Connector
MIL-DTL-38999 Series III | GJB599B Standard
Product Overview
The J599 Series Circular Connector is designed in accordance with GJB599B (MIL-DTL-38999 Series III) standards. Featuring a three-start threaded quick coupling with an anti-decoupling mechanism, it delivers exceptional performance in demanding military, aerospace, naval, and industrial applications.
Its compact size, lightweight construction, high contact density, and excellent EMI shielding make it ideal for harsh operating environments where reliability is critical.
The connector supports removable crimp contacts, fiber optic contacts, coaxial contacts, and shielded contacts, providing maximum design flexibility.
Key Features
- Compliant with GJB599B / MIL-DTL-38999 Series III
- Three-start threaded quick coupling
- Anti-loosening locking mechanism
- Compact and lightweight design
- High-density contact arrangement
- Excellent EMI/RFI shielding
- Removable crimp contacts
- Polarized keying to prevent mismating
- Supports signal, power, coaxial and fiber optic contacts
- Outstanding vibration and shock resistance
- Fully sealed for harsh environments
Applications
Suitable for:
- Military Systems
- Aerospace & Avionics
- Naval Equipment
- Radar Systems
- Ground Defense Vehicles
- Communication Equipment
- Industrial Automation
- Railway Electronics
- Harsh Environment Electronics
Operating Environment
Designed for reliable operation under:
- Strong vibration
- Mechanical shock
- Rain
- Humidity
- Sand & dust
- Salt spray
- High and low temperatures
- Chemical fluids and fuels
Materials
| Component | Material |
|---|---|
| Shell | Aluminum Alloy / Stainless Steel / Titanium Alloy |
| Insulator | Thermosetting or Thermoplastic |
| Seals | Silicone Rubber |
| Contacts | Gold-Plated Copper Alloy |
Available contact terminations:
- Crimp
- Solder
- PCB
Available Surface Finishes
| Finish | Description |
|---|---|
| W | Olive Drab Cadmium Plating |
| F | Electroless Nickel |
| K | Stainless Steel Passivation |
| FT | Satin Cadmium Plated Aluminum |
| TA | Titanium Alloy |
Mechanical Performance
| Parameter | Value |
|---|---|
| Mechanical Life | ≥500 Mating Cycles |
| Shock Resistance | 300 g, 3 ms Half-Sine Pulse |
| Sine Vibration | 60 g |
| Random Vibration (High Temp.) | 41.7 g RMS |
| Random Vibration (Ambient) | 49.5 g RMS |
Electrical Performance
Withstand Voltage
| Service Class | Sea Level | 21,000 m |
|---|---|---|
| M | 1300 V | 800 V |
| N | 1000 V | 600 V |
| I | 1800 V | 1000 V |
| II | 2300 V | 1000 V |
Voltage ratings vary depending on the contact arrangement.
Contact Specifications
| Contact Size | Diameter | Contact Resistance | Rated Current |
|---|---|---|---|
| 22D | 0.76 mm | ≤12 mΩ | 5 A |
| 20 | 1.00 mm | ≤5 mΩ | 7.5 A |
| 16 | 1.60 mm | ≤2.5 mΩ | 13 A |
| 12 | 2.40 mm | ≤1.5 mΩ | 23 A |
| 10 | 3.15 mm | ≤1.0 mΩ | 40 A |
Insulation Resistance
- ≥5000 MΩ (500 VDC)
Shell Conductivity
| Finish | Conductivity |
|---|---|
| W | 2.5 mV |
| F / FT | 1.0 mV |
| K / TA | 10 mV |
EMI Shielding Performance
| Frequency Range | Shielding Effectiveness |
|---|---|
| 100 MHz – 1 GHz | ≥85 dB (Class F & W) |
| 1 GHz – 10 GHz | ≥65 dB (Class F) |
| 1 GHz – 10 GHz | ≥50 dB (Class W) |
Coaxial Contact Capability
For #8 Dual Coaxial Contacts:
- Bandwidth: 0–20 MHz
- Rated Voltage:
- 500 VAC (Sea Level)
- 125 VAC (21,000 m Altitude)
- Voltage Drop:
- Inner & Middle Contacts: ≤55 mV @ 1 A
- Outer Contact: ≤75 mV @ 12 A
Environmental Performance
| Parameter | Specification |
|---|---|
| Operating Temperature (W) | -65°C to +175°C |
| Operating Temperature (F/K/FT/TA) | -65°C to +200°C |
| Salt Spray (W) | 500 Hours |
| Salt Spray (K/TA) | 1000 Hours |
| Salt Spray (F) | 48–96 Hours |
| Salt Spray (FT) | 96 Hours |
| Moisture Resistance | MIL-DTL-38999 Standard |
| Sealing | MIL-DTL-38999 Qualified |
| Chemical Resistance | Resistant to Fuels, Hydraulic Fluids & Solvents |
Compatible Contact Types
- Signal Contacts
- Power Contacts
- Fiber Optic Contacts (Sizes 12, 16 & 20)
- Coaxial Contacts (Sizes 8, 10 & 12)
- Shielded Contacts
Product Advantages
- MIL-DTL-38999 Series III compliant
- High-density design
- Superior EMI protection
- High shock & vibration resistance
- Excellent environmental sealing
- Lightweight yet durable construction
- Long service life
- Easy maintenance with removable contacts
- Suitable for mission-critical applications
