J599-20WJ35SB Circular Military Connector
Product Overview
The J599-20WJ35SB is a MIL-DTL-38999 Series III (GJB599B) high-density circular receptacle designed for demanding military, aerospace, railway, marine, and industrial applications. Featuring 128 female socket contacts, a three-start threaded coupling, and cadmium-plated aluminum shell, this connector provides exceptional electrical reliability, EMI protection, and environmental sealing in harsh operating conditions.
Key Features
- Fully compliant with GJB599B (MIL-DTL-38999 Series III)
- Three-start threaded quick coupling with anti-loosening mechanism
- High-density 128-contact arrangement
- Female socket contacts
- Removable crimp contacts for easy maintenance
- Excellent EMI/RFI shielding
- Anti-misalignment keying
- Compact and lightweight design
- Resistant to vibration, shock, moisture, sand, and dust
- Compatible with signal, coaxial, shielded, and fiber optic contacts
Applications
- Military communication systems
- Aerospace & avionics
- Naval electronics
- Radar systems
- Industrial automation
- Railway signaling
- Defense vehicles
- Harsh-environment electronic equipment
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | J599-20WJ35SB |
| Series | J599 |
| Standard | GJB599B (MIL-DTL-38999 Series III) |
| Connector Type | Wall Mount Receptacle |
| Contact Arrangement | 128 Contacts |
| Contact Type | Female Socket |
| Shell Finish | W Type – Cadmium Plating (Military Green) |
| Termination | Crimp |
| Coupling Style | Three-Start Threaded |
| Locking | Anti-Loosening |
Materials
| Component | Material |
|---|---|
| Shell | Aluminum Alloy, Stainless Steel or Titanium Alloy |
| Insulator | Thermosetting or Thermoplastic |
| Sealing | Silicone Rubber |
| Contacts | Gold-Plated Copper Alloy |
Mechanical Performance
| Parameter | Value |
|---|---|
| Mating Cycles | ≥500 |
| Shock | 300 g / 3 ms |
| Sine Vibration | 60 g |
| Random Vibration | Up to 49.5 g RMS |
Electrical Performance
Insulation Resistance
- ≥5000 MΩ @ 500 VDC
Contact Ratings
| 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 |
Withstanding Voltage
| Service Rating | 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.
EMI Shielding Performance
| Frequency | Shielding Effectiveness |
|---|---|
| 100 MHz – 1 GHz | ≥85 dB (Class W/F) |
| 1 GHz – 10 GHz | ≥50 dB (Class W), ≥65 dB (Class F) |
Environmental Performance
| Parameter | Specification |
|---|---|
| Operating Temperature | -65°C to +175°C (W Type) |
| Salt Spray Resistance | 500 Hours |
| Moisture Resistance | MIL-DTL-38999 Compliant |
| Sealing | Low-pressure immersion compliant |
| Fluid Resistance | Resistant to fuels, coolants, lubricants, and industrial solvents |
Contact Compatibility
Supports installation of:
- Signal contacts
- Fiber optic contacts (#12, #16, #20)
- Coaxial contacts (#8, #10, #12)
- Shielded contacts
Product Advantages
- Military-grade reliability
- High-density 128-contact configuration
- Excellent EMI/RFI protection
- Superior vibration and shock resistance
- Rugged environmental sealing
- Lightweight aluminum alloy construction
- Easy installation and maintenance
- Long service life in harsh environments
