MIL-DTL-38999 Series I Circular Connectors, Bayonet-Lock Connectors
MIL-DTL-38999 Series I circular connectors use a bayonet-style locking system that allows quick mating while keeping the connection secure during vibration. Their compact structure features high contact density with effective EMI/RFI shielding, which is suitable for stable signal and power transmission in harsh operating conditions.
These mil spec are available with various contact types, including crimp and solder versions, with removable crimp contacts to ensure easier maintenance. They are also available with different mounting styles to fit different installation needs, along with multiple shell sizes and plating options depending on the application.
Specifications
| Environmental | Operating Temperature | Class B: -65 °C to +175 °C Class C/E/F: -65 °C to +200 °C |
| Salt Spray | Class B/E: 500 hours Class F: 48 hours | |
| Relative Humidity | 98% RH @ 40 °C | |
| Electrical | Current Rating & Contact Resistance | Size 22D (ø 0.76): 5 A, ≤ 12 mΩ Size 20 (ø 1.0): 7.5 A, ≤ 5 mΩ Size 16 (ø 1.6): 13 A, ≤ 2.5 mΩ Size 12 (ø 2.4): 23 A, ≤ 1.5 mΩ Size 10 (ø 3.15): 40 A, ≤ 1.0 mΩ |
| EMI Shielding | 100 MHz to 1 GHz: ≥ 85 dB 1 GHz to 10 GHz: ≥ 50 dB | |
| Dielectric Withstanding Voltage (DWV) | 1300 V @ Sea Level 800 V @ 21,000 m | |
| Insulation Resistance | Normal: ≥ 50,000 MΩ Damp heat: ≥ 100 MΩ | |
| Shell-to-Shell Conductivity | Class B: ≤ 2.5 mΩ Class F: ≤ 1.0 mΩ Class E: ≤ 5.0 mΩ | |
| Mechanical | Shell Material | Aluminum Alloy / Stainless Steel |
| Plating | Class B: Olive Drab Cadmium Class C: Anodized Class E: Passivated Class F: Electroless Nickel | |
| Insulator | PBT / Thermosetting Plastic | |
| Seals | Silicone Rubber | |
| Contacts | Copper alloy, gold plated (crimp, solder, PCB tail) | |
| Mating cycles | 500 cycles | |
| Vibration | Sine: 10 to 2000 Hz, 294 m/s² Random: 100 to 1000 Hz, 1 g²/Hz | |
| Mechanical Shock | 300 g, 3 ms |
Features
- Bayonet coupling with anti-loosening locking structure to provide secure mating under vibration
- Compact design with high contact density and effective EMI/RFI shielding
- Anti-misalignment protection to prevent incorrect mating during installation
- Crimp and solder contact options with removable crimp contacts for easier maintenance
- Compatible with GJB1784A-standard backshell accessories for shielded termination
- Multiple mounting styles, shell sizes, and plating options for different system requirements
- IP65 protection with resistance to vibration, temperature variation, and salt spray environments
High Wood works with customers across Asia, Europe, the Americas, and other international markets, building long-term partnerships with more than 200 companies worldwide, including Klemsan (Turkey), CPE (Italy), and SUNGJIN (Korea). Backed by over 10 years of experience in the connector industry, we have an R&D team that focuses on practical engineering work, from electrical connector design and structural optimization to detailed drawings, helping customers move smoothly from development to mass production.