MIL-DTL-38999 Series II Circular Connectors, Low Profile Bayonet Connectors
Low profile bayonet connector (MIL-DTL-38999 Series II) are designed for reliable performance in harsh environments with high vibration, dust, and moisture exposure. They feature a fire-resistant housing and multiple coating options for improved durability under demanding operating conditions. These low profile bayonet connectors maintain stable mechanical strength and electrical performance even in high-temperature environments and are suitable for aerospace, defense, and other rugged industrial applications.
Specifications
| Environmental | Operating Temperature | Class B: -65 °C to +175 °C Class C/E/F: -65 °C to +200 °C |
| Salt Spray | Class F: 48 hours Class C: 96 hours Class B: 500 hours Class E: 1000 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: ≥ 45 dB | |
| Dielectric Withstanding Voltage (DWV) | 1300 V @ Sea Level 800 V @ 21,000 m | |
| Insulation Resistance | Normal: ≥ 5000 MΩ Damp heat: ≥ 100 MΩ | |
| Shell-to-Shell Conductivity | Class B: ≤ 2.5 mΩ Class E: ≤ 2.5 mΩ Class F: ≤ 1.0 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) | |
| Mating cycles | 500 cycles | |
| Random Vibration | 100 to 1000 Hz, 1 g²/Hz | |
| Mechanical Shock | 300 g, 3 ms, half-sine wave | |
| Wire Accommodation | Size 22D: 28 to 22 AWG Size 20: 24 to 20 AWG Size 16: 20 to 16 AWG Size 12: 14 to 12 AWG |
Features
- MIL-DTL-38999 Series II circular connectors use a quick coupling system with an anti-loosening locking mechanism for secure mating under vibration.
- They have the smallest size, lightest weight, and shortest shell length within the D38999 connector family.
- The EMI/RFI shielding performance ensures stable signal and power transmission in electronic systems.
- Designed with removable contacts and anti-misalignment design for easier installation and reliable mating.
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.