Circular Connectors
MIL-DTL-38999 III Series
Applications
Our MIL-DTL-38999 III series circular connectors are ideal for circuit signal connections in various industries.
Environments
Our MIL-DTL-38999 III series circular connectors are designed to thrive in environments characterized by strong vibrations, heavy rain, sandstorms, and high humidity.
Introducing our advanced MIL-DTL-38999 III series connectors, engineered to meet and exceed MIL-DTL-38999 series III specifications.
General Information
- •Compliant with MIL-DTL-38999 III series standards
- •Three-start thread for fast and secure mating, equipped with anti-loosening mechanism
- •Compact size, lightweight design, and high contact density
- •Superior EMI shielding capabilities
- •Removable contacts for easy installation and anti-misinsertion features, preventing bent pins
Main Technical Information
- •Designed for high-strength vibration and harsh environmental conditions, including strong winds, sand, and humidity
- •12# and 16# contact arrangements support fiber optic contacts
- •12#, 10#, and 8# contact arrangements support coaxial and shielded contacts
Applications of Circular Connectors
Our MIL-DTL-38999 III series circular connectors are ideal for circuit signal connections in various industries.
Environments
Our MIL-DTL-38999 III series circular connectors are designed to thrive in environments characterized by strong vibrations, heavy rain, sandstorms, and high humidity.
Main Technical Performance
Environmental Performance
- •Temperature range: Class W: -65°C to +175°C; Class F, K, FT, TA: -65°C to +200°C
- •Salt spray test results: Class W: 500 hours; Class K, TA: 1000 hours; Class F: 48 hours/96 hours; Class FT: 96 hours
- •Sealing: Complies with MIL-DTL-38999M low-pressure impregnation requirements
- •Humidity resistance: According to MIL-DTL-38999M, 24 hours with 10 cycles
- •Fluid resistance: Resistant to various fuels, coolants, and solvents
Mechanical Performance of Circular Connectors
- •Shell materials: Aluminum alloy, stainless steel, titanium alloy
- •Insulator materials: Thermosetting or thermoplastic
- •Sealing material: Silicone rubber
- •Plating options: Class W: Cadmium plating; Class F: Chemical nickel plating; Class K: Stainless steel passivation; Class FT: Aluminum alloy with matte cadmium plating; Class TA: Titanium alloy
- •Contact materials: Gold-plated copper alloy, available in crimp, solder, and printed circuit board configurations
- •Mechanical lifespan: 500 mating cycles
- •Shock resistance: Withstands 3ms half-sine wave with peak acceleration up to 300g
- •Vibration resistance: Sinusoidal vibration: 60g with temperature cycling and simulated attachments (36 hours); Random vibration at high temperatures: Frequency range of 100-1000Hz, power spectral density of 1g²/Hz, corresponding to an RMS value of 41.7g; Random vibration at ambient temperature: Frequency range of 100-1000Hz, power spectral density of 5g²/Hz, corresponding to an RMS value of 48.5g
Electrical Performance
Contact resistance and current rating:
| Diameter (mm) | Resistance (mΩ) | Current (A) |
|---|---|---|
| Ø0.76 | ≤12 | 5 |
| Ø1.00 | ≤5 | 7.5 |
| Ø1.60 | ≤2.5 | 13 |
| Ø2.40 | ≤1.5 | 23 |
| Ø3.15 | ≤1.0 | 40 |
Note: Different contact arrangements have different operating levels, see top-right corner of contact arrangement label
Insulation resistance: ≥5000MΩ under normal conditions (500VDC)
Insulation resistance: ≥5000MΩ under normal conditions (500VDC)
Class W: ≤2.5mΩ
Class F, FT: ≤1.0mΩ
Class K, TA: ≤10mΩ
EMI shielding: Minimum attenuation of 85dB from 100MHz to 1GHz (Class F, Class W)
EMI shielding: Minimum attenuation of 65dB from 1GHz to 10GHz (Class F), 50dB (Class W)
8# twin coaxial contacts: Frequency bandwidth of 0-20MHz, maximum rated voltage of 500VAC, 125VAC at 21000 meters
Voltage drop: Inner and middle contacts ≤55mV at 1A, outer contacts ≤75mV at 12A
With a team of highly skilled R&D professionals and certifications in high-tech enterprise and quality management systems, Kaida exports its products to over 30 countries worldwide, earning a solid international reputation.
