D3899-26WB99SN Circular Electrical Connector ， High Density Multi-Pin Connector ，Heavy Duty Industrial Plug ，Precision Interconnect Solution

GJB599 Series III (MIL-DTL-38999 Series III) Electrical Connector | High-Density Multi-Pin Rugged Connector | EMI Shielded

The GJB599 Series III connector conforms to GJB599B (MIL-DTL-38999M) Series III standards and is engineered for demanding industrial and mili-tary environments. It features a three-head threaded quick-connect mechanism with anti-loosening functionality. Compact and lightweight, the connector provides high contact density with electromagnetic shielding. Contacts are detachable crimp-type, and pins are designed to prevent misalignment during insertion.  

This connector demonstrates high-strength vibration performance at elevated temperatures, making it suitable for harsh sandy and humid conditions. Specific hole positions accommodate optical fiber, coaxial, and shielded contacts depending on pin specifications.  

Purpose: Circuit signal connections  

Operating Environment: Suitable for environments with strong vibrations, rain, wind, sand, and high humidity  

Materials & Mechanical Features:

• Shell: Aluminum alloy, stainless steel, titanium alloy
• Insulator: Thermosetting plastic or thermoplastic
• Sealing body & seal ring: Silicone rubber
• Surface Coatings:
  • W Class: Cadmium-plated mili-tary green
  • F Class: Chemical nickel plating
  • K Class: Stainless steel passivation
  • FT Class: Aluminum alloy satin-cadmium finish
  • TA Class: Titanium alloy
• Contact Material: Gold-plated copper alloy; available in crimped, welded, or PCB types
• Mechanical Lifespan: 500 insertion/removal cycles

Mechanical Performance:

• Impact: 3ms half-sine wave; peak acceleration 300g
• Vibration (Sine Wave): 60g, 36h temperature cycling simulation
• Vibration (Random):
  • High temperature: 100–1000 Hz, PSD 1 g²/Hz, RMS 41.7g
  • Ambient temperature: 100–1000 Hz, PSD 5 g²/Hz, RMS 49.5g

Designed for applications requiring high reliability, EMI shielding, and robust performance in extreme conditions.

Electrical Behavior

Voltage rating: V

Note: Different contact arrangements correspond to different operating grades; see the annotation in the upper-right corner of the contact arrangement for details.

Contact resistance and rated current of the contact parts:

Insulation resistance: ≥ 5000M Ω (500VDC)

Shell conductivity: W class: 2.5m Ω; F; FT class: 1.0m Ω; K; TA class: 10m Ω

Electromagnetic interference shielding: At 100 MHz to 1 GHz, the minimum attenuation is 85 dB (Class F, Class W). At 1GHz to 10GHz, the minimum attenuation is 65dB (F class) and 50dB (W class)

8# Dual coaxial contacts: Bandwidth 0–20 MHz, rated voltage: Maximum 500 VAC; at 21,000 m: 125 VAC. Voltage drop: Internal contacts and intermediate contacts ≤ 55 mV at 1 A; external contacts ≤ 75 mV at 12 A

Environmental Performance

Temperature range: W Class: -65 °C to +175 °C F, K, FT, TA categories: -65 °C to +200 °C

Salt spray resistance: W class: 500h K, TA Class: 1000h; F Class: 48h/96h; FT Class: 96h

Sealing: The plug connector complies with the MIL-DTL-38999M requirements for low-pressure impregnation.

Dampness and Heat: According to MIL-DTL-38999M: 24 hours 10 cycles

Liquid resistance: Resistant to various fuels, coolant, and solvents