Black Zinc Nickel plating

MIL-DTL-38999 Series III finished with Black Zinc Nickel plating has some real advantages over other circular connectors designed for harsh environments. This connector family is designed to survive extreme conditions where corrosion resistance, electrical performance, mechanical functionality, and aesthetics are critical. This finish not only achieves those criteria but also provides compliance with the latest EU RoHS directive.

d38999 series iii conesys

Fast Turnaround

Due to extensive piece part stocking and efficient build processes NYKCS can offer a fast turnaround of this approved product, assembled to your requirements. Contact us today for the best price and delivery on MIL-DTL-38999 Series III circular connectors​ in Black Zinc Nickel, Cadmium Olive Drab or Electroless Nickel to meet your specific project needs.

Black Zinc Nickel Plating

The fully qualified, 'Z class' is an aluminium shell with RoHS compliant Black Zinc Nickel plating.  This plating is free of Cadmium, hexavalent Chromium, Lead, and any other substances identified as hazardous by the EU, and it has now been adopted as a standard across the globe. Z class meets or exceeds all the same qualification requirements as W class (aluminium shell with olive drab cadmium over nickel plating) as per MIL-DTL-38999. This includes corrosion resistance at 500-hour salt spray rating, durability at 500 mating cycles, EMI shielding effectiveness, and shell to shell conductivity at 2.5 millivolts maximum potential voltage drop, to name a few.

Performance Specifications

  • Operating Temperature Range, Class Z: -65°C to +175°C (-85°F to +347°F);
  • Corrosion Resistance: Military Class Z withstands 500-hour salt spray;
  • Durability: Minimum of 500 mating cycles;
  • Fluid Resistance: Connectors resist specified immersions in MIL-PRF-7808, MIL-PRF-23699, MIL-PRF-5606, M2-V Chevron oil, Coolanol 25, MIL-DTL-83133 (JP-8), MIL-DTL-5624 (JP-4, JP-5), SAE-AMS1424 Type I, and other solvents and cleaning agents;
  • Shielding Effectiveness: RFI and EMI attenuation at the specified frequencies meet the requirements of MIL-DTL-38999:
    • RFI shielding effectiveness of mated connectors with RFI backshells is measured in a triaxial radio frequency leakage fixture;
    • EMI shielding effectiveness is measured at the interface of mated connectors and tested by the mode-stirred technique specified in method 3008 of MIL-STD-1344.
  • Environmental Seal: Wired, mated connectors with specified accessories attached, shall meet the altitude-immersion test specified in MIL-DTL-38999;
  • Shell-to-Shell Conductivity: Maximum potential drop shall not exceed, Class Z = 2.5 millivolts;
  • Shock and Vibration Requirements: Wired, mated connectors shall not be damaged, nor shall there be a current interruption longer than one microsecond when subjected to the following:
    • Shock Pulse of approximate half sine wave of 300 G ± 15 percent magnitude with duration of 3 ± 1 milliseconds applied in three axes;
    • High Impact Shock When mounted as specified in MIL-S-901, grade A, a drop of a 400 lb. Hammer from 1 foot, 3 feet and 5 feet applied to connector in three axes, totaling nine impacts.
    • Vibration Wired and mated connectors withstand the following vibration levels:
    • Sine vibration where connector samples with simulated accessory load are subjected to simple harmonic motion from 10 to 2,000 Hz in three mutually perpendicular axes, in 20-minute sweeps, for 12 hours in each axis at velocity of 254 mm/sec from 10-50 Hz, displacement of 1.5 mm from 50-140Hz and acceleration of 60G from 140-2,000Hz;
    • Random Vibration per MIL-STD-1344, method 2005, test condition V at ambient temperature and test condition VI, Letter “J” at elevated temperature.