MIL-DTL-38999 Series III 20FC04SN Circular Connector Flange Mount Receptacle 4-Pin Female Contacts

• Complies with GJB599B (MIL-DTL-38999M) Series III standard
• Three-head threaded quick connector with anti-loosening mechanism
• Small in volume, light in weight, and high in contact pair density
• Possesses electromagnetic shielding functionality
• The contact pieces are detachably crimped, and the pins are designed to prevent oblique insertion.
• It exhibits high-strength vibration characteristics at elevated temperatures, making it suitable for use in harsh sandy and humid environments.

The hole positions for 12# and 16# contact piece specifications are suitable for installing optical fiber contacts.

12#, 10#, 8# The hole positions for the contact specifications allow for the assembly of coaxial and shielded contact.

Purpose: The product is used for circuit signal connections.

Operating Environment: The product is designed for complex environments with strong vibrations, rain exposure, wind and sand, and high humidity.

Materials:

• Shell: Aluminum alloy, stainless steel, titanium alloy
• Insulator: Thermosetting plastic or thermoplastic
• Sealing body and seal ring: Silicone rubber

Coating:

• W Class: Cadmium-plated mili-tary green
• F Class: Chemical nickel plating
• Class K: Stainless steel passivation
• FT Class: Aluminum alloy with satin-cadmium finish
• TA Class: Titanium alloy

Contact material: Gold-plated copper alloy, available in crimped, welded, and printed circuit board types.

Mechanical lifespan: 500 insertion and removal cycles

Impact: 3ms half-sine wave; acceleration peak 300g

Vibration: Sine wave: 60g, with temperature cycling and simulation (36h)

Random:

• At high temperatures: frequency 100 to 1000 Hz, power spectral density 1 g²/Hz, corresponding root mean square value 41.7 g
• At ambient temperature: frequency range 100 to 1000 Hz, power spectral density 5 g²/Hz, corresponding root mean square value 49.5 g

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