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
| Job Level* | M | N | I | II |
|---|---|---|---|---|
| Sea Level | 1300 | 1000 | 1800 | 2300 |
| 21000m | 800 | 600 | 1000 | 1000 |
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:
| Contact Specifications | Working diameter mm | Contact resistance m Ω | Rated current A |
|---|---|---|---|
| 22D | Φ0.76 | ≤12 | 5 |
| 20# | Φ1.00 | ≤5 | 7.5 |
| 16# | Φ1.60 | ≤2.5 | 13 |
| 12# | Φ2.40 | ≤1.5 | 23 |
| 10# | Φ3.15 | ≤1.0 | 40 |
Insulation resistance: ≥ 5000M Ω (500VDC)
Shell conductivity:
- W class: 2.5m Ω
- F;FT class: 1.0m Ω
- K;TA class: 10m Ω
J599/20 Square Flange Receptacle
| Shell Size | MS Shel Size | A max | B max | C max | Thread D | E | F | G | H | J | d1 min | d2 min |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 9 | A | 20.9 | 10.8 | 2.5 | M12*1.0-6g | 23.8 | 18.26 | 15.09 | 3.25 | 5.49 | 16.66 | 13.11 |
| 11 | B | 20.9 | 10.8 | 2.5 | M15*1.0-6g | 26.2 | 20.62 | 18.26 | 3.25 | 4.93 | 20.22 | 15.88 |
| 13 | C | 20.9 | 10.8 | 2.5 | M18*1.0-6g | 28.6 | 23.01 | 20.62 | 3.25 | 4.93 | 23.42 | 19.05 |
| 15 | D | 20.9 | 10.8 | 2.5 | M22*1.0-6g | 31.0 | 24.61 | 23.01 | 3.25 | 4.39 | 26.59 | 23.01 |
| 17 | E | 20.9 | 10.8 | 2.5 | M25*1.0-6g | 33.3 | 26.97 | 24.61 | 3.25 | 4.93 | 30.96 | 25.81 |
| 19 | F | 20.9 | 10.8 | 2.5 | M28*1.0-6g | 36.5 | 29.36 | 26.97 | 3.25 | 4.93 | 32.94 | 28.98 |
| 21 | G | 20.1 | 11.5 | 3.2 | M31*1.0-6g | 39.7 | 31.75 | 29.36 | 3.25 | 4.93 | 36.12 | 32.16 |
| 23 | H | 20.1 | 11.5 | 3.2 | M34*1.0-6g | 42.9 | 34.93 | 31.75 | 3.91 | 6.15 | 39.29 | 34.93 |
| 25 | J | 20.1 | 11.5 | 3.2 | M37*1.0-6g | 46.0 | 38.10 | 34.93 | 3.91 | 6.15 | 42.47 | 37.69 |
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.