J1784 Backshells for 38999-Type Connectors
Straight and 90° · cable clamp 2.49–21.67 mm · 360° shield termination
J599G 38999 Series III-Type Connectors with Audible Full-Mate Indication
Full-mate indication by feel and sound · shell sizes 9–25 · hermetic versions
J599G keeps the GJB 599 Series III performance and triple-start thread, and adds a coupling mechanism that tells the installer the connector is fully mated without looking. When the plug reaches its end position the coupling nut slips with a ratchet-like metallic click — useful in tight, dark or blind locations where coupling cannot be checked by eye.
- Coupling
- Triple-start thread, anti-decoupling
- Mate indication
- Slip and audible click at full mate
- Shell sizes
- 9 to 25
- Contact sizes
- 26 to 10 (2–33 A)
- Temperature
- −65 to +200 °C
- Mating cycles
- 500
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Key features
- Full-mate indication: the coupling nut slips with a metallic click once the plug is fully seated
- Meets the GJB 599 Series III performance requirements; uses the J599 Series III insert arrangements
- Blind mating, scoop-proof, EMI/RFI shielded
- Square-flange and jam-nut receptacles, plugs, and hermetic receptacles (flange, jam-nut, solder and weld mount)
- Aluminum, stainless-steel or titanium shells; rated for acid salt spray, acid atmosphere and mold
- Crimp or solder terminations; fluorosilicone (oil-resistant) seals on request
Specifications
| Parameter | Value | Condition |
|---|---|---|
| Withstanding voltage, service rating M | 1300 Vrms / 800 Vrms | Sea level / 21,000 m, mated |
| Withstanding voltage, service rating N | 1000 Vrms / 600 Vrms | Sea level / 21,000 m, mated |
| Withstanding voltage, service rating I | 1800 Vrms / 1000 Vrms | Sea level / 21,000 m, mated |
| Withstanding voltage, service rating II | 2300 Vrms / 1000 Vrms | Sea level / 21,000 m, mated |
| Insulation resistance | ≥ 5000 MΩ | 500 VDC |
| Parameter | Value | Condition |
|---|---|---|
| Coupling | Triple-start thread with full-mate slip indication | |
| Durability | 500 mating cycles | |
| Shock | 2940 m/s² | |
| Sine vibration | 10–2000 Hz, 60 g (140–2000 Hz), 12 h per axis | Temperature cycling |
| Random vibration | 50–2000 Hz, 1 g²/Hz (100–2000 Hz), 8 h per axis | Maximum temperature |
| Random vibration | 25–2000 Hz, 5 g²/Hz (100–300 Hz), 8 h per axis | Ambient temperature |
| Parameter | Value | Condition |
|---|---|---|
| Operating temperature | −65 to +200 °C | −65 to +175 °C with cadmium finish |
| Damp heat | 10 cycles of 24 h | |
| Altitude | ≤ 30,480 m | |
| Hermetic receptacles, leak rate | Tested to your requirements | |
| Marine environment | Acid salt spray, acid atmosphere and mold |
GJB 599 Series III — Performance to GJB 599 Series III, the Chinese counterpart of MIL-DTL-38999 Series III.
Parameters not listed above — for example vibration level, leak rate or other environmental tests — can be tested to your requirements, including third-party testing.
J599G/20 square-flange receptacle dimensions
| Shell | Code | Thread A | Ø B (mm) | L1 (mm) | L2 (mm) | L3 (mm) | Ø H (mm) |
|---|---|---|---|---|---|---|---|
| 9 | A | M12 × 1-6g | 17.28 | 15.09 | 18.26 | 23.8 | 3.25 |
| 11 | B | M15 × 1-6g | 20.45 | 18.26 | 20.62 | 26.2 | 3.25 |
| 13 | C | M18 × 1-6g | 23.63 | 20.62 | 23.01 | 28.6 | 3.25 |
| 15 | D | M22 × 1-6g | 26.8 | 23.01 | 24.61 | 31 | 3.25 |
| 17 | E | M25 × 1-6g | 31.56 | 24.61 | 26.97 | 33.3 | 3.25 |
| 19 | F | M28 × 1-6g | 33.15 | 26.97 | 29.36 | 36.5 | 3.25 |
| 21 | G | M31 × 1-6g | 36.13 | 29.36 | 31.75 | 39.7 | 3.25 |
| 23 | H | M34 × 1-6g | 39.5 | 31.75 | 34.93 | 42.9 | 3.91 |
| 25 | J | M37 × 1-6g | 42.68 | 34.93 | 38.1 | 46 | 3.91 |
J599G/24 jam-nut receptacle dimensions
| Shell | Code | Thread A | Ø B (mm) | Mounting thread C | L1 (mm) | L2 (mm) | W (mm) |
|---|---|---|---|---|---|---|---|
| 9 | A | M12 × 1-6g | 30.2 | M17 × 1-6g | 27 | 16.53 | 2.5 |
| 11 | B | M15 × 1-6g | 34.9 | M20 × 1-6g | 31.8 | 19.07 | 2.5 |
| 13 | C | M18 × 1-6g | 38.1 | M25 × 1-6g | 34.9 | 23.82 | 2.5 |
| 15 | D | M22 × 1-6g | 41.3 | M28 × 1-6g | 38.1 | 26.97 | 2.5 |
| 17 | E | M25 × 1-6g | 44.5 | M32 × 1-6g | 41.3 | 30.15 | 2.5 |
| 19 | F | M28 × 1-6g | 49.2 | M35 × 1-6g | 46 | 33.32 | 3.3 |
| 21 | G | M31 × 1-6g | 52.4 | M38 × 1-6g | 49.2 | 36.5 | 3.3 |
| 23 | H | M34 × 1-6g | 55.6 | M41 × 1-6g | 52.4 | 39.67 | 3.3 |
| 25 | J | M37 × 1-6g | 58.7 | M44 × 1-6g | 55.6 | 42.85 | 3.3 |
Versions
| Series code | Version | Notes |
|---|---|---|
| J599G/20 | Square-flange receptacle | |
| J599G/24 | Jam-nut receptacle | -A: double jam nut |
| J599G/26 | Plug | -U: left-hand plug (pin version) |
| J599G/21, /23, /25, /27 | Hermetic receptacles: square flange, jam nut, solder mount, weld mount | Solder pin contacts; stainless (Y) or titanium (TA) |
Shell materials and finishes
| Code | Shell material | Finish | Shell conductivity | EMI shielding | Temperature | Salt spray |
|---|---|---|---|---|---|---|
| W | Aluminum alloy | Olive-drab cadmium | 2.5 mΩ | 50 dB at 10 GHz | −65 to +175 °C | Acid salt spray rated |
| K | Stainless steel | Passivated | 10 mΩ | 45 dB at 10 GHz | −65 to +200 °C | Acid salt spray rated |
| TA | Titanium alloy | None | 10 mΩ | 65 dB at 10 GHz | −65 to +200 °C | Acid salt spray rated |
| Y | Stainless steel (hermetic) | Electropolished | — | — | −65 to +200 °C | Acid salt spray rated |
Contact sizes and current ratings
| Contact size | Engaging diameter | Contact resistance | Contact resistance (hermetic) | Current rating | Wire size |
|---|---|---|---|---|---|
| 26 | 0.508 mm | ≤ 26 mΩ | — | 2 A | — |
| 22D | 0.76 mm | ≤ 14.6 mΩ | ≤ 28 mΩ | 5 A | — |
| 20 | 1.02 mm | ≤ 7.3 mΩ | ≤ 12.0 mΩ | 7.5 A | — |
| 16 | 1.58 mm | ≤ 3.7 mΩ | ≤ 8.5 mΩ | 13 A | — |
| 12 | 2.41 mm | ≤ 1.83 mΩ | ≤ 5 mΩ | 23 A | — |
| 10 | 3.20 mm | ≤ 1 mΩ | — | 33 A | — |
How to order
J599G/[type] M [finish][shell][arrangement][contact][key][termination][options]
Example: J599G/20MKB35ZN — Square-flange receptacle, marine environment, stainless steel, shell 11, arrangement 11-35, pin contacts, key N, crimp
| Code segment | Options |
|---|---|
| Type | |
| Class | |
| Finish | |
| Shell | |
| Arrangement | |
| Contact | |
| Key | |
| Termination |
Options: -U left-hand plug; C1 fluorosilicone (oil-resistant) seals; -A double jam nut (type 24 and 23).
Cadmium finish W is not RoHS compliant and is supplied on request.
Typical applications
- Equipment racks and cabinets with rear-side connections
- Marine and offshore equipment
- Rail vehicles
- Industrial machinery with blind-mate panels
Frequently asked questions
How does the full-mate indication work?
Push the plug in and turn the coupling nut clockwise. The triple-start thread draws the plug home; when it can travel no further the nut slips with a ratchet-like metallic click, so you know by feel and sound that the connector is fully mated.
Does J599G use the standard Series III insert arrangements?
Yes — J599G uses the J599 Series III arrangements. Tell us the arrangement and we will confirm availability.
Related series
J599 Series III Circular Connectors (38999 Series III Type)
38999 Series III type · shell sizes 9–25 · 184 insert arrangements
Protective Caps for 38999-Type Plugs and Receptacles
Plug and receptacle caps · shells 8–25 · chain, cable or cord lanyard
J599HR High-Vibration 38999 Series III-Type Plugs
400 g shock · 1.5 g²/Hz random vibration · 1000 mating cycles
From sample to production
Send your requirements
Part number, drawing, pin-out or a short description of your application.
Configuration and quote
Our engineers match the configuration and reply with a drawing and quotation.
Samples
Samples are built to order. The minimum order quantity is 10 pieces, and samples and production orders each take 4–8 weeks. Third-party testing to your specification is available on request.
Your approval
You test the samples in your own equipment and approve them.
Series production
Production follows the approved sample configuration, with machining, molding, plating and assembly in our own Shenyang factory.
Need a quote or a drawing?
Send your part number, pin-out or drawing. Every inquiry is acknowledged by email within 1 business day, and an engineer follows up with a matched configuration, drawing or quotation.
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