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J599 Series III square-flange receptacle, jam-nut receptacle and plugs
Square-flange and jam-nut receptacles and plugs (representative image)
J599 Series III square-flange receptacle with contact insert, filter versionJ599 Series III marine-environment square-flange receptacle and plug

J599 Series III Circular Connectors (38999 Series III Type)

38999 Series III type · shell sizes 9–25 · 184 insert arrangements

J599 Series III is our 38999 Series III-type circular connector: triple-start threaded coupling with anti-decoupling, high contact density and EMI shielding. It is built to GJB 599B Series III and available in aluminum, stainless-steel, composite, titanium and hermetic versions.

Coupling
Triple-start thread
Shell sizes
9 to 25
Insert arrangements
184
Contact sizes
26 to 10 (2–33 A)
Temperature
−65 to +200 °C
Mating cycles
500 (1500 option)

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Key features

  • Triple-start threaded coupling with anti-decoupling device, scoop-proof and keyed (six key positions)
  • Built to GJB 599B Series III, the Chinese counterpart of MIL-DTL-38999 Series III
  • Nine shell materials and finishes, including composite (2000 h salt spray) and titanium
  • Hermetic receptacles with leak rate ≤ 1 × 10⁻⁸ Pa·m³/s
  • High-temperature (260 °C) versions, fluorosilicone (oil-resistant) seals and thermocouple contacts
  • Crimp contacts from size 26 to size 10, plus coax, shielded and twinax contacts
  • Marine-environment (M) versions in stainless steel, titanium or composite for exposed marine locations

Specifications

Electrical
ParameterValueCondition
Dielectric withstanding voltage, service rating M1300 Vrms / 800 VrmsSea level / 21,000 m altitude, mated
Dielectric withstanding voltage, service rating N1000 Vrms / 600 VrmsSea level / 21,000 m altitude, mated
Dielectric withstanding voltage, service rating I1800 Vrms / 1000 VrmsSea level / 21,000 m altitude, mated
Dielectric withstanding voltage, service rating II2300 Vrms / 1000 VrmsSea level / 21,000 m altitude, mated
Insulation resistance≥ 5000 MΩ500 VDC
Shell-to-shell conductivity1–10 mΩDepends on finish — see finish table
EMI shielding45–65 dB at 10 GHz; ≥ 85 dB at 1 GHzDepends on finish — see finish table
Mechanical
ParameterValueCondition
CouplingTriple-start thread, self-locking
Durability500 mating cycles1500 cycles with H/J contacts (composite shells)
Shock2940 m/s²
Environmental
ParameterValueCondition
Operating temperature−65 to +200 °C−65 to +175 °C for cadmium and T finishes; 260 °C with MT high-temperature version
Sine vibration10–2000 Hz, 60 g (140–2000 Hz), 3 × 12 hWith temperature cycling
Random vibration50–2000 Hz, 1 g²/Hz (100–2000 Hz), 2 × 8 hAt maximum temperature
Random vibration25–2000 Hz, 5 g²/Hz (100–300 Hz), 2 × 8 hAt ambient temperature
Humidity10 cycles of 24 h
Salt spray48 to 2000 hDepends on finish — see finish table
Hermetic leak rate≤ 1 × 10⁻⁸ Pa·m³/sHermetic receptacles, 0.1 MPa pressure differential

GJB 599B Series III — Chinese specification for Series III threaded circular connectors, the counterpart of MIL-DTL-38999 Series III.

Values not listed above — for example vibration level, leak rate or other environmental tests — can be tested to your requirements, including third-party testing. Specifications are subject to change; contact us for the current datasheet.

Versions

Series codeVersionNotes
J599/20Square-flange receptacleCrimp contacts
J599/24Jam-nut receptacleCrimp contacts
J599/26PlugCrimp contacts; -U suffix for the reverse-side plug
J599/21Square-flange hermetic receptacleSolder-sealed pin contacts
J599/23Jam-nut hermetic receptacle
J599/25Solder-mount hermetic receptacle
J599/27Weld-mount hermetic receptacle
J599/20…C, J599/24…CHermetic feed-through (bulkhead) receptaclesMate with a standard plug on one side and a -U plug on the other; C8 for extended contacts
J599/…MMarine-environment version (M)Stainless (K), titanium (TA) or composite shells, including hermetic, bulkhead feed-through and PCB receptacles; rated for acid salt spray, acid atmosphere and mould. Example: J599/20MKB35PN.

Shell materials and finishes

CodeShell materialFinishShell conductivityEMI shieldingTemperatureSalt spray
FAluminum alloyNickel1 mΩ≥ 65 dB at 10 GHz, ≥ 85 dB at 1 GHz−65 to +200 °C48 h
WAluminum alloyOlive-drab cadmium2.5 mΩ50 dB at 10 GHz−65 to +175 °C500 h
TAluminum alloyNickel-PTFE2.5 mΩ50 dB at 10 GHz−65 to +175 °C500 h
KStainless steelPassivated10 mΩ45 dB at 10 GHz−65 to +200 °C500 h
SStainless steelNickel1 mΩ≥ 65 dB at 10 GHz, ≥ 85 dB at 1 GHz−65 to +200 °C48 h
MCompositeNickel3 mΩ≥ 65 dB at 10 GHz, ≥ 85 dB at 1 GHz−65 to +200 °C2000 h
JCompositeOlive-drab cadmium3 mΩ≥ 50 dB at 10 GHz−65 to +175 °C2000 h
YStainless steel (hermetic)Electropolished10 mΩ45 dB at 10 GHz−65 to +200 °C500 h
TATitanium alloyNone10 mΩ≥ 65 dB at 10 GHz−65 to +200 °C500 h

Contact sizes and current ratings

Contact sizeEngaging diameterContact resistanceContact resistance (hermetic)Current ratingWire size
260.508 mm≤ 26 mΩ—2 A—
22D0.76 mm≤ 14.6 mΩ≤ 28 mΩ5 AAWG 22–26 (0.13–0.33 mm²)
201.02 mm≤ 7.3 mΩ≤ 12.0 mΩ7.5 AAWG 20–24 (0.20–0.52 mm²)
161.58 mm≤ 3.7 mΩ≤ 8.5 mΩ13 AAWG 16–20 (0.52–1.31 mm²)
122.41 mm≤ 1.83 mΩ≤ 5 mΩ23 AAWG 12–14 (2.08–3.31 mm²)
103.20 mm≤ 1 mΩ—33 AAWG 10 (5.26 mm²)

How to order

J599/ [type] [class] [finish] [shell] [arrangement] [contact] [key] [-suffix]

Example: J599/20WB35SN — Square-flange receptacle, olive-drab cadmium, shell B (size 11), arrangement 11-35, crimp socket contacts, key position N

Code segmentOptions
Type
  • 20 Square-flange receptacle
  • 24 Jam-nut receptacle
  • 26 Plug
  • 21 / 23 / 25 / 27 Hermetic receptacle: square flange / jam nut / solder mount / weld mount
Class
  • (none) Standard
  • MT High temperature, 260 °C (stainless steel only)
Finish
  • F, W, T Aluminum alloy — nickel, olive-drab cadmium, nickel-PTFE
  • K, S Stainless steel — passivated, nickel
  • M, J Composite — nickel, olive-drab cadmium
  • Y, N Stainless steel hermetic — electropolished, nickel
  • TA Titanium alloy
Shell
  • A B C D E F G H J Shell size 9, 11, 13, 15, 17, 19, 21, 23, 25
Arrangement
  • e.g. 35 See the insert arrangement table below
Contact
  • P / S Pin / socket (crimp)
  • H / J Pin / socket, 1500 mating cycles (composite shells)
  • P Solder-sealed pin (hermetic receptacles)
  • C Feed-through pin (hermetic feed-through receptacles)
Key
  • N Normal key position
  • A B C D E Alternate key positions
Suffix
  • -U Reverse-side plug (plugs only)
  • V Fluorosilicone (oil-resistant) seals, not with MT
  • R(X) NiCr–NiSi thermocouple contacts, X = number of pairs

Part numbers on this site are shown without the manufacturer prefix. Quotations, drawings and product markings show the complete part number.

Cadmium finishes (W, J) are not RoHS compliant and are supplied on request; nickel or composite finishes are recommended for export to the EU.

Insert arrangements

184 standard layouts, viewed from the mating face of the pin insert. The arrangement number is written as shell size – layout (for example 25-35). The service rating sets the withstanding voltage (see specifications).

184 layouts

ArrangementContactsContact sizesService rating
9-02x22 × size 20I
9-0333 × size 20I
9-1011 × size 12I
9-1111 × size 16I
9-3566 × size 22DM
9-4333 × size 22DI
9-9833 × size 20I
11-0111 × size 12I
11-0222 × size 16I
11-0444 × size 20I
11-0555 × size 20I
11-08a84 × size 20, 4 × size 22DM
11-1554 × size 22D, 1 × size 12N
11-351313 × size 22DM
11-4333 × size 16M
11-9866 × size 20I
11-9977 × size 20I
13-0222 × size 12I
13-0333 × size 16II
13-03a33 × size 12N
13-0444 × size 16I
13-0531 × size 16, 2 × size 12I
13-06a62 × size 16, 4 × size 20M
13-06x63 × size 12, 3 × size 22DM
13-06y62 × size 12, 4 × size 20M
13-0888 × size 20I
13-08a84 × size 16, 4 × size 20M
13-12x1211 × size 22D, 1 × size 12 coaxM
13-12a1212 × size 20N
13-13133 × size 16, 10 × size 22DN
13-16163 × size 16, 13 × size 22DN
13-2411 × size 12II
13-2682 × size 12, 6 × size 22DM
13-352222 × size 22DM
13-4555 × size 16I
13-5054 × size 20, 1 × size 10M
13-6064 × size 16, 2 × size 20I
13-981010 × size 20I
13-9973 × size 16, 4 × size 20I
15-0222 × size 12II
15-03x32 × size 12, 1 × size 16I
15-03y33 × size 12M
15-0555 × size 16II
15-06a66 × size 16M
15-07a77 × size 16I
15-12122 × size 12, 2 × size 20, 8 × size 22DM
15-13x132 × size 12, 11 × size 22DM
15-13y134 × size 16, 2 × size 20, 7 × size 22DM
15-14148 × size 22D, 6 × size 16N
15-151514 × size 20, 1 × size 16I
15-16a171 × size 16, 16 × size 22DM
15-181818 × size 20I
15-191919 × size 20I
15-23y233 × size 16, 2 × size 20, 18 × size 22DM
15-31311 × size 12, 30 × size 22DM
15-353737 × size 22DM
15-3844 × size 12II
15-39162 × size 10, 14 × size 22DM
15-4888 × size 16I
15-97128 × size 20, 4 × size 16I
17-023938 × size 22D, 1 × size 8 twinaxM
17-0332 × size 10, 1 × size 16N
17-05x55 × size 12I
17-0666 × size 12I
17-07a74 × size 12, 3 × size 16I
17-0888 × size 16II
17-0991 × size 12, 5 × size 16, 3 × size 20M
17-09a95 × size 12, 4 × size 20M
17-11113 × size 12, 8 × size 20N
17-12x123 × size 12, 9 × size 22DN
17-14x166 × size 12, 10 × size 22DM
17-14y142 × size 12, 4 × size 16, 8 × size 20M
17-15x158 × size 16, 3 × size 20, 4 × size 22DM
17-16a166 × size 12, 10 × size 22DM
17-16x62 × size 10, 1 × size 16, 3 × size 20I
17-19y194 × size 16, 11 × size 20, 4 × size 22DM
17-20a201 × size 12, 19 × size 22DM
17-20x202 × size 12, 2 × size 20, 16 × size 22DI
17-20y204 × size 12, 16 × size 22DM
17-21x214 × size 12, 17 × size 22DN
17-262626 × size 20I
17-27y77 × size 12I
17-28a283 × size 12, 25 × size 22DM
17-30x63 × size 10, 3 × size 20N
17-355555 × size 22DM
17-36a361 × size 12, 35 × size 22DN
17-531313 × size 16I
17-992321 × size 20, 2 × size 16I
17-99a234 × size 16, 19 × size 20N
19-0554 × size 10, 1 × size 20N
19-0664 × size 10, 2 × size 22DI
19-08x88 × size 12N
19-10y102 × size 10, 1 × size 12, 7 × size 16I
19-10a105 × size 12, 5 × size 16I
19-111111 × size 16II
19-12102 × size 10, 1 × size 16, 7 × size 20I
19-13y138 × size 12, 5 × size 20I
19-14146 × size 12, 8 × size 20I
19-16162 × size 12, 14 × size 16I
19-17172 × size 12, 15 × size 20M
19-181814 × size 22D, 4 × size 8 twinaxM
19-191919 × size 16M
19-20168 × size 16, 4 × size 20, 4 × size 22DM
19-22a222 × size 12, 6 × size 16, 14 × size 22DM
19-22x2222 × size 20I
19-22y227 × size 12, 15 × size 22DM
19-24208 × size 16, 4 × size 20, 8 × size 22DI
19-282826 × size 20, 2 × size 16I
19-28a2812 × size 16, 16 × size 22DI
19-303029 × size 20, 1 × size 16I
19-323232 × size 20I
19-356666 × size 22DM
19-456767 × size 22DM
19-93322 × size 10, 6 × size 20, 24 × size 22DI
19-9699 × size 12I
21-111111 × size 12II
21-12a1212 × size 12N
21-13132 × size 10, 7 × size 12, 4 × size 20M
21-161616 × size 16II
21-242424 × size 20I
21-252525 × size 20I
21-272727 × size 20I
21-28283 × size 10, 25 × size 22DI
21-28a2814 × size 16, 14 × size 22DM
21-34a341 × size 10, 33 × size 20M
21-357979 × size 22DM
21-393937 × size 20, 2 × size 16I
21-414141 × size 20I
21-41a414 × size 12, 2 × size 16, 1 × size 20, 34 × size 22DN
21-51511 × size 12, 8 × size 16, 42 × size 22DN
21-61y616 × size 16, 55 × size 22DN
21-63632 × size 12, 61 × size 22DM
21-702020 × size 16M
21-7544 × size 8 twinaxN
23-06ay66 × size 10II
23-09a95 × size 10, 2 × size 12, 2 × size 22DM
23-141414 × size 12I
23-19194 × size 12, 15 × size 16M
23-212121 × size 16II
23-26268 × size 12, 18 × size 20M
23-292929 × size 16M
23-323232 × size 20I
23-343434 × size 20I
23-34a344 × size 12, 16 × size 16, 14 × size 22DM
23-35100100 × size 22DM
23-363636 × size 20I
23-37376 × size 12, 31 × size 20I
23-37a372 × size 12, 4 × size 16, 31 × size 20N
23-535353 × size 20I
23-555555 × size 20I
23-707010 × size 20, 60 × size 22DM
23-868616 × size 20, 70 × size 22DM
23-971616 × size 16I
23-991111 × size 16II
25-045648 × size 20, 8 × size 16I
25-079997 × size 22D, 2 × size 8 twinaxN
25-0888 × size 8 twinaxN
25-10106 × size 10, 4 × size 12N
25-11112 × size 20, 9 × size 10N
25-121212 × size 10N
25-191919 × size 12I
25-203010 × size 20, 13 × size 16, 1 × size 12 coax, 3 × size 12 shielded, 3 × size 8 twinaxN
25-242412 × size 16, 12 × size 12I
25-25x258 × size 10, 4 × size 12, 1 × size 16, 4 × size 20, 8 × size 22DM
25-25a259 × size 10, 8 × size 16, 8 × size 20N
25-292929 × size 16I
25-303014 × size 12, 16 × size 22DN
25-32y326 × size 10, 10 × size 16, 16 × size 20M
25-35128128 × size 22DM
25-373737 × size 16M
25-39392 × size 12, 17 × size 16, 20 × size 20M
25-41413 × size 10, 24 × size 16, 14 × size 22DI
25-52a5212 × size 16, 40 × size 20M
25-58582 × size 12, 20 × size 20, 36 × size 22DM
25-59598 × size 12, 5 × size 16, 46 × size 22DI
25-616161 × size 20I
25-64a648 × size 16, 40 × size 20, 16 × size 22DN
25-68684 × size 12, 64 × size 22DM
25-696910 × size 16, 15 × size 20, 44 × size 22DM
25-92y924 × size 20, 88 × size 22DM
25-93x1188 × size 16, 110 × size 22DM
25-434323 × size 20, 20 × size 16I
25-45458 × size 12, 37 × size 20M
25-464640 × size 20, 4 × size 16, 2 × size 8 twinaxI

Typical applications

  • Rail and transit rolling stock
  • Oil, gas and energy instrumentation
  • Industrial robots and heavy machinery
  • Test and measurement systems
  • Marine and offshore electronics
  • Motorsport and specialty vehicles

Frequently asked questions

Is J599 Series III the same as MIL-DTL-38999 Series III?

J599 Series III is built to GJB 599B Series III, the Chinese counterpart of MIL-DTL-38999 Series III, with shell sizes 9–25, triple-start threaded coupling and insert arrangements numbered the same way (for example 25-35 with 128 size 22D contacts). Send us your D38999 part number and we will propose the matching configuration and samples for your mating test.

Which finish should I choose?

Nickel on aluminum (F) is the general choice. For marine or corrosive environments choose composite (M, up to 2000 h salt spray) or stainless steel; for lowest weight with high strength choose titanium (TA). Cadmium finishes are available on request but are not RoHS compliant.

Do you make hermetic 38999-type receptacles?

Yes. J599/21, /23, /25 and /27 hermetic receptacles and feed-through receptacles are available in stainless steel or titanium, with leak rate ≤ 1 × 10⁻⁸ Pa·m³/s at 0.1 MPa pressure differential.

What current can each contact carry?

From 2 A (size 26) to 33 A (size 10). See the contact size table for contact resistance and wire sizes.

Selection guides

From sample to production

  1. Send your requirement

    Part number, drawing, pin-out or a short description of your application.

  2. Configuration and quote

    Our engineers match the configuration and reply with a drawing and quotation.

  3. Samples

    Samples are made to your order. Third-party testing to your specification is available on request.

  4. Your approval

    You test the samples in your own equipment and approve them.

  5. Series production

    Production follows the approved sample configuration.

Need a quote or a drawing?

Send your part number, pin-out or drawing. An engineer will reply by email.

Request a quote

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