High-Performance J599/26kc04n Circular Electrical Connector with Dust Cover
J599/26KC04N Straight Plug, GJB599 Series III / MIL-DTL-38999 Series III
The J599/26KC04N is a triple-start threaded circular electrical connector plug designed for aerospace, avionics, and industrial platforms. It conforms to GJB599 Series III requirements and is interchangeable with the D38999/26KC04N designation used in MIL-DTL-38999 Series III supply chains.
This straight plug features Class K stainless steel finish, shell size C (shell size 13), insert arrangement C04 / 13-4 (4 contacts: 4 x #12 power contacts), pin contacts (P — contact gender code should be confirmed with supplier), and normal keying (N). The design supports EMI shielding, scoop-proof mating, self-locking threaded coupling, and removable crimp contacts.
Product Features
- Conformant to GJB599 Series III (equivalent to MIL-DTL-38999 Series III / D38999)
- Interchangeable with cross-reference part number D38999/26KC04N
- Triple-start threaded self-locking coupling for high-vibration retention
- Straight plug style for cable-end termination
- Class K stainless steel shell finish for corrosion resistance and conductivity
- Power configuration (P) with insert arrangement C04 / 13-4: 4 x #12 power contacts (Service Class M - sealed)
- Normal keying (N) for standard polarization and anti-mismatch mating
Technical Specifications - J599/26KC04N
| Parameter | Value |
|---|---|
| Part Number | J599/26KC04N |
| Equivalent Part Number | D38999/26KC04N |
| Series | GJB599 Series III / MIL-DTL-38999 Series III |
| Connector Type | Straight plug (J599/26 / D38999/26) |
| Coupling | Triple-start threaded, self-locking |
| Finish Class | K - Stainless steel plating |
| Shell Size | C (numeric shell size 13) |
| Insert Arrangement | C04 / 13-4 (4 contacts: 4 x #12 power) |
| Contact Gender | P - Pin contacts (crimp, removable). Note: P/S code not explicit in given PN; confirm with supplier. |
| Keying / Polarization | N - Normal |
| Cable End Style | Straight plug (backshell / accessory attach as required) |
| Shielding | EMI shielded (conductive shell finish) |
| Operating Temperature | Approximately -65°C to +200°C (Class K) |
| Suffix Designation | None. Note: contact gender (P/S) segment between arrangement and keying appears omitted — confirm specific part number with supplier. |
| Compatible Mating | J599/20KC04S or J599/24KC04S receptacle (or D38999 equivalents), shell size C, arrangement 04, socket contacts, keying N |
Part Number Breakdown
| Segment | Meaning |
|---|---|
| J599 | GJB599 Series III circular connector family (D38999 equivalent) |
| /26 | Straight plug |
| K | Stainless steel finish (Class K) |
| C | Shell size C (shell size 13) |
| 04 | Insert arrangement 04 (C04 / 13-4, 4 x #12 power) |
| (omitted) | Contact gender — typically P (pin) or S (socket); confirm with supplier |
| N | Normal keying position |
Related options: J599/26FC04N uses electroless nickel finish (F); J599/26WC04N uses olive drab cadmium finish (W); socket contact version is J599/26KC04S; mating square-flange receptacle is J599/20KC04S; jam-nut receptacle is J599/24KC04S. Same shell size also commonly uses arrangements C35 (high-density #22D signal) and C26 (mid-count #20 signal). Note: contact gender (P/S) code between arrangement 04 and keying N appears omitted in the provided part number — confirm the complete PN (e.g. J599/26KC04PN or J599/26KC04SN) with supplier. There is no functional difference between J599 and D38999 prefixes for form-fit-function mating within the same Series III family.
Compatible Applications
The J599/26KC04N straight plug is intended for platforms that require EMI-capable threaded interconnects with low-count power circuits in shell size C (13), stainless steel finish. Typical use cases include:
- Aircraft and helicopter wiring harness cable ends
- Avionics LRUs, radar, and communication equipment
- Ground vehicles and rugged electronic enclosures
- Shipboard and outdoor equipment requiring sealed circular connectors
- Industrial systems that standardize on GJB599 / MIL-DTL-38999 Series III interfaces
Selection Guide
| Requirement | Recommended Choice |
|---|---|
| Straight plug, size C / arrangement 04 / pins / keying N / stainless (gender omitted, confirm) | J599/26KC04N - this product |
| Same plug with electroless nickel finish | J599/26FC04N |
| Same plug with olive drab cadmium finish | J599/26WC04N |
| Matching square flange receptacle with socket contacts | J599/20KC04S / D38999/20KC04S |
| Matching jam-nut receptacle with socket contacts | J599/24KC04S / D38999/24KC04S |
| Socket contact version of this plug | J599/26KC04S |
| High-density signal layout in shell size C | J599/26KC35N |
Installation Notes
- Verify shell size, insert arrangement, contact gender, finish class, and keying before mating.
- Use the correct crimp tooling for #12 power contacts specified by arrangement C04 / 13-4.
- Select and install a compatible M85049 / GJB1784 backshell or strain relief for shell size 13.
- Fully engage the triple-start threaded coupling until the self-locking mechanism is seated.
- Mate only with Series III receptacles of the same shell size, arrangement, opposite contact gender, and matching keying.
Why Choose J599/26KC04N
Form-Fit-Function Compatibility
Choosing J599/26KC04N ensures form-fit-function compatibility with D38999/26KC04N supply chains while meeting GJB599 Series III requirements. The straight plug geometry supports secure mating, EMI continuity, and reliable power interconnect with stainless steel finish in aerospace and industrial systems.
Ordering Information
Order by the GJB599 designation J599/26KC04N, or cross-reference as D38999/26KC04N, depending on your procurement standard. When requesting a quote, please confirm the complete part number including contact gender (P or S), mating receptacle part number, backshell / accessory needs, contact plating, and required quantity.
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