Electrical Wire Connector Stainless Steel Plug J599/26kh55pn
J599/26KH55PN Straight Plug, GJB599 Series III / MIL-DTL-38999 Series III
The J599/26KH55PN 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 D38999/26KH55PN designation used in MIL-DTL-38999 Series III supply chains.
This straight plug features Class K stainless steel finish, shell size H (shell size 23), insert arrangement H55 / 23-55 (55 contacts: 55 x #22D signal, Service Class M - sealed), pin contacts (P), 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 D38999/26KH55PN
- 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
- Sealed signal-only configuration (P) with insert arrangement H55 / 23-55: 55 x #22D signal contacts (Service Class M - sealed)
- Normal keying (N) for standard polarization and anti-mismatch mating
Technical Specifications - J599/26KH55PN
| Parameter | Value |
|---|---|
| Part Number | J599/26KH55PN |
| Equivalent Part Number | D38999/26KH55PN |
| 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 | H (numeric shell size 23) |
| Insert Arrangement | H55 / 23-55 (55 contacts: 55 x #22D signal). Note: non-standard arrangement — confirm with supplier. |
| Contact Gender | P - Pin contacts (crimp, removable) |
| 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 — keying N is the trailing segment |
| Compatible Mating | J599/20KH55SN or J599/24KH55SN receptacle (or D38999 equivalents), shell size H, arrangement 55, 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) |
| H | Shell size H (shell size 23) |
| 55 | Insert arrangement 55 (H55 / 23-55, 55 x #22D signal). Non-standard — confirm with supplier. |
| P | Pin contacts |
| N | Normal keying position |
Related options: J599/26FH55PN uses electroless nickel finish (F); J599/26WH55PN uses olive drab cadmium finish (W); socket contact version is J599/26KH55SN; mating square-flange receptacle is J599/20KH55SN; jam-nut receptacle is J599/24KH55SN. Same shell size also commonly uses arrangements H06 (low-count #12 power), H31 (39 x #22D signal), H37 (high-density signal), and H53 (high-density signal). Note: arrangement 55 is non-standard for shell 23 — confirm availability and contact count 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 J599/26KH55PN straight plug is intended for platforms that require EMI-capable threaded interconnects with mid-count sealed signal circuits in shell size H (23), using 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 H / arrangement 55 / pins / keying N / stainless | J599/26KH55PN - this product |
| Same plug with electroless nickel finish | J599/26FH55PN |
| Same plug with olive drab cadmium finish | J599/26WH55PN |
| Matching square flange receptacle with socket contacts | J599/20KH55SN / D38999/20KH55SN |
| Matching jam-nut receptacle with socket contacts | J599/24KH55SN / D38999/24KH55SN |
| Socket contact version of this plug | J599/26KH55SN |
| Standard high-density signal layout in shell size H | J599/26KH53PN |
Installation Notes
- Verify shell size, insert arrangement, contact gender, finish class, and normal keying (N) before mating.
- Use the correct crimp tooling for #22D signal contacts specified by arrangement H55 / 23-55.
- Select and install a compatible M85049 / GJB1784 backshell or strain relief for shell size 23.
- 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 normal keying (N).
Why Choose J599/26KH55PN
Form-Fit-Function Compatibility
Choosing J599/26KH55PN ensures form-fit-function compatibility with D38999/26KH55PN supply chains while meeting GJB599 Series III requirements. The straight plug geometry supports secure mating, EMI continuity, and reliable mid-count sealed signal interconnect with stainless steel finish in shell size H (23) for aerospace and industrial systems.
Ordering Information
Order by the GJB599 designation J599/26KH55PN, or cross-reference as D38999/26KH55PN, depending on your procurement standard. When requesting a quote, please confirm mating receptacle part number, backshell / accessory needs, contact plating, arrangement 55 availability, and required quantity.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.