J599/26fa03pn Amphenol Standard Circular Mil Spec Connector
J599/26FA03PN Straight Plug, GJB599 Series III / MIL-DTL-38999 Series III
The J599/26FA03PN 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 D38999/26FA03PN designation used in MIL-DTL-38999 Series III supply chains.
This straight plug features Class F electroless nickel finish, shell size A (shell size 9), insert arrangement A03 / 9-3 (3 contacts: 3 x #22D signal), 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 D38999/26FA03PN
- Triple-start threaded self-locking coupling for high-vibration retention
- Straight plug style for cable-end termination
- Class F electroless nickel shell finish for corrosion resistance and conductivity
- Compact signal-only configuration (P) with insert arrangement A03 / 9-3: 3 x #22D signal contacts
- Normal keying (N) for standard polarization and anti-mismatch mating
Technical Specifications - J599/26FA03PN
| Parameter | Value |
|---|---|
| Part Number | J599/26FA03PN |
| Equivalent Part Number | D38999/26FA03PN |
| 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 | F - Electroless nickel plating |
| Shell Size | A (numeric shell size 9) |
| Insert Arrangement | A03 / 9-3 (3 contacts: 3 x #22D signal) |
| 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 F) |
| Compatible Mating | J599/20FA03SN or J599/24FA03SN receptacle (or D38999 equivalents), shell size A, arrangement 03, socket contacts, keying N |
Part Number Breakdown
| Segment | Meaning |
|---|---|
| J599 | GJB599 Series III circular connector family (D38999 equivalent) |
| /26 | Straight plug |
| F | Electroless nickel finish (Class F) |
| A | Shell size A (shell size 9) |
| 03 | Insert arrangement 03 (A03 / 9-3) |
| P | Pin contacts |
| N | Normal keying position |
Related options: J599/26WA03PN uses olive drab cadmium finish (W); J599/26KA03PN uses stainless Class K; socket versions use S contacts; mating square-flange receptacle is J599/20FA03SN; jam-nut receptacle is J599/24FA03SN. Same shell size also commonly uses arrangements A35 (sealed, Service Class M) and A98 (non-sealed, Service Class I). There is no functional difference between J599 and D38999 prefixes for form-fit-function mating within the same Series III family.
Compatible Applications
The J599/26FA03PN straight plug is intended for platforms that require EMI-capable threaded interconnects with compact signal circuits in shell size 9. 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 A / arrangement 03 / pins / keying N / nickel | J599/26FA03PN - this product |
| Same plug with cadmium olive drab finish | J599/26WA03PN |
| Same plug with stainless Class K finish | J599/26KA03PN |
| Matching square flange receptacle with socket contacts | J599/20FA03SN / D38999/20FA03SN |
| Matching jam-nut receptacle with socket contacts | J599/24FA03SN / D38999/24FA03SN |
| Sealed signal layout in shell size A (Service Class M) | J599/26FA35PN |
| Non-sealed signal layout in shell size A (Service Class I) | J599/26FA98PN |
Installation Notes
- Verify shell size, insert arrangement, contact gender, finish class, and keying before mating.
- Use the correct crimp tooling for #22D signal contacts specified by arrangement A03 / 9-3.
- Select and install a compatible M85049 / GJB1784 backshell or strain relief for shell size 9.
- 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 J599/26FA03PN
Form-Fit-Function Compatibility
Choosing J599/26FA03PN ensures form-fit-function compatibility with D38999/26FA03PN supply chains while meeting GJB599 Series III requirements. The straight plug geometry supports secure mating, EMI continuity, and reliable compact signal interconnect in aerospace and industrial systems.
Ordering Information
Order by the GJB599 designation J599/26FA03PN, or cross-reference as D38999/26FA03PN, depending on your procurement standard. When requesting a quote, please confirm mating receptacle part number, backshell / accessory needs, contact plating, and required quantity.
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