J599/26FE26PN Straight Plug, GJB599 Series III / D38999 Series III

The J599/26FE26PN is a triple-start threaded circular electrical connector plug designed for aerospace, avionics, and industrial platforms. It conforms to GJB599 Series III / J599 requirements and is interchangeable with the D38999/26FE26PN designation used in MIL-DTL-38999 Series III supply chains.

This straight plug features Class F electroless nickel finish, shell size E (shell size 17), insert arrangement E26 / 17-26 (26 contacts), 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 D38999/26FE26PN
• 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
• Pin contact configuration (P) with insert arrangement E26 / 17-26: typically 26 x #20 contacts
• Normal keying (N) for standard polarization and anti-mismatch mating

Technical Specifications - J599/26FE26PN

Part Number Breakdown

Related options: J599/26WE26PN uses olive drab cadmium finish (W); J599/26KE26PN uses stainless Class K; socket versions use S contacts; mating square-flange receptacle is J599/20FE26SN; jam-nut receptacle is J599/24FE26SN. Same shell size also commonly uses arrangements E6, E8, E35, and E99. There is no functional difference between J599 and D38999 prefixes for form-fit-function mating within the same Series III family.

Compatible Applications

The J599/26FE26PN straight plug is intended for platforms that require EMI-capable threaded interconnects with mid-count #20 circuits in shell size 17. 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 / D38999 Series III interfaces

Selection Guide

Installation Notes

• Verify shell size, insert arrangement, contact gender, finish class, and keying before mating.
• Use the correct crimp tooling for #20 contacts specified by arrangement E26 / 17-26.
• Select and install a compatible M85049 / GJB1784 backshell or strain relief for shell size 17.
• 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 J599/26FE26PN

Form-Fit-Function Compatibility

Choosing J599/26FE26PN ensures form-fit-function compatibility with D38999/26FE26PN supply chains while meeting GJB599 Series III requirements. The straight plug geometry supports secure mating, EMI continuity, and reliable #20 interconnect in aerospace and industrial systems.

Ordering Information

Order by the GJB599 designation J599/26FE26PN, or cross-reference as D38999/26FE26PN, depending on your procurement standard. When requesting a quote, please confirm mating receptacle part number, backshell / accessory needs, contact plating, and required quantity.