Aviation Connector Circular Electrical Rfi Connector J599/26fj38sb

J599/26FJ38SB Straight Plug, GJB599 Series III / MIL-DTL-38999 Series III

The J599/26FJ38SB 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 D38999/26FJ38SB designation used in MIL-DTL-38999 Series III supply chains.

This straight plug features Class F electroless nickel finish, shell size J (shell size 25), insert arrangement J38 / 25-38 (38 contacts: 38 x #22D signal), socket contacts (S), and keying position B (not normal 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 D38999/26FJ38SB
• 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
• Sealed signal-only configuration (S) with insert arrangement J38 / 25-38: 38 x #22D signal contacts (Service Class M - sealed)
• Keying position B for polarization and anti-mismatch mating

Technical Specifications - J599/26FJ38SB

Part Number Breakdown

Related options: J599/26WJ38SB uses olive drab cadmium finish (W); J599/26KJ38SB uses stainless Class K; pin contact version is J599/26FJ38PB; mating square-flange receptacle is J599/20FJ38PB; jam-nut receptacle is J599/24FJ38PB. Same shell size also commonly uses arrangements J19 (19 x #22D sealed signal) and J53 (53 x #22D high-density signal). Keying B is incompatible with keying N receptacles — ensure all mating parts use the same keying position. There is no functional difference between J599 and D38999 prefixes for form-fit-function mating within the same Series III family.

Compatible Applications

The J599/26FJ38SB straight plug is intended for platforms that require EMI-capable threaded interconnects with mid-density signal circuits in shell size J (25), using keying position B. 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

Installation Notes

• Verify shell size, insert arrangement, contact gender, finish class, and keying position B before mating.
• Use the correct crimp tooling for #22D signal contacts specified by arrangement J38 / 25-38.
• Select and install a compatible M85049 / GJB1784 backshell or strain relief for shell size 25.
• 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 keying position B (keying N is not compatible).

Why Choose J599/26FJ38SB

Form-Fit-Function Compatibility

Choosing J599/26FJ38SB ensures form-fit-function compatibility with D38999/26FJ38SB supply chains while meeting GJB599 Series III requirements. The straight plug geometry supports secure mating, EMI continuity, and reliable mid-density signal interconnect with keying B polarization in aerospace and industrial systems.

Ordering Information

Order by the GJB599 designation J599/26FJ38SB, or cross-reference as D38999/26FJ38SB, depending on your procurement standard. When requesting a quote, please confirm mating receptacle part number (must use keying B), backshell / accessory needs, contact plating, and required quantity.