D38999/26fd03pn Electrical Connector Manufacturers Amphenol Standard

D38999/26FD03PN Straight Plug, MIL-DTL-38999 Series III / GJB599 Series III

The D38999/26FD03PN is a triple-start threaded circular electrical connector plug designed for aerospace, avionics, and industrial platforms. It conforms to MIL-DTL-38999 Series III requirements and is interchangeable with the J599/26FD03PN designation used in GJB599 Series III supply chains.

This straight plug features Class F electroless nickel finish, shell size D (shell size 15), insert arrangement D03 / 15-3 (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 MIL-DTL-38999 Series III (equivalent to GJB599 Series III / J599)
• Interchangeable with cross-reference part number J599/26FD03PN
• 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
• Low-count signal-only configuration (P) with insert arrangement D03 / 15-3: 3 x #22D signal contacts
• Normal keying (N) for standard polarization and anti-mismatch mating

Technical Specifications - D38999/26FD03PN

Part Number Breakdown

Related options: D38999/26WD03PN uses olive drab cadmium finish (W); D38999/26KD03PN uses stainless Class K; socket versions use S contacts; mating square-flange receptacle is D38999/20FD03SN; jam-nut receptacle is D38999/24FD03SN. Same shell size also commonly uses arrangements D6, D8, D26, and D35. There is no functional difference between D38999 and J599 prefixes for form-fit-function mating within the same Series III family.

Compatible Applications

The D38999/26FD03PN straight plug is intended for platforms that require EMI-capable threaded interconnects with low-count signal circuits in shell size 15. 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 MIL-DTL-38999 / GJB599 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 #22D signal contacts specified by arrangement D03 / 15-3.
• Select and install a compatible M85049 / GJB1784 backshell or strain relief for shell size 15.
• 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 D38999/26FD03PN

Form-Fit-Function Compatibility

Choosing D38999/26FD03PN ensures form-fit-function compatibility with J599/26FD03PN supply chains while meeting MIL-DTL-38999 Series III requirements. The straight plug geometry supports secure mating, EMI continuity, and reliable low-count signal interconnect in aerospace and industrial systems.

Ordering Information

Order by the MIL-DTL-38999 designation D38999/26FD03PN, or cross-reference as J599/26FD03PN, depending on your procurement standard. When requesting a quote, please confirm mating receptacle part number, backshell / accessory needs, contact plating, and required quantity.