Mil Spec Connector Standard Connectors Receptacle Multi Pin Connectors J599

J599/20FC98PN Square Flange Wall Mount Receptacle, GJB599 Series III / D38999 Series III

The J599/20FC98PN is a triple-start threaded circular electrical connector receptacle designed for aerospace, avionics, and industrial platforms. It conforms to GJB599 Series III / J599 requirements and is interchangeable with the D38999/20FC98PN designation used in MIL-DTL-38999 Series III supply chains.

This wall-mount square flange receptacle features Class F electroless nickel finish, shell size C (shell size 13), insert arrangement C98 / 13-98 (10 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 D38999/20FC98PN
• Triple-start threaded self-locking coupling for high-vibration retention
• Square flange wall-mount receptacle for panel installation
• Class F electroless nickel shell finish for corrosion resistance and conductivity
• Pin contact configuration (P) with insert arrangement C98 / 13-98: typically 10 x #20 contacts
• Normal keying (N) for standard polarization and anti-mismatch mating

Technical Specifications - J599/20FC98PN

Part Number Breakdown

Related options: J599/20WC98PN uses olive drab cadmium finish (W); socket versions use S contacts; jam-nut style is J599/24FC98PN; mating plug is typically J599/26FC98SN. Same shell size also commonly uses arrangements C4, C8, and C35. There is no functional difference between J599 and D38999 prefixes for form-fit-function mating within the same Series III family.

Compatible Applications

The J599/20FC98PN square flange receptacle is intended for platforms that require EMI-capable threaded interconnects with mid-count #20 signal circuits. Typical use cases include:

• Aircraft and helicopter wiring harness panel interfaces
• 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 C98 / 13-98.
• Mount the square flange securely to the panel and keep sealing surfaces clean.
• Fully engage the triple-start threaded coupling until the self-locking mechanism is seated.
• Select matching Series III plug and M85049 / GJB1784 accessories compatible with shell size 13.

Why Choose J599/20FC98PN

Form-Fit-Function Compatibility

Choosing J599/20FC98PN ensures form-fit-function compatibility with D38999/20FC98PN supply chains while meeting GJB599 Series III requirements. The square-flange threaded receptacle geometry supports secure mating, EMI continuity, and reliable #20 interconnect in aerospace and industrial systems.

Ordering Information

Order by the GJB599 designation J599/20FC98PN, or cross-reference as D38999/20FC98PN, depending on your procurement standard. When requesting a quote, please confirm mating plug part number, contact plating, mounting panel cut-out, and required quantity.