D38999/26FE26SN is a MIL-DTL-38999 Series III subminiature connector designed for rugged, harsh environment applications in aerospace, defense, and marine industries. This straight plug connector features a threaded 360° coupling mechanism with environmentally sealed construction and electroless nickel plating (48-hour salt spray rating). The connector supports multiple shell sizes (9 through 25), accommodates up to 187 maximum signal contacts using AS39029 contact type, and offers contact styles including crimp, solder cup/eyelet, and PCB tail configurations. Operating across a temperature range of -65°C to +200°C (depending on shell finish), with 500 mating cycle durability and optional higher durability versions available, this connector provides scoop-proof design with EMI spring fingers for electromagnetic interference control. Its robust construction and comprehensive feature set make it ideal for demanding aerospace and defense applications requiring reliable electrical connectivity in extreme environments.