D38999/26TD35SN is a MIL-DTL-38999 Series III subminiature connector featuring a straight plug configuration with environmentally sealed design for harsh environment applications. The connector utilizes a threaded 360° turn coupling mechanism and is available with stainless steel, aluminum, or composite shell materials, with multiple plating options including electroless nickel, nickel PTFE, black zinc-nickel, and olive drab cadmium. It supports up to 187 maximum signal contacts with AS39029 contact type, available in crimp, solder cup/eyelet, or PCB tail styles, and operates across a temperature range of -65°C to +200°C depending on shell finish. The connector features scoop-proof design, EMI spring fingers, and is rated for 500 mating cycles with higher durability versions available. This connector is widely used in aerospace, defense, and marine systems where environmental sealing, EMI control, and reliable performance in extreme conditions are essential.