D38999/26FA35PC is a MIL-DTL-38999 Series III subminiature connector designed for rugged, harsh environment applications in aerospace, defense, and marine industries. The connector features a threaded 360° turn coupling mechanism with scoop-proof design and environmental sealing to protect against contamination and moisture ingress. It is available with multiple shell materials including stainless steel, aluminum, and composite, with various plating options such as electroless nickel, nickel PTFE, black zinc-nickel, and olive drab cadmium to meet corrosion resistance requirements. The connector supports up to 187 maximum signal contacts across multiple shell sizes (9 through 25) and contact sizes (8 through 23), with contact styles including crimp, solder cup/eyelet, and PCB tail configurations. Operating temperature range extends from -65°C to +200°C depending on shell finish selection, with standard durability rated at 500 mating cycles. This connector is ideal for mission-critical applications requiring reliable electrical connections in demanding environmental conditions, offering hermetic and filter versions with EMI control through spring fingers.