D38999/24WJ35SN is a MIL-DTL-38999 Series III jam nut receptacle connector designed for rugged, harsh environment applications in aerospace, defense, and marine industries. The connector features a stainless steel shell with electrodeposited nickel plating, providing 48-hour salt spray corrosion resistance, and employs a threaded 360° turn coupling mechanism for secure mating. It supports up to 187 maximum signal contacts with AS39029 contact type, available in multiple contact sizes (23, 22, 20, 16, 12, 10, 8) and shell sizes (9 through 25), with contact styles including crimp, solder cup/eyelet, and PCB tail options. The connector operates across a temperature range of -65°C to +150°C depending on shell finish, offers environmentally sealed construction with scoop-proof design, and includes optional hermetic and filter versions with spring fingers for EMI control. With 500 mating cycles durability and rear panel jam nut mounting configuration, this connector is ideal for demanding aerospace and defense applications requiring reliable, sealed electrical connections in extreme environments.