The MIL-DTL-38999 III (D38999) harsh environment connectors offer reliable performance in demanding conditions. Available in various configurations including wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs, they cater to diverse connectivity needs. With 9 shell sizes and 54 insert arrangements, these connectors accommodate M39029 contacts in sizes 22D, 20, 16, 12, 10 power, and 8 twinax, ensuring compatibility across different systems. Crafted from durable materials such as aluminum, stainless steel, and lightweight composite, they provide robust construction for long-lasting use. The wide range of plating options, including olive drab cadmium, nickel, black zinc nickel, and passivated stainless steel, offers flexibility in meeting specific requirements. In addition to RoHS-compliant and cadmium-free finishes, Boeing BACC-approved designs are also available. Ideal for military and aerospace applications, these connectors feature a straight plug design with removable crimp contacts, Series III compliance, and Electroless Nickel coating for enhanced performance. With a maximum operating temperature of 200 °C and a minimum of -65 °C, they ensure reliable operation in extreme environments. Conductive in nature, with N keyway polarization and threaded mating type, these connectors guarantee secure and efficient connectivity. The Electroless Nickel Plated Aluminum Shell (Conductive) construction, with a service rating of M and service class F, provides excellent shielding and protection, making them suitable for use in harsh and mission-critical settings. With a male contact gender, 500 cycles mating life, and environment-resistant ingress protection, they offer high performance and durability in demanding applications.