MIL-DTL-38999 III (D38999) harsh environment connectors offer reliable electrical connections in demanding conditions. This series features wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs, providing versatility for various applications. With 9 shell sizes and 54 insert arrangements available, these connectors accommodate different contact configurations, including M39029 removable crimp contacts. Constructed from durable materials such as stainless steel and lightweight composite, they ensure long-lasting performance. The passivated stainless steel shell with gold-plated removable crimp contacts in this specific D18 insert arrangement guarantees excellent conductivity and resistance to environmental factors, making it ideal for critical applications in aerospace, military, and industrial settings. With a service rating of I and a mating life of 500 cycles, these connectors meet stringent reliability standards.