MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in an insert. These circular connectors feature various mounting options, including front and rear wall mount, jam nut, and box mount receptacles. With operating temperatures ranging from -65 °C to 200 °C, they ensure reliable performance in extreme conditions. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts. Constructed with aluminum shells and offering multiple plating options, including cadmium-free finishes, they meet stringent military specifications. The straight plugs, with options for RFI grounding, feature a 90-degree cable clamp for secure connections. Ideal for demanding applications, these connectors provide EMI/RFI shielding and are designed for environment-resistant box and through bulkhead mounting. With a contact gender of female and gold plating for optimal conductivity, they guarantee durability and longevity with a mating life of 500 cycles.