MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert with front wall mount, rear wall mount, and jam nut receptacles for versatile installation. These connectors, part of the military specification MIL-DTL-38999 I, offer reliable performance in temperatures ranging from -65 °C to 200 °C. Constructed with high-strength aluminum shells and available in various plating options including cadmium-free finishes, they ensure durability and environmental sealing. Utilizing M39029 rear release crimp contacts in different sizes, these connectors provide optimal connectivity for applications requiring RoHS compliance. With a mating type of bayonet and contact style of pin, they are ideal for environment-resistant box and through bulkhead mounting receptacle types.