MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, providing robust environmental sealing for harsh conditions with an impressive operating temperature range of -65 °C to 200 °C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs, catering to diverse installation needs. Available in nine shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes, ensuring compatibility with different wire gauges. Crafted from high-strength aluminum, these connectors come in a range of plating options, including cadmium-free finishes for RoHS compliance. Designed for reliability, they offer secure bayonet coupling and a service rating of II, making them ideal for demanding applications that require durable and high-performance electrical connectivity.