MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Constructed with high-strength aluminum shells and RoHS-certified plating options like cadmium-free finishes, these connectors ensure reliable performance. Equipped with gold-plated removable crimp contacts, they guarantee conductivity and longevity, suitable for demanding applications requiring environment resistance. The bayonet coupling, along with service class details for wall and jam nut mounting receptacles and plugs, make them ideal for military and industrial use.