MIL-DTL-38999 Series I connectors offer robust connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs. With a wide operating temperature range from -65 °C to 200 °C, they are suitable for demanding applications. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for reliable connections. Constructed with high-strength aluminum shells, they come in various plating options including electroless nickel for enhanced durability. RoHS compliant finishes are also available, making them a versatile choice for military and industrial use.