MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, boasting a wide operating temperature range of -65 °C to 200 °C. This connector family offers front and rear wall mount, as well as jam nut receptacles with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes, including coax and twinax options. Constructed with high-strength aluminum shells, these connectors come in different plating options such as cadmium and nickel, ensuring durability in harsh environments. The connectors are RoHS compliant, making them a reliable choice for demanding applications.