MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. These circular connectors, compliant with military specification MIL-DTL-38999 I, are crafted for durability with high-strength aluminum shells and various plating options, including cadmium-free finishes. With a wide operating temperature range from -65°C to 200°C, they ensure reliable performance in extreme conditions. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Ideal for applications requiring environmental resistance, these connectors meet stringent standards for conductivity and ingress protection.