MIL-DTL-38999 Series I connectors with up to 128 contacts offer reliable performance in harsh environments, featuring front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. These circular connectors, complying with military specification MIL-DTL-38999, are crafted from high-strength aluminum shells and come in various plating options for enhanced durability. Utilizing M39029 rear release crimp contacts, they ensure secure connections in sizes 22D, 22M, 22, 20, 16, and 8. With an operating temperature range of -65 °C to 200 °C, they are ideal for demanding applications. RoHS compliant cadmium-free finishes are available, making them environmentally friendly choices for critical systems.