MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range from -65 °C to 200 °C. These harsh environment connectors come in various styles, including front and rear wall mount, jam nut, and box mount receptacles. Available as straight or angled plugs with RFI grounding options, they come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts. Constructed with aluminum shells, the connectors offer plating choices like iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS compliant finishes available. Suitable for military applications, these connectors provide reliable performance in demanding environments.