MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in various styles including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. With options for straight, RFI grounding, and standard plugs, these connectors come in 9 shell sizes and 52 insert arrangements, utilizing reliable M39029 rear release crimp contacts. Constructed with aluminum shells and offering plating choices like cadmium and nickel, they ensure durability and performance. Compliant with RoHS regulations, these connectors are ideal for demanding applications requiring secure and efficient electrical connections.