MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environment applications. Offering a wide operating temperature range from -65 °C to 200 °C, these connectors come in various configurations including front wall mount, rear wall mount, jam nut, rear box mount, and front box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offering plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, they cater to diverse needs. Meeting military specification MIL-DTL-38999 II, these circular connectors ensure reliable performance in demanding environments, with a mating type of bayonet coupling and contact plating in gold for enhanced conductivity. Each connector is meticulously crafted for durability, with a service rating of M and a contact mating life of 500 cycles. RoHS compliance is also available for those requiring cadmium-free finishes. Perfect for back panel wall mounting applications, these connectors are ideal for industries where rugged and reliable connectivity is essential.