MIL-DTL-38999 Series II connectors are designed for demanding environments, offering up to 128 contacts in a single insert. Featuring a wide operating temperature range of -65 °C to 200 °C, these connectors are ideal for harsh conditions. Available in various mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they provide versatility for different applications. The connectors come in 9 shell sizes with 52 insert arrangements, utilizing M39029 rear release crimp contacts for reliable connections. Constructed with aluminum shells and offered in multiple plating options, including cadmium-free finishes, they ensure durability and compliance with RoHS standards. Suitable for military and industrial use, these connectors guarantee high performance with 500 mating cycles and excellent conductivity.