The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, these connectors offer reliable performance in extreme conditions. Available in various mounting styles such as front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse installation needs. With options for straight, RFI grounding, and standard plugs, along with 52 insert arrangements, these connectors provide flexibility for different applications. Constructed with aluminum shells and offering a range of plating options including cadmium-free finishes, they ensure durability and compliance with RoHS standards. The MS27472 model specifically features a wall mounting flange receptacle with crimp-type contacts, bayonet coupling, and gold plating for enhanced conductivity. Suitable for military and industrial use, these connectors guarantee reliable performance with 500 mating cycles and environment-resistant design.