MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within an insert and offering front wall mount, rear wall mount, jam nut, rear box mount, and front box mount receptacles. With a wide operating temperature range of -65 °C to 200 °C, these connectors are ideal for rugged applications. They come in aluminum shells with various plating options, including cadmium-free finishes, and utilize M39029 rear release crimp contacts. The connectors are RoHS certified and provide reliable performance in demanding military and industrial settings.