MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating in temperatures ranging from -65 °C to 200 °C, these connectors offer front wall mount, rear wall mount, jam nut, rear box mount, and front box mount receptacles. Available in aluminum shells, they come in various plating options, including cadmium-free finishes for RoHS compliance. With 52 insert arrangements and M39029 rear release crimp contacts, these connectors ensure reliable performance. Suitable for military and industrial applications, they provide secure connectivity with gold-plated removable crimp contacts. The bayonet coupling design and straight plug configuration make them easy to install in demanding settings, offering durability with anodized finish coating.