MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in various mounting styles including front/rear wall mount and jam nut receptacles, they offer versatility in installation. With options for straight, RFI grounding, and standard plugs, these connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts. Constructed with aluminum shells and plated with finishes like electroless nickel and cadmium olive drab, they ensure reliability in demanding applications. The RoHS compliant connectors are suitable for military and industrial use, meeting stringent performance standards.