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 come in various configurations such as front and rear wall mounts, jam nuts, and box mounts. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts. Constructed with aluminum shells, they offer plating options including cadmium-free finishes. With a straight plug shell style, these connectors are ideal for military and industrial applications requiring reliable performance in demanding conditions.