MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Offering front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs, they ensure secure connections in demanding settings. Available in 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts for reliable performance. Constructed with high-strength aluminum shells, they come in various plating options including cadmium-free finishes, meeting RoHS certification. Suitable for military and industrial applications, these circular connectors provide durability and conductivity, with gold-plated contacts ensuring optimal signal transmission.