The MIL-DTL-38999 Series I connectors offer robust performance in harsh environments with up to 128 contacts housed in a sealed insert. Designed for durability, they operate reliably in temperatures ranging from -65 °C to 200 °C. Featuring various mounting options including front and rear wall mounts, as well as jam nut receptacles, these connectors are versatile in their applications. With 52 insert arrangements available, they accommodate different connectivity needs, supported by M39029 rear release crimp contacts. Constructed with high-strength aluminum shells and offered in multiple plating options, including RoHS-compliant finishes, they ensure long-lasting and reliable connections. The bayonet coupling mechanism further enhances their ease of use, making them ideal for military and industrial settings where rugged performance is essential.