MIL-DTL-38999 Series II connectors are designed for rugged environments, featuring up to 128 contacts in an insert with environmental sealing. These versatile connectors operate flawlessly in temperatures ranging from -65 °C to 200 °C. Available in various configurations including front and rear wall mounts, jam nut, and box mounts, they offer flexibility for different applications. The connectors come in aluminum shells with options for plating, including cadmium-free finishes. Utilizing M39029 rear release crimp contacts, they ensure reliable connections with sizes ranging from 22D to 12. With a bayonet coupling mechanism, they provide secure mating, ideal for military and aerospace applications. The connectors are RoHS compliant and offer durability with a mating life of 500 cycles, making them a trusted choice for demanding environments.