MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, operating in temperatures from -65 °C to 200 °C. With front wall mount, rear wall mount, and jam nut receptacles, they offer versatility for various applications. Compliant with military specification MIL-DTL-38999 I, these connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts. Constructed with high-strength aluminum shells and available in different plating options, including cadmium-free finishes, they ensure durability and reliability. Designed for harsh environments, these circular receptacles, contact gender female, with gold-plated removable crimp contacts, offer a mating type of bayonet coupling and a service rating of I. Suitable for wall mounting, they provide a secure and conductive connection with ingress protection, making them ideal for demanding industrial and military applications.