MIL-DTL-38999M涵盖四个系列的微型、高密度、圆形、耐环境的电气连接器，带有可拆卸的压接触点，或带有固定、不可移动触点的密封电气连接器。抗环境和密封连接器均配有卡口、螺纹或后膛耦合的配合系统。连接器能够在最高-65°C至+200°C的温度范围内工作，或如本文所述（见1.4）。预期用途和应用见6.1。

MIL-DTL-38999M covers four series of miniature, high density, circular, environment resistant electrical connectors with removable crimp contacts, or hermetically sealed electrical connectors with fixed, nonremovable contacts. Both environment resistant and hermetically sealed connectors are available with bayonet, threaded, or breech-coupled mating systems. Connectors are capable of operating within a temperature range of -65°C to +200°C maximum, or as specified herein (see 1.4). See 6.1 for intended use and applications.