The SMPM (Sub-Miniature Push-on Micro) connector is a high-frequency, blind-mate RF interconnect standardized under MIL-STD-348B, designed for ultra-compact, high-density applications up to 65 GHz (some variants reach 100 GHz). With a 0.135-inch (3.43 mm) interface diameter, it is roughly 30% smaller than SMP, enabling tighter board-to-board spacing in dense phased-array radars, satellite payloads, and 5G/6G test systems.

Key features include push-on/snap-on mating for fast blind insertion, high vibration resistance, and excellent electrical performance: low VSWR (<1.25:1 typical to 65 GHz), low insertion loss, and high phase stability. SMPM offers full-detent, limited-detent, and smooth-bore mating styles to balance retention force and cycle life (100–500 cycles).

Typical configurations are male/female bullet adapters, cable connectors for .047" semi-rigid or flexible cables, and PCB mounts (surface-mount or through-hole). Materials are stainless steel or beryllium copper with gold plating for corrosion resistance and reliability. SMPM is widely used in aerospace, defense, quantum computing, and high-speed digital test equipment where size, performance, and blind-mate reliability are critical.