DF81 Board-to-Micro Coaxial Cable Connectors Hirose Electric DF81 Series 0.4mm Pitch, Horizontal Mating, Board-to-Micro Coaxial Cable Connectors utilizes its 0.4mm pitch, to offer a space-saving design and a low height of 0.9mm in a single row connector. Designed to optimize transmission speeds, the DF81 series provides superior signal characteristics. Shielding capacity is increased by providing multiple grounding points.