6HDD78SCY99R40X is a 78-position D-Sub HD female connector designed for right-angle PCB mounting with solder pin termination. The connector features a robust construction with copper alloy metal shells plated with tin over nickel, PBT GF UL 94 V-0 insulators, and a zinc die cast nickel-plated frame for durability. It includes threaded inserts, metal brackets, fixing plates, and hex locking screws for secure panel mounting, along with silicon O-ring and PUR sealing compound for water resistance. The connector is RoHS compliant per Directive 2002/95/EC and supports wave soldering at 240°C for 5 seconds. Common applications include industrial equipment, instrumentation, and systems requiring high-density signal connections with environmental sealing.