For mating QTH Series Headers see stock number ; 767-8745 767-8745 typical. QSH Series High Speed Ground Plane Socket. These Board to Board QSH Series SMT 0.5 mm pitch High Speed Ground Plane Sockets have 0.25 m Gold plated contacts and Ground Plane with Matte Tin plated Tails. This range of Board- to-Board QSH Series SMT 0.5 mm pitch High Speed Ground Plane Sockets have 3.5 mm body heights which gives a stack height of 5 mm when mated with the corresponding QTH Series Headers. The design of this range of Board to Board QSH Series SMT 0.5 mm pitch High Speed Ground Plane Sockets includes Alignment Pins.