Molex KK 2.54mm Pitch PCB Headers with Straight Friction Lock, 6410 Series Molex KK 254 PCB wire to board vertical headers with a straight friction lock to ensure secure retention when mated making them ideal for use in high vibration environments. The housings of these KK 2.54mm wire to board PCB header connectors are made from red UL 94V-0 nylon and the contacts are tin plated brass. These KK 6410 series 2.54mm headers mate with 2695 and 6471 series crimp terminal housings with locking ramps and 7880 series high pressure housings.