PTS647 4.5mm Tactile Switches C&K Switches PTS647 4.5mm Tactile Switches are compact SMT terminal switches with a 4.5mm x 4.5mm footprint. These switches are available in 3.8mm, 5mm, and 7mm actuator heights with three actuation force options. C&K PTS647 switches feature IP40 sealing and withstand 100K life cycles. Applications include industrial control panels, computer products, home automation, Internet of Things (IoT), TV and internet boxes, home and garden equipment, professional control panels, and more.