PCB Sockets Harwin PCB Sockets offer a range of 4-beam and 6-beam sockets, designed for robustness and reliability. These sockets are based on the same design as the Datamate four-finger Beryllium Copper contacts. The socket design is a two-part construction that features a contact clip retained in a precision-turned outer shell. Options for the shell include closed or open-ended, and with or without a knurled section for added board retention. Harwin PCB Sockets are ideal for environments that experience high vibration, shock, or temperature extremes.