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This contact pin is a product called Coaxial contact pin. It is a product that can minimize insertion loss and return loss by adjusting the impedance with the coaxial structure.

In high frequency circuits, it is important and required to minimize signal losses and to transmit the power of the signal source most efficiently, so it is necessary to adjust the impedance in order to keep reflection minimized at the transmission line and the load end. Especially in the coaxial connector and the conversion part from the coaxial circuit to the strip line, there is a physical change point, so it is important to optimize the impedance setting by selecting parts and matching circuit so that VSWR can be minimized. In the case of the coaxial structure, the waveform remains stable even with a long pin, but in the case of other standard pins, the waveform starts fractuating when the pin length becomes longer.
In that point, this Coaxial contact pin can minimize insertion loss and return loss by adjusting the impedance with the coaxial structure, and can obtain good crosstalk performance by the shield metal housing.

Coaxial contact pin is a solution for IC sockets that require high frequency characteristics testing, where characteristics cannot be obtained simply by shortening ordinary contact pins.