US Patent 7102369 Contact pin, connection device and method of testing

A contact pin a connection device, and a method of testing. The contact pin may include a barrel (for example, a cylindrical barrel) having a screw thread on an inside wall, a contact tip formed at an end of the barrel, a spring located inside the barrel and having an end connected to the contact tip, a plunger formed at the other end of the barrel and connected to the other end of the spring, and at least one screw moving together with the screw thread. The plunger and/or the contact tip may have at least one screw, moving together with the screw thread.