High performance outer cylindrical spring pin

An outer cylindrical spring pin comprising:

• a compression spring (30);
• an integrated upper probe (10) integrally provided with an upper probe portion (11) that is for contacting an outside, and with two upper probe side wall portions (12) which respectively extend opposite sides from each other from the upper probe portion (11) and which surround two side surfaces that are facing each other, among four side surfaces of the compression spring (30);
• and
• an integrated lower probe (20) integrally provided with a lower probe portion (21) that is for contacting the outside, and with two lower probe side wall portions (22) which respectively extend opposite sides from each other from the lower probe portion (21) and which surround other two side surfaces between the two side surfaces that is surrounded by the upper probe side wall portions (12), among the four side surfaces of the compression spring (30),
• wherein, when an external force is applied, the upper probe side wall portions (12) and the lower probe side wall portions (22) are capable of being slid on each other while being in contact with each other.