Low-thermal resistance pressing device for a socket

A low-thermal resistance pressing device for a socket, which is used to be connected to the socket, in which a device to be tested is accommodated, the pressing device comprising:

• a housing, including an axial through hole formed with an internal thread and perforating through an upper surface and a lower surface of the housing;
• an inner collar, accommodated in the axial through hole and formed with an external thread, which is threadedly engaged with the internal thread of the housing;
• a heat conductive pressing block, extending through the inner collar and protruding from the upper surface and the lower surface of the housing;
• a bearing collar, located between the inner collar and the heat conductive pressing block;
• and
• at least one locking member, assembled on the housing,
• wherein when the socket is locked by the locking member, rotating the inner collar causes a lower surface of the heat conductive pressing block to be brought into contact with the device to be tested and generates an axial force to the heat conductive pressing block so that the axial force is exerted on the device to be tested through the heat conductive pressing block.