Abstract: A pressure device for a test socket includes a main pressure body (70) defining a substantially rectangular opening sized to allow a sub-pressure body (60) to be therewithin, and the sub-pressure body accommodated within the main pressure body. At least one passage (601, 701) is formed on lateral sections between the main pressure body and the sub-pressure body. A fastening member (10) is to be within the at least one passage for fastening the sub-pressure body to the main pressure body, and includes a core section (101) and an end (102) attached to the core section. The end of the fastening member defines a surface shaped to facilitate a wrench to be engaged therewithin, which is easy to extract the fastening member from the passages of the main pressure body and the sub-pressure body by the use of the conventional wrench available in the factory.