A threaded fastener is configured to reduce stress experienced at a female threaded portion of a hole formed in an engine block, when the threaded fastener is inserted therein, and when an axial load is applied thereto. Methods for preparing each components of the conductive paste are disclosed including several embodiments of prepare Pb\u2014Te\u2014O-based crystal corrosion binder characterized by melting temperatures in a range of 440\xb0 C. The terahertz wave TxRx module package and method can remarkably reduce time and cost required to build a terahertz wave generation and measurement system, and simplify and miniaturize the terahertz wave generation and measurement system. Probes made of conductor rods are connected at the ends, respectively. A pushing member is formed in the pad body, and is elastically deformable so as to push the second spring terminal to abut against the negative electrode upon deformation of the pad body when the braking face is compressed. The recess may be aligned with the bottom surface of the first conductive layer, and the first surface of the first conductive layer may be aligned with the first area of the first surface of the first semiconductor layer.