Special screw for mounting and adjusting cat claw on steam turbine

The utility model discloses a screw special for installation and adjustment of a cat claw on a steam turbine. The screw comprises a spherical top, a cone frustum transition section, a cylindrical wrenching section, a thread ending section and a thread section which are sequentially, coaxially and integrally arranged from top to bottom. The top of the spherical surface, the cone frustum transition section and the cylindrical wrenching section form a screw head; the ending section and the threaded section form a screw rod; and two layers of wrenching holes, namely a first layer of wrenching hole and a second layer of wrenching hole, are radially formed in the cylindrical wrenching section in a penetrating manner. According to the screw special for installation and adjustment, the wrenching torque is greatly reduced by reducing the friction force between the top face of the screw head and the contact face of the installation cat claw. According to the screw special for installation and adjustment, the wrenching