for showing in step manner the process of the control of torsional force and the fixing of set screw according to the present invention in the drawings reference numerals 10 and 20 represent a fixing side hinge plate to be fixed to a door frame f and a movable side hinge plate to be fixed to a door d respectively a hollow cylindrical type fixing side hinge knuckle 11 in which a torsion spring 30 is inserted is formed at the intermediate portion of one side edge of said fixing hinge plate 10 movable side hinge knuckles 21 and 22 which are formed at upper and lower portions respectively of one side edge of the movable hinge plate 20 are disposed at the upper and lower end portions of said hinge knuckle 11 and turning together with the movable hinge plate 20 at the time of opening the door d and upper and lower pintles 40 and 50 provided respectively with cut out fixing grooves 41 and 51 to be inserted respectively with both end portions 31 and 32 of said torsion spring 30 are mounted so as to be confronted each other to the interior of the upper and lower hinge knuckles 21 and 22 a wrench groove 42 being able to insert with one end of a hexagonal wrench w1 is formed at the center of the top surface of the cylindrical body of said upper pintle 40 a few number of passing holes 43 43 1 43 2 and 43 3.