| 摘要 |
PURPOSE: To easily, inexpensively, and accurately utilize a torque angle method by forming a permanent mark corresponding to a predetermined angle distance on a flange between a shank part and a torque receive part in advance. CONSTITUTION: A first V-shaped cutout part 9 is provided on a flange 15 between a torque receive part 13 and a shank 17, and a second V-shaped cutout part 11 is provided in an outer peripheral fringe part of the flange 15 to visually confirm the first cutout part 9 and the second cutout part 11 easily even when a wrench is attached during final rotation. The first cutout part 9 is separated from the second cutout part 11 by an angle distance corresponding to a predetermined value equal to a final distance at which a tightening tool 1 is rotated to complete each torque angle method. The first cutout part 9 and the second cutout part 11 are formed on the tightening tool 1 while the tightening tool 1 is molded. |
