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Sanko Techno developed an anchor bolt for hung objects that comes with a mechanism for visual confirmation. The new anchor bolt has launched sales in mid October. As you fasten the anchor bolt with an impact wrench, a black check ring appears out of the washer portion to let you know the fastening is completed. Therefore there is no need to use a torque wrench for torque check. Then, as you drive in the hanger bolt, the red dot on the nut portion of the anchor bolt extends out to let you know the drive depth is correct. This way you can prevent insufficient drive depth of the hanger bolt.

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