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`ABSTRACT OF THE DISCLOSURE
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`A rotary impact tool can be used continuously for fastening a
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`plurality of fastening members such as screws, bolts or nuts in tight
`fastening mode. The rotary impact tool comprises a rotary driving
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`mechanism including a motor for rotating 3 driving shaft, a hammer
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`engaged with the driving shafi, an output shaft to which a driving
`force is applied by impact blow of the hammer, a main switch
`operated by a user for controlling fastening operation, and a controller
`for controlling on and off of the motor. The controller has a normal
`fastening mode and a tight fastening mode, and a tight fastening mode
`setting switch used for setting the tight fastening mode is further
`comprised. When the tight fastening mode setting switch is
`switched on, the controller continuously drives the rotary driving
`mechanism so as to perform tight fastening operation continuously.
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`15
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