I bought a cheap impact driver and I noticed that the bit is moving inside the chuck, like back and forth. Is this normal, like part of the hammer mechanism, or should the bit stay fixed?

  • 1
    Is it an impact driver or a hammer drill? Those are two different tools.
    – Dan D.
    Apr 26, 2018 at 18:45
  • it is a impact driver
    – minny
    Apr 26, 2018 at 19:02
  • Which direction is "back and forth"?
    – isherwood
    Apr 27, 2018 at 1:46
  • forward and backward, like a drill bit inside a SDS plus chuck
    – minny
    Apr 27, 2018 at 5:42

1 Answer 1


It's normal

If this is an impact driver (see below)

Impact Driver

then it uses a 1/4" hex chuck. Most use a simple ball-detent system to lock bits in place, which allows for some slip, especially forward and backward.

If you got an impact wrench (see below)

Impact Wrench

then it would be a problem, but if you were getting an impact wrench, you likely wouldn't be asking this question.

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