impact wrench

noun
an electric or pneumatic power wrench with interchangeable toolhead attachments, used for installing and removing nuts, bolts, and screws.
Also called impacter, impactor.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The air tool with the nearest thing to a motor inside it is an impact wrench.
Use a pneumatic impact wrench to tighten bolted connections to proper
  specifications.
The connector was opened and closed by an impact wrench slung from an overhead
  crane.
We also note that the nuts on the anchor bolts were tightened using an air
  impact wrench.
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