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A ¾” square drive impact wrench is a tool that is used to tighten and untighten bolts. This is the typical sized impact wrench that is found in automotive environments and is suitable for heavy duty work, such as changing wheels and tyres on a car. When using an impact wrench it is important to use dedicated impact wrench sockets, else there is a danger of breaking the socket.

  • The key consideration when choosing between impact wrenches is the size of the hex drive (measured A/F or 'across flats') to suit increasingly larger sockets for increasingly larger nuts & bolts.
  • Choosing your power source: The first choice is between a mains (110v or 240v) or a cordless tool. 240v tools are used with normal mains power whilst 110v tools are used on construction sites for safety reasons.
  • With regards to cordless (battery powered) tools there are a variety of chemical types; Li-ion is the latest technology, prior to that it was Ni-MH and Ni-Cad was the original. The higher the Ah (Ampere hours) the longer the interval between charges; the fewer times you recharge a battery the longer it will last. Some cordless tools can also come without batteries - sometimes referred to as naked, bare units or body only. These tools are supplied without a battery or charger and more often than not without any accessories; as a result they are significantly cheaper in price.
  • Additionally there is often a choice between single, 2 or 3 speed gears. Most impact wrenches have a variable speed function.
Read more in our buying guide: Howe to Buying Guide
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