The online power tool trade counter:

The 1/2' square drive impact wrench is a tool that has been designed for medium sized bolts. When using an impact wrench it is important to use the right size tool for the bolt, since an impact wrench that is too powerful may strip the bolt. A half inch square drive impact wrench is commonly used by scaffolders. Impact wrenches use dedicated impact sockets, which are designed to handle the torque that the tool imparts.

  • 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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