Published at Saturday, 25 August 2018. Impact Driver. By Lorie Grimes.
The most important thing to consider when it comes to choosing a powerful impact driver is its torque. To put it simply, torque is the strength and power of your power tool. Torque is measured in pounds-per-inch or in.-lbs. This is the pressure (in pounds) that your impact motor puts out per inch. So, if you're looking for a powerful impact, look for one with the highest in.-lbs. of torque. There are quite a few construction tool manufacturers that make them with high torque, including brands like Bosch, Ridgid, Makita, and DeWalt. I would consider any impact drill with 1400 or more in.-lbs. of torque as heavy duty.
Impact drivers pack a lot more punch than screwdrivers. Using a motor or compressed air, it's able to generate a lot faster spin and a repeating "punch" that other tools can't duplicate. If you're slightly confused about the spin and punch, think about it this way. You're driving a screw into a board with a screwdriver. In comes your partner with a rubber mallet. Every few seconds, your partner slams the back of your tool. That impact increases the driving force of the tool considerable. Not only is the tool spinning and driving the screw with more torque, the constant pounding ensures the screw will make it through the material.
Conversely, impact drivers have the power to loosen them up while not stripping those heads - which you already knew if you were paying attention.
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