Rotary hammers have a more powerful impact, offer faster drilling rates of 12…17 in/min (5…7 mm/s) and drill up to 1-3/16” holes into hard concrete. In short, hammer drills have a weaker impact, drilling rate below 5 in/min (2 mm/s), and are practical only for drilling a few holes 1/4” (6 mm) or smaller into strong concrete. In this article, I am going to tell you the bottom line difference between impact drills and rotary hammers. But they are called different because they generate the impact in different ways, and rotary hammer is the one with more impact power – most web sources will tell you this much.īut how much more powerful rotary really hammers are? And what are all the other differences besides the hammer mechanism? If you are considering which tool to get, you are probably interested in the bottom line: how well each drills into concrete, and what else can they do. The tools work just the same: knock and rotate the bit. When drilling small holes to concrete, you have two tools to choose from: a hammer drill (impact drill) or a rotary hammer.
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