
Like a typical drill, an impact driver relies—at least initially—on the tool's motor and gearing to turn the chuck for drilling or driving. When the going gets tough, though, an impacter switches modes to engage the hammer-and-anvil system, shown below, to kick its rotational power into overdrive. In impact mode, the chuck rotates much slower but with much greater torque.1
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In general, high torque applications require lower hardness levels to withstand twisting and resist breakage. The more a driver bit flexes during rotation, the more it absorbs impact.
1Wood Magazine - Wood Magazine -Tool Feature: Cordless Impact Drivers
2S2 Modified Steel – All Vega bits are made from shock resistant S2 modified steel and have a Rockwell hardness of between 58-62 HRC. S2 Modified steel is the most durable material for the performance required by our professional end users.
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