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Impact Driver Basics

Clear explanations of how impact drivers work and what their spec sheets actually mean. Read these first if you are new to impact drivers or want to understand the numbers before you buy.

18 guides in this section

What Is an Impact Driver?An impact driver adds rapid rotational blows to drive long screws and bolts without strain. How it works, what it is for, and when you need one.
How Does an Impact Driver Work?Inside an impact driver: the hammer, anvil and spring that turn motor power into rapid rotational blows, and why it drives screws so easily.
What Is an Impact Driver Used For?From deck screws and lag bolts to cabinet installs and seized bolts, here is what an impact driver is actually used for, and what it is not.
Impact Driver Torque ExplainedWhat in-lbs ratings really mean, why spec-sheet torque can mislead, and how much impact driver torque you need for screws, lags and bolts.
Impact Driver IPM vs RPMIPM, RPM and BPM on impact driver spec sheets explained, how they affect driving speed, and which number matters most for your work.
Brushless vs Brushed Impact DriverBrushless impact drivers run cooler, longer and stronger. See the real differences in runtime, power, size and price, and when brushed is fine.
Impact Driver Speed Settings & ModesSpeed 1, 2, 3, assist and self-tapping modes explained, with a quick chart showing which setting to use for each screw, bolt and material.
Can You Drill With an Impact Driver?You can drill with an impact driver using hex-shank bits. Learn which holes it handles well, where a drill is better, and which bits to use.
Can an Impact Driver Remove Lug Nuts?Some impact drivers can break loose lug nuts with an adapter, but many cannot. See torque numbers, the risks, and when you need an impact wrench.
Do I Need an Impact Driver?Not everyone needs an impact driver. Use this decision guide based on your projects to see if a drill alone is enough or an impact driver pays off.
Hydraulic Impact Drivers ExplainedHydraulic (oil-pulse) impact drivers are much quieter and smoother than standard impacts. How they work, the trade-offs, and which models exist.
How Loud Is an Impact Driver?Impact drivers commonly exceed 100 dB while impacting. Learn typical noise levels, why hearing protection matters, and quieter alternatives.
Impact Driver Safety RulesPractical impact driver safety: eye and hearing protection, bit selection, hand position, overtightening, battery handling and safe storage.
Cordless vs Corded Impact DriverCorded impact drivers still exist and cost less up front. Compare power, runtime, convenience and long-term cost against cordless models.
12V vs 18V Impact DriverCompare 12V and 18V/20V impact drivers on torque, size, weight and runtime, and see which jobs 12V handles and where 18V is worth the bulk.
18V vs 20V Max: Is There a Difference?20V Max and 18V tools use the same battery chemistry and nominal voltage. Here is why the labels differ and what actually matters when comparing.
Impact Driver GlossaryEvery impact driver term in plain English: anvil, cam-out, collet, IPM, torsion zone, oil-pulse, Ah, brushless, T-mode, hex shank and more.
Manual Impact DriverA manual impact driver turns a hammer blow into twisting force to free seized and rusted screws. How it works, how to use it and what to buy.

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