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Bosch GWS18V-45C 4.5″ Angle Grinder vs DEWALT vs Milwaukee vs Hitachi

Best Angle Grinders

How do we know what tool is better than another?  We use them and set up real-world tests to help you make your decisions!  In this article, we are looking at the new Bosch GWS18V-45C 4.5″ Angle Grinder and comparing it to the DEWALT, Milwaukee Tool, and Hitachi to see how it stacks up.  The Dewalt angle grinder we are using is the FlexVolt 60-volt and that is a much larger and more powerful unit, but it was worth adding it in for comparison in runtime.  If you watched the YouTube video, there was some surprise in the runtime of these angle grinders.

The new Bosch GWS18V-45 angle grinders come in three different configurations.  They have a slide lock switch or paddle switch and a third model that comes with the Bluetooth connect unit.  The paddle switch models have three different settings to allow you to vary speeds.  At some point in the future, we will start to go over the Bosch Tool Box App and the features that come with connecting to your Bosch Power Tools.

GWS18V-45 Features

  • Bosch’s most powerful cordless, connected-ready angle grinder
  • EC Brushless motor – delivers greater runtime, has the capacity to transfer up to 35% more power and up to 110% more runtime with an optional CORE18V battery
  • Connected-ready works with the optional Bosch GCY30-4 Bluetooth connectivity module to deliver next-gen user control and customization
  • Drop control – shuts the grinder off after accidentally dropping the tool on the floor
  • KickBack Control features an electronic sensor to reduce the hazard of sudden tool reactions in binding conditions
  • Restart protection prevents the tool from accidental start-up during battery insertion
  • Soft-start technology reduces start-up torque to ease into cuts
  • Two-position Vibration Control side handle
  • Burst-resistant wheel guard
  • Electronic Cell and Motor Protection  protects the tool and the battery from overheating and overload
  • Large spindle lock
  • LED light

How Does It Compare?

In our test, we brought in a newer Hitachi with an 18-volt 6.0Ah battery, the Milwaukee M18 FUEL with 5.0Ah battery, and the DEWALT FlexVolt that is a 60-volt battery with 2.0Ah.  The Bosch angle grinder uses the CORE 18-volt 6.3Ah battery that is supposed to help this grinder perform to the max.  Our tests were simple and based on what normal users would do in the field, grinding welds, cleaning up surfaces to welds and cutting smaller pieces of metal.

The user of the tool can feel power differences, but describing them is fairly difficult.  We feel that each of these tools would make most users happy, but there are differences.  In our cutting test, with each grinder sporting a new Bosch cutting wheel, we found the Hitachi to be the slowest cutting through our metal bar at 23 seconds to complete the cut.  Milwaukee and Bosch completed the cut with an average of 17 seconds and the Dewalt FlexVolt made the cut in 11 seconds.  There is a significant difference between the top and bottom grinders.

While grinding welds, the Hitachi was able to run for two minutes before the battery was drained.  The Bosch, Milwaukee, and DEWALT all lasted 3 minutes 30 seconds in that test before wanting a recharge.  That is a surprise to us as it is a very short runtime.  In our normal shop use, we do not see that short runtime because our uses are short and the batteries are able to recover slightly between uses.  There was no doubt that the DEWALT was the king of power and was able to complete the most work in the runtime test, but the Bosch and Milwaukee were neck and neck throughout the full test.

Bosch really stepped up their game with this new grinders as they could have never kept up to the models we compared it against in the past.  Check out our video to really see the differences!

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