DeWalt DWE6421K vs DWE6423K vs Bosch ROS20VSC Orbit Sander

When it comes to palm sanders, Bosch and DeWalt stand out in the market for their engineering and user-friendly features.

Both brands have attracted woodworkers and contractors for generations because of the uncompromising quality of their power tools. For this review, we’ll be putting three random orbit palm sanders from these companies and comparing them.

These DeWalt and Bosch palm sanders are competing in the mid-tier price range and without a doubt the products they’ve introduced in the market here are high-value at the price point they’re being sold at.

If you’re a fan of the two brands and are asking what palm sander of the two companies you should go for, please check out our review below.

Quick Summary

In this review, we’re taking a look at three random orbit palm sanders. Random orbit sanders give surfaces great surfaces without the swirl patterns that compromise finishes.

The DWE6421K powers up to 12,000 orbits per minute right off the bat and its single speed setting is perfect for users who just want to work on surfaces without fiddling on settings.

Contractors, on the other hand, who need to work on a variety of surfaces like painted walls, metal, or wood, require variable speed settings. This makes the DeWalt DWE6423K a good investment since it can take these kinds of work on through its variable speed settings.

For woodworkers who want a touch of flair on their projects, the Bosch ROS20VSC will deliver really great finishes on furniture and surfaces.

DeWalt DWE6421K vs DeWalt DWE6423K vs Bosch ROS20VSC: Which is the Best Pick?

DeWalt DWE6421K

DEWALT Random Orbit Sander, 5-Inch (DWE6421K)Dust Protection and Collection

Many sanders develop issues powering up after sawdust enters the slits at the sides of the power button. Fortunately, the DeWalt DWE6421K sports a dust-sealed switch that prolongs the usable life of the sander by preventing sawdust from coming in.

This sander also comes in with dust collection channels just below the sanding pad. As the sander moves, the channels vacuum the dust generated by the sandpaper polishing the surface.

The one-hand locking feature allows users to easily remove the dust bag and lock back in after emptying it of sawdust.

User-Friendly Design

Thanks to the rubber overmold design, the DWE6421K lends itself to one-hand operation. Users can easily grip the top of the sander and use the other hand to keep the project surface steady.


Upon switching the DWE6421K on, they’ll instantly feel the sander rev up to 12,000 orbits per minute and help them quickly get to work finishing their surfaces. The power and the random movements of the sander guarantees a beautiful scratch-free surface in a short amount of time.

What We Like

  • Hook and loop system allows easy replacement of sandpaper and accepts a wide array of sandpaper with different grits
  • The well-balanced form factor makes it easier for users to work surfaces while exerting light pressure on top of the sander.
  • Random orbit movements from the sander provide great surfaces without the spiral skid marks.

What We Don’t Like

  • Fabric can build up on the sanding disc, causing sanding paper to not stick to the pad and fly right off.

You can sand the sanding disc in order to remove the fabric build-up or you can buy a new sanding pad.

DeWalt DWE6423K

DEWALT Random Orbit Sander, 5-Inch (DWE6423K)

Lightweight and Compact

The DeWalt DWE6423K’s frame weighs around 4 lbs and its relative lightness allows users to easily carry the sander around the workshop or above their project’s surface. DeWalt designed the DWE6423K to be a compact sander, allowing woodworkers to see less of the sander and more of the surfaces they’re finishing.

Protection from Dust

Like the DeWalt DWE6421K, the DWE6423K also features the dust-protected button that preserves the operational life of the sander. You can just simply depress the button in the top forward facing side of the handle to power the sander off and on.

DEWALT Random Orbit Sander, 5-Inch (DWE6423K)


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Variable Speed Setting

When you’re stripping paint off a wall, the slowest is better than the maximum sanding speed to avoid paint strips from clogging the sandpaper. Good thing you can work the DWE6423K to 8,000 orbits per minute instead of 12,000 right off the bat so you can remove polyurethane finishes without bogging the sander down.

What We Like

  • The sander can take punishment – one reviewer used the DWE6423K to wet grind a concrete countertop for 6 days and the sander delivered.
  • Ready to use out of the box. No assembly or set up required.
  • Low-vibration performance for less arm and hand strain during sanding work.

What We Don’t Like

  • The sander does not play well with vacuum adapters from other manufacturers. 

DeWalt has a universal connector that users can buy to better connect their DeWalt DWE6423K to vacuum systems from other manufacturers.

Bosch ROS20VSC


Bosch ROS20VSC Palm Sander - 2.5 Amp 5 Inches Corded Variable Speed Random Orbital Sander/Polisher Kit with Dust Collector and Soft Carrying Bag, Blue

Finish Quality

The Bosch ROS20VSC produces well-blended and swirl mark-free surfaces through its use of a microcellular backing pad. When the sanding pad touches the surface of the project, its shape conforms to the bumps and lows of the sanding surface for a truly high-quality finish.

Sanding Flexibility

Contractors use sanders to strip paint or prep plastic finishes like ones made of polyurethane and these tasks challenge the sander since the dust or the strips stick onto the sandpaper.

The ROS20VSC’s slowest speed setting of 7500 orbits per minute gets these jobs done without issue and contractors can just bring up the speed to 12000 orbits per minute for finishing wood or metal

Bosch ROS20VSC Palm Sander - 2.5 Amp 5 Inches Corded Variable Speed Random Orbital Sander/Polisher Kit with Dust Collector and Soft Carrying Bag, Blue

Dust Collection

With the Bosch ROS20VSC, dust collection is not an afterthought. The company designed a microfilter system that captures sawdust particles as small as a ½ micron which is 10 times smaller than a red blood cell.

Experienced woodworkers may balk at the idea as a marketing system but it works in collecting dust. The sawdust also goes to a microfilter dust canister that prevents the grains from coming back out onto the project surface.

What We Like

  • The ergonomic overhand grip top provides good cushioning for users’ hands, preventing strain and fatigue while working.
  • The hook and loop system velcro keeps a tight hold on sandpapers and Bosch maintains that the velcro on the sanding pad contains 35,000 hooks for better adhesion.
  • Users can use 1-1/4 inch or 1-1/2 inch vacuum hoses with this palm sander’s dust port.

What We Don’t Like

  • Users find the microfilter dust canister cannot be easily removed or reattached back into the port.

Users should check if the dust port has a ring of sawdust around the entry and to clean it if there is. They should also check if their canister is defective if it cannot be attached easily. 

When attaching the canister fails, buyers should attach a vacuum instead as a workaround.

DeWalt DWE6421K vs DeWalt DWE6423K vs Bosch ROS20VSC: Which is Better?

After performing side by side comparisons, we found the Bosch ROS20VSC a better buy than the DeWalt DWE6421K and the DWE6423K. The Bosch ROS20VSC is better engineered for consumers than the other two on the basis of user-friendliness, performance, and dust collection.

The Bosch ROS20VSC’s frame is lighter than the DWE6423K and the DWE6421K by half a pound. It’s not something to scoff at since a power tool’s weight will make itself felt the longer one uses the tool so any reduction in weight is a plus.

The Bosch ROS20VSC’s microcellular backing pad makes sandpapers pliant to the surfaces they come into contact with. It’s a superior solution that the DeWalt sanders should come up with to produce quality finishes like their Bosch counterpart can.

While the DeWalt palm sanders’ dust collection may be decent, Bosch ensured the ROS20VSC  

Goes the extra-mile by using microfilters to absorb and trap sawdust.

Final Thoughts

Both DeWalt and Bosch offer great value with the three random orbit palm sanders they’ve put out in the market. Although we’ve taken note of how superior Bosch’s innovations are on its ROS20VSC model, users need to think about the surfaces they’re going to work on and how a sander feels on the palm of their hands.

Just choose the sander that feels right when you grip it since all three of these machines will work perfectly.