April 11, 2021

Dewalt 6421 vs 6423 | What Random Orbit Sander is Better

While looking for a random orbital sander, you may need to compare the Dewalt 6421 vs 6423. Having worked with Dewalt tools and random orbital sanders for years, I have much to contribute to this topic. The most important factors you should look for in these tools include power, speed, dust extraction, weight, cost, and design. I recommend that you tailor these items to your needs. In this article, we will learn more details about these tools.

Overview of the Dewalt 6421

The Dewalt dwe 6421 is a 5-inch random orbit sander with a 3 Amp motor. The orbital sander spins the pad at a maximum speed of 12,000 OPM. The sander has a counterweight design that reduces vibration during operation. That ensures you a comfortable experience when you are handling the electric sander. 

The sanding machine has rubber in its critical parts. You hold it from different positions that are convenient. The hand sander has a shorter height. You have visibility of the activities taking place. The improved dust switch protects your sander and your health system from dust. 

That makes the hand sander last longer. The dust collection system is effective. And the one-handed locking dust bag makes the process easy to control. The dust port is connectable to universal dust collectors. This allows you to attach it to vacuum systems. The Dewalt 6421 weighs up to 3.4 pounds. The package includes the Orbit sander, dust bag, and a user manual.  A skirt around the disc makes it efficient in dust collection.


  • Comfortable
  • Versatile 
  • No vibration
  • Shorter height
  • An improved dust collection system


  • Single-speed
  • The dust bag needs regular emptying

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Key Features of the Dewalt DWE6421

Dust collection system

The hand sander has improved dust–sealed switch that protects the machine from ingesting dust. The dust port fits the DWV010 or the DWV012 dust collectors. An extendable dust extraction system that includes vacuum systems is more efficient. You connect the port to a 1-1/4inch horse or use the DWV9000 Universal Quick Connector. A vacuum cleaner will give you the best dust management feature. That does not mean the dust canister is insufficient, but it tends to lose some dust particles when the sander lacks a horse. The dust bag fills up, and it needs regular emptying. 

Power and speed

The hand sander has a fixed speed of 12,000 OPM, which might disadvantage a user who prefers speed variance. However, that keeps your speed limit constant in different materials. It helps you master your speed since you have a single speed. The 3amp motor is powerful enough to speed the pad at such a high speed.

Great grip

The top part and the rest of the body have an anti-slip grip. That allows you to hold the sander with comfort and confidence. You have control over when the sanding machine is operating. The anti-slip grip also prevents your hand and body from a low vibration. In that manner, you hardly feel fatigued after a long work day.

Hook and loop system

The hook and loop system makes sanding pads easy and quick to change. When attaching the sanding pads to the sanding disc, you must match the holes from both sides and press firmly. A clicking sound will assure you that they are correctly attached. 

Sanding pad

The sanding disc is 5 inches in diameter. It is round in shape and ideal for straight and flat surfaces. It does not fit in tricky places such as corners.

Overview of the Dewalt 6423

The Dewalt DWE 6423 is a 5-inch variable-speed random orbit sander. It has a 3 amp motor produces 8,000 to 12,000 Orbits per minute. The speed variance allows you to control the speed depending on the type of material you are working on. The separate counterweight makes the machine withstand the vibration. 

You do not feel the vibration in your arms. That gives you a comfortable experience without being irritated. The dust bag allows you to use one hand. In that case, the rubber grip makes handling the machine comfortable. The low-profile design allows the user to get closer to the sanding device. That feels comfortable even if you are short or tall. Trying to reach out to a tall machine is straining, and you will not be comfortable. 

It is easy to remove and clean. Your environment stays dust-free. The sander is ideal for woodwork. It is a good sander for the money. The machine has an orbit diameter of 3/32 inches. The dust port is a bit difficult to connect to the hole. Using a Dewalt vacuum system makes it better. However, rubber tubing to the vacuum improves the system. The sander runs smoothly, with the slightest vibration that gives you a professional and flawless finish. 


  • Speed variance.
  • Works great on both rough and finish work.
  • Sanding pads are easy to replace.
  • Minimal vibration.
  • An improved dust collection system.


  • The dust port is hard to connect to the hole.
  • It vibrates a bit.

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Key Features of the Dewalt 6423

Amp motor

The 3 amp motor has the power to spin the pad at 8,000 up to 12,000 OPM. That allows it to work on materials faster. That makes the machine ideal for industrial tasks. You are quick to finish your workload. 

Dust collection system

The machine has a locking dust bag that connects to the sander. The dust bag is easy to handle as you can secure it using one hand. The dust bag is connected directly to the DWV010 or DWV012. These are Universal Quick Connectors. The machine lasts long due to the improved dust-sealed switch that protects the machine from ingesting dust. The dust port is compatible with vacuum systems that have 1-1/4inch hoses.

Hook and loop pad

 The hook and loop pad help you change sanding sheets. The hook and loop are 5 inches in size. The tool is 5.5 inches long, and the machine weighs up to 2.9 lbs. The package includes a variable-speed random orbit sander and a dust bag. 

Rotations per minute

The Dewalt DWE 6423 produces 8,000 to 12,000 OPM. That is a faster rate on multiple materials. It works on rough and finishing surfaces. As a user, you have control over the sander machine. The orbits per minute with the Dewalt 6423 make it aggressive. Lower speeds are ideal for soft and thin materials, whereas higher speeds are ideal for long and thicker materials. 

Disc size

The standard disc for the orbital sander is 5inches in diameter. These are sandpaper discs. You can find them in hardware shops. When you are working on large projects, bigger sizes will do. 


  • They both have a powerful 3 Amp motor.
  • They have a low vibration rate due to the counterweight design.
  • They have a grip due to the rubberized body.
  • They both have a short height that brings the sanders close to the user.
  • They come with dust bags.
  • They both connect to a vacuum.


  • The Dewalt DWE 6421 has a fixed speed of 12,000 OPM, whereas the 6423 has a speed variance of 8,000 to 12,000 orbits per minute.
  • The Dewalt 6421 is more affordable than the DWE 6423.


Both products fall within the same price range. However, the Dewalt 6421 is more affordable than the DWE 6423 model.

Verdict on the Dewalt dwe6421 vs dwe6423

There are more similarities between the Dewalt 6421 and the Dewalt 6423. They have the same type of motor, the same dust collection system, the same design, and the same height. The difference is in cost and speed. If you want a variable speed sander, the Dewalt DWE 6423 is the ideal product. The Dewalt DWE 6421 has a fixed speed. A tight budget is for the Dewalt 6421; I am sure you have already decided on one after the above review.

David D. Hughes

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