Porter-Cable 390 5-Inch Low Profile Random Orbit Sander

By Robert Robillard on Tool Reviews

Porter-Cable Random Orbit Sander

The Porter-Cable 390 5-Inch Low Profile Random Orbit Sander is a powerful palm sander that has a low center of gravity for better control and handling as allows you to getting the sander into tight spots.
I’ve always used random orbitals because they sand so nicely across the grain!

Porter Cable  recently sent me their 390 low profile 5″ random orbital sander to evaluate. I’m a big fan of Porter Cable sanders and own four of them.

First Impression:

The very first thing I noticed was how much smaller the 390 was to my old Porter Cable sander. The 390 was reduced 31% in height. It’s lightweight and very manageable.

Motor And Speed:

This sander was designed the 390 with a EnduraTech Motor Technology which is touted to have 71% fewer wear components, that translates into a 5 to10 times longer motor life.  An electronic motor brake reduces spin-down time by 73% . It has a variable speed dial that allows speed adjustments from  7,500 to 12,000 rpm which helps customize your sanding approach on a variety of materials.

A built in pad break prevents this sander from over-speeding [free-spin] of the sanding pad.  this means when you life the tool off your work surface the pad rotation is reduced to 500 rpm

Dust Collection:

The Porter-Cable 390 5-Inch Low Profile Random Orbit Sander has a dust container as well as an integral dust port which accepts 1″ and 1-1/2″ vacuum hoses for optimal dust collection.  I easily connected my work shop hose from my shop vac to the sander.


The Porter Cable 390 is super comfortable to use and it’s low-profile design is shorter than previous older models as well as the competition. This translates into better control of the tool, better access into small spaces and less fatigue with over head sanding operations.


The Porter Cable 390 uses 5″ [127 mm] hook and loop sanding disks with an 8 hold dust extraction pattern.

Warranty Information:

The 390 is backed by a one-year service free and 90 day money back warranty.

What’s in the Box

  • Random-orbit sander kit,
  • 5-inch hook-and-loop pad with eight-hole pattern,
  • rugged storage case,
  • user manual.

Using the Porter-Cable 390 5-Inch Low Profile Random Orbit Sander:

I used the Porter Cable 390 sander to build three built in window seats in the shop and then install them in the field.  The 390 worked great and was fast at removing material if needed.

Overall Impression:

WOW ~ what a difference from my old random orbital sander.  The 390 is smooth, lightweight and powerful enough to use on all types of professional,  carpentry and Do-It- Yourself projects.  highly recommended!

How much and where to buy:

The Porter-Cable 390 5-Inch Low Profile Random Orbit Sander sells for $99.00 online here:


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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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