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Model # 390K

Internet # 203054714

5 in. Low Profile Random Orbit Sander

This item has been discontinued.
The Home Depot no longer carries this specific product.

$109.00 /box




Model # 390K

Internet # 203054714

Store SO SKU # 1000397846

The Porter Cable 390K Low Profile 5 in. Random Orit Sander Kit is ideal for surface preparation for coating, smoothing seams and removing paints, varnish and old coatings. The sander has a 3.5 Amp EnduraTech Motor with a variable speed dial providing 7,000-12,000 orbits per minute to enable users to control the removal rate and cater towards the application. The sander has Electronic Load Control providing 42% faster material removal. It includes a mechanical brake pad to reduce free-spin which virtually eliminates gouging. The low profile design reduces the sander height by 31% allowing for better control and finish. The 390K includes: sander and kit box.

  • 3.5-amp EnduraTech motor for increased performance and durability
  • Electronic load control for 42% faster material removal
  • EnduraTech motor technology has 71% fewer wear components for 5-10 times longer motor life
  • Electronic motor brake reduces spin-down time by 73% for increased productivity
  • Mechanical pad brake reduces free-spin to virtually eliminate gouging
  • Low profile design reduces sander height by 31% for better control and finish
  • Variable speed dial, 7,500 - 12,000 OPM optimizes removal rate on a variety of materials
  • Optimized ergonomics with rubber grip for comfort and control
  • Integral dust port accepts 1 in. and 1-1/2 in. vacuum hoses for optimal dust collection
  • 3/32 in. orbit diameter

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Amperage (amps) 
Case Included 
Color Family 
Cord Length (ft.) 
Corded Tool Type 
Disc Sander 
Dust collection type 
Maximum Speed (rpm) 
Power Tool Product Type 
Product Weight (lb.) 
6.34 lb 
Random orbit 
Tools Product Type 
Power Tool 
Variable Speed 
Warranty / Certifications
Certifications and Listings 
CSA Listed 
Manufacturer Warranty 
3 Year Limited Warranty 1 Year Free Service Contract 90 Day Money Back Guarantee 


Rated 4.6 out of 5 by 12 reviewers.
Rated 5.0 out of 5.0 by Great sander if you have a large hand I am a professional antique restorer and use a sander on a continual basis. If you have a hamfist hand to palm this sander, it is excellent. My hand is a normal mens large and it is just a bit big for my taste. What I like about it most is the low felt vibration and how fast it stops turning once you shut it off. Once I hit the off switch it stops before I can even set it down. Vaccuum port is a real plus. As a big Porter fan this one is a good one! January 24, 2012
Rated 5.0 out of 5.0 by Lighter, easier to use and with a clutch Upgraded from a long-lasting Porter Cable standard random orbital to this low-profile one. Significantly more expensive but so far worth it. Much lighter – though still not totally ergonomically comfortable – and easier to control than the last model (the basic PC-382). The clutch makes it quick to go off which is very nice when you're done sanding, though there is a strange slight delay on startup. The receptacle for the sawdust is better than the hard plastic version (which is basically worthless), though much more difficult to get on/off. I like the way it latches, but it's for strong hands. It's only been used a handful of times, but so far I love it. May 22, 2012
Rated 4.0 out of 5.0 Best electrical sander I've tried Overall a very good sander. Easy to control and excellent dust collection. This sander has plenty of power and won't try to run away. I still prefer the air sanders but since they require a nuclear powered air compressor they are not appropriate for job sites. This sander sits low but is a little big for my hand and the switch is hard to reach one handed but don't let that stop you. It's a little pricy compaired to other name brands but the minute you turn it on you'll be glad you spent the extra. Don't pay extra for the case unless you plant to transport it a lot. July 18, 2012
Rated 4.0 out of 5.0 by Great tool- little awkward The sander has preformed well so far compared to the other three sanders I have tried. The low profile design is a little awkward and takes some getting used to. I end up holding the sander by the dust collector instead of the to control it. But to date it has out performed the other sanders I have purchased. March 13, 2012
Rated 5.0 out of 5.0 by Very good balance & smooth motor This new sander was ready to go right out of the box. The variable speed has already been a big improvement on various materials, such as softer PVC trim which will heat up with high rpm. Soft start feature is a big bonus, as I've been putting up with standard "hang on and go" sanders previously. There have been some comments about the wide power head, but I don't find it an issue. What I do appreciate is not having a top-heavy housing as I work on many off-angle exterior trims and mouldings, so balance is key. June 18, 2013
Rated 5.0 out of 5.0 by This is an excellent product which I highly recommend. The dust pickup was very good (most of my previous sanding was with a ¼ sheet pad sander and it hardly picked up any dust at all). I have used both Bosch and Porter Cable H&L discs and they both stay on the sander very well. I have not had any discs slip. I used a pack of 60-120-240 grit discs and they worked great for taking the old finish off the old deacon’s bench I am refinishing and preparing for stain. You can easily feel the difference each time you change grits. The hard plastic case not only protects the sander, it has enough room for extra packs of sanding discs. My hand felt fine holding and maneuvering the sander, but I can see where different hand sizes might have a problem. My only complaint (and it is very minor): the power cord should be longer. You will probably wind up using an extension cord. Don’t forget to wear hearing protection. Like every sander I have ever used, it is loud. The price was good and it shipped promptly. September 5, 2013
Rated 5.0 out of 5.0 by Great Orbital Sander I had a B&D "two in one" orbital sander for about 18 months before it died. I never did like the B&D because it walked so much; it was really hard to control. I decided I'd try a Porter-Cable because of their reputation. I 'm glad I got it. This thing works great. The pad brake works well so you don't have to worry about gouging when you first set it on the wood. The only negative is the size of the handle - I've got average size hands and the handle is just way too big. The dust catch system is the best! My old B&D used a pleated paper filter that seemed to let about half of the dust go through it. Not this P-C! The cloth bag does a great job of catching dust. It's much, much better than the B&D. I would definitely recommend to anyone in the market for an orbital sander. February 2, 2014
Rated 4.0 out of 5.0 by Great Value (But made in Mexico) I have only used it a few times, but hooked to a standard shop vac, there is very little dust. The sander performance is similar to others I have used. I do like the quick braking of the pad and I have no ergonomic issues with it. The 4 stars is because it is probably made with slave labor. January 23, 2014
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