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Model#: MKTN9903

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New items with possible minor cosmetic damage; CPO 120 day money back guarantee
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Makita 9903 3 in. x 21 in. Belt Sander

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Powerful 8.8 Amp motor - quietest in its class.
Variable speed (690-1440 ft./-min.) with electronic speed control.
  • Quietest sander in its class (85dB)
  • Auto-tracking belt system tracks belt without adjustment
  • Unique design allows flush sanding to the corner of the wall with nose and side of sander
  • Front grip design for comfortable operation
  • Dust bag for a cleaner work environment
  • Optional sanding shoe available for precise sanding depth control
  • Sands wood or metal and removes paint and rust
  • Long 16.4 ft. power cord for easy maneuverability
  • Double insulated
  • 3 in. x 21 in. Belt Sander - 9903
  • Abrasive Belt #80 - 742308-3
  • Operating Manual
  • Dust Bag - 122591-2


Length: 11.625 in.
Weight: 9.5 lbs.
Batteries Included: 0
Shipping Weight: 11.75 lbs.



4.6 / 5.0
5 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (4)
Powerful (5)
Easy To Use (1)
Best Uses
Frequent Use (2)
Large Projects (1)
Easy To Use
Best Uses
Large Projects
Thumbs Up!!
Excellent tool. Good quality and performance.
September 23, 2018
2 months ago
Describe Yourself:
Avid Do-it-Yourselfer
Yes, I would recommend this to a friend
Excellent piece of machinery
This tool handled my small sanding projects with ease. The stock belt is not very good, but when outfitted with a Diablo belt it really performed well. Belt tracks and stays adjusted, it is easy to handle and has plenty of power even when loaded down with a bit of pressure. Dust collection seems exceptional. Makita sanders are tops in my opinion, a bit more pricy but worth the cost.
October 5, 2013
Yes, I would recommend this to a friend
Good Sander
Good sander with quality controls. Variable is nice, belts tracks easily, easy to replace. The only ding is it being a 3x21. Returning for a 4x24, that little extra bit makes a big difference on the job. Other than that a quality Makita product I would recommend to anyone doing any type of DIY project.
December 11, 2011
Yes, I would recommend this to a friend
Best Uses
Frequent Use
Great product
Easy to use, works very well on Glass fab
May 20, 2011
Yes, I would recommend this to a friend
Best Uses
Frequent Use
Walks the talk
In carpentry & painting a belt sander is indispensable. In professional duty this sander is the best I've ever used. Efficiency & sustainability are key when being paid for your time. Customers expect the best in the fastest time possible. I am very satisfied with this sander. The balance is exceptional and sanding in close is simple. Belt changing takes seconds and it practically tracks itself. I am amazed! Wish I had gotten so much sooner, but I use my tools till they can't hold up to the task at hand. Should have started with a Makita but I didn't if you're looking to replace yours don't wait! You'll be glad you own this Makita.
September 14, 2010

Questions & Answers

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I am looking for the shoe or what ever it is called that fits on the 9903 sander to prevent gouging. I saw it once in the corner of the page when I ordered the sander and now I can't find it. It is a big plate that goes on the bottom of the sander. Can anyone help me?
Terry D on Dec 19, 2016


Warranty Information

Makita Standard Warranty

The Makita Standard Warranty applies to both new and factory-reconditioned Makita tools. Every Makita tool is thoroughly inspected and tested before leaving the factory. If you are not satisfied with any Makita tool within 30 days of purchase, return it and Makita will provide a replacement or refund. Each Makita tool is warranted to be free of defects from workmanship and materials for the period of ONE YEAR from the date of original purchase. Should any trouble develop during this one-year period, return the COMPLETE tool, freight prepaid, to one of Makita's Factory or Authorized Service Centers.

Each NEW Makita Lithiumā€Ion Power Tool, Battery and Charger is warranted to be free of defects from workmanship and materials for the period of THREE YEARS from the date of original purchase

If inspection shows the trouble is caused by defective workmanship or material, Makita will repair (or at its option, replace without charge).

This Warranty does not apply where:
  • Repairs have been made or attempted by others
  • Repairs are required because of normal wear and tear
  • The tool has been abused, misused or improperly maintained
  • Alterations have been made to the tool
In no event shall Makita be liable for any indirect, incidental or consequential damages from the sale or use of the product. This disclaimer applies to both during and after the term of this warranty. Makita disclaims liability for any implied warranties, including implied warranties of "merchantability" and "fitness" for a specific purpose, after the one-year term of this warranty. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.