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Bosch GSS20-40 1/4-Sheet Orbital Finishing Sander

Flush sanding ability lets you sand along vertical surfaces without gouging.
Item #
80% of 100

The Bosch GSS20-40 1/4-Sheet Orbital Finishing Sander delivers even sanding and long tool life, with a precision-machined aluminum sanding plate. It has a beefy 2.0-amp motor that produces up to 12,000 oscillations per minute (OPM), delivering uniform results on all surfaces. This tool incorporates low-vibration engineering for user comfort and enhanced tool life. It features the traditional sanding sheet clamp design, for dependable grip of one or more sanding sheets (it also accepts stick-on paper). Ideal for finish carpenters and other pro users, the GSS20-40 features through-the-pad dust collection and a microfilter dust canister with a screw-off cap. An integrated paper filter in the canister traps particles as small as a half micron. The sander offers flush sanding on three sides, so the user can sand along inside corners without gouging the perpendicular surfaces. The tool also provides an ergonomic soft-grip top for user comfort.


  • Precision-machined aluminum sanding plate for even sanding and durability
  • Powerful 2.0-amp motor with 12,000 OPM speed for fast, smooth results
  • Microfilter dust canister collects fine dust—screw-off cap offers easy emptying
  • Low-vibration design provides comfort and stable handling
  • Ergonomic soft-grip top for stable handling and extended comfort
  • Dust-sealed switch fends off contamination from dust and other debris
  • Through-the-pad dust collection for a cleaner workshop
(1) Bosch GSS20-40 1/4-Sheet Orbital Finishing Sander
(1) Punchplate
(1) Sample Sandpaper Sheet
(1) Microfilter Dust Canister
More Information
Brand Bosch
Manufacturer Part Number GSS20-40
Weight 3.7400
Tech Spec
  • Amperage: 2.0
  • Dust Collection: Yes
  • Length: 10.0''
  • Width: 4.0''
  • Working Length: 4-1/2''
  • Microfilter Canister Efficiency: Up to 75%
  • No Load OPM: 12,000
  • Pad Size: 4'' x 4-1/2''
  • Voltage: 120V
4.0 / 5.0
1 Review
5 Stars
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1 Star
Bosch GSS20-40
Sander came earlier than expected and in great condition. I always did my final sanding by hand but no more! Sander is very easy to handle with one hand, super finish with 120 grit. I recently purchased a Bosch router and I have been very impressed with the quality of their tools, I would recommend them to anyone.
May 28, 2019
6 months ago
Woodworking Experience:
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Browse 2 questions Browse 2 questions and 3 answers
Why did you choose this?
Rockler Store
Like the product bosch
David Z on Nov 4, 2019
Like the product bosch
David Z on Nov 4, 2019
My old bosch sander broke after 9 years. Part on order.
Charles K on May 4, 2019
My old bosch sander broke after 9 years. Part on order.
Charles K on May 4, 2019
Can this be connected to a shop vac?
Roy S on Jun 25, 2017
BEST ANSWER: The picture above shows it connected to a hose