National 8274-4 Grinder

National 8274-4 Grinder


Stock: 8274-4
Disk Size: 18in.
HP: 4
Motor Phase: Single
Voltage: 115
Height: 38in.
Length: 32in.
Width: 19in.
Weight: 360lbs.


8274-4 Planetary Grinder offers patented industry leading technology. Utilizing single belt drive mechanics, this grinder is easy to maintain, transport & operate. Operating within 1/8" of the wall or edge, this grinder, in most cases, eliminates the need for hand grinding.


  • Operates within 1/8” of the wall or edge
  • Multiple applications:      
     - Aggressively removes coatings, stains, glues, mastic and other material      
     - Creates flawless uniform scratch patterns (profiles) for new coating installation as well as polished concrete
     - Polishes concrete to a mirror finish
     - Efficiently removes stains and factory applied finishes from interior hardwood flooring
     - Removes stains from exterior wood decks while simultaneously sands and profiles for new stains
     - Grinds concrete high spots into tolerance with ease
  • Self diagnosing control box
  • Variable speed gives operating control to the operator – no more blown breakers
  • Easy flip style weights for additional down pressure when required
  • Head rotates a full 90 degrees for easy & safe tooling changes
  • Three part adjustable handle (height, pitch and grip) accommodates operator of any size
  • Enough power to handle jobs both large and small
  • Offers ease of use and maneuverability into small rooms and hard to reach spaces
  • True planetary action provides smooth and effortless operation
  • Adjustable dust skirt provides dustless operation regardless of tooling
  • Accessible single belt technology with built-in tension control
  • Unique modular design for quick, easy and safe transportation
  • Forward and reverse rotations increases longevity of diamonds


National Grinder 8274-4 Data Sheet

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