STI Prep/Master 2420 Floor Grinding Machine (electric)


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Ideal for Polishing Projects up to 5,000 SF (500 M2)

The STI-2420 floor grinding machine is designed for medium-sized commercial or residential projects. This machine combines the production capacity of a larger machine with the maneuverability of a smaller grinder. Its 20HP motor has strong torque and its variable speed drive easily adjusts to different grinding or polishing conditions for concrete, terrazzo, marble, and stone applications. Available in 230V or 480V.

The moveable pocket weight system adjusts head pressure depending upon application and the standard water tank makes it easy to switch from dry to wet work. Uses four tool plates (included). Recommended for project sizes up to 5,000 SF (500m2).

  • Working width: 24 in. (61cm)
  • 20 HP (14.7kW)
  • 1 or 3 phase
  • Available in 230V or 480V
  • 4 tool plates (included)
  • Uses 12 tools

Learn why the STI-2420 is the best choice for large commercial projects


Additional information

Weight 978 lbs
Dimensions 75 × 24 × 50 in

230v, 480v

Spec Sheets

STI 2420 Spec Sheet

STI Brochure PM Grinders