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Substrate Technology, Inc. Prep/Master 2420 Floor Grinding Machine Working width: 24 in. (61cm) For projects up to 5,000 SF (500m2) Electric motor: 20 HP (14.7k.. Product #: 432420230 based on 0 reviews

Prep/Master 2420 Floor Grinding Machine

Brand: Substrate Technology, Inc.
Weight: 978.00lb
Dimensions: 75.00in x 24.00in x 50.00in

Prep/Master® 2420 Floor Grinding Machine (Electric)

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

See the STI-2420 Prep/Master Machines in Action


Contractors choose Prep/Master for its Durability. Here is how STI does it!

Item Numbers
Item # 432420230 = 2420 (220V/230V)
Item # 432420480 = 2420 (380V/480V)
Machine Specs - Electric
Coverage 5,000 SF (500 m2)
Motor 20 HP - 3 phase (14.7kW)
Power Source 220/230 VAC 1 or 3 Phase, 60Hz or 380/480 VAC 3 Phase, 50-60Hz
Power Cord 30 ft. (9m) | 8-4
Dimensions 75 L x 24 W x 50 H in. (191 x 61 x 127 cm)
Working Width 24 in. (61 cm)
Weight 978 lbs (444 kg)
Tools RPM 300-750 RPM variable
Tools Needed 12
Tools Attachment Style EG Attachment System
Vacuum Hose Connection 3 in. (76 mm) (sold separately)
Recommended Vacuum PM3003AR
Production Rates
Mastic Removal 475 SF (45 m2) per hour
Thin Set Removal 525 SF (50 m2) per hour
+/-25 Mil Coatings 325 SF (30 m2) per hour
Concrete Polishing 925 SF (90 m2) per hour
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