STI Electric Concrete Floor Grinder 24″
STI Electric Concrete Floor Grinder 24″ is a professional-grade surface-preparation and polishing machine engineered to deliver maximum productivity for commercial and industrial flooring projects. Featuring a 24-inch grinding width and a powerful 20 HP (14.7 kW) WEG electric motor, available in 230V or 480V with single- or three-phase configurations, this grinder provides exceptional torque and consistent performance for demanding concrete grinding, polishing, coating removal, and surface preparation applications. Its variable-speed drive, adjustable pocket-weight system, and integrated water tank allow operators to optimize grinding pressure and easily switch between wet and dry operation, while the four included tool plates support 12 tools for efficient multi-head grinding.
Designed for projects up to 5,000 sq ft (500 m²), the Prep/Master 2420 combines the production capacity of large floor grinders with the maneuverability of a compact machine, making it easy to transport and operate on job sites. Measuring 75″ L × 24″ W × 50″ H and weighing approximately 978 lbs, it is ideal for concrete grinding and polishing, epoxy and coating removal, terrazzo finishing, adhesive and mastic removal, and stone or marble polishing. Offering lower emissions for indoor applications, eliminating propane fuel handling, and maintaining reliable performance in controlled environments, the Prep/Master 2420 is fully compatible with STI tooling systems and delivers the productivity, versatility, and finishing quality professional contractors demand.
Applications
- Concrete grinding and polishing
- Epoxy and coating removal
- Terrazzo surface finishing
- Warehouse and commercial floor preparation
- Adhesive and mastic removal
- Stone polishing
- Marble polishing
Electric Concrete Floor Grinder 24″ Main Features
- 24″ grinding width for efficient surface coverage
- Powerful 20 HP (14.7 kW) WEG electric motor
- Available in 230V or 480V
- Single-phase or three-phase configurations
- Variable speed drive
- Adjustable pocket weight system
- Built-in water tank for wet or dry grinding
- Includes 4 tool plates supporting 12 tools
- Compatible with STI tooling systems
- Designed for projects up to 5,000 sq ft (500 m²)
- Lower emissions for indoor use
- Easy to transport and maneuver
- Ideal for concrete, terrazzo, stone, and marble surfaces
STI Electric Concrete Floor Grinder 24″ Specifications
| Property | Value |
|---|---|
| Model | Prep/Master 2420 |
| Working Width | 24″ (61 cm) |
| Motor | WEG 20 HP (14.7 kW) Electric |
| Voltage | 230V or 480V |
| Power Configuration | Single Phase or Three Phase |
| Variable Speed | Yes |
| Tool Plates | 4 |
| Total Tool Capacity | 12 Tools |
| Water Tank | Integrated |
| Operation | Wet or Dry |
| Adjustable Weight System | Yes |
| Recommended Project Size | Up to 5,000 sq ft (500 m²) |
| Dimensions | 75″ L × 24″ W × 50″ H |
| Weight | Approx. 978 lbs (444 kg) |
| Compatible Tooling | STI Tooling Systems |
Electric Concrete Floor Grinder 24″ Video
The Best Floor Grinders for Large Projects | Prep/Master 2420 & 2418LP
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