Looking for an electric concrete floor grinder for your next project?
Contact us today for pricing, availability, and expert recommendations.

Speak directly with a surface preparation expert — fast answers and real recommendations.

Prep/Master Sr Electric Concrete Floor Grinder

High-Performance Concrete Floor Grinder for Residential to mid-size commercial Projects

NEW ARRIVAL!!!
We are excited to announce the Prep Master Sr to our Electric Concrete floor grinder line-up. It’s designed to give you the production capacity of a HEAVY-DUTY concrete floor grinder without the bulk.

The Prep/Master Sr concrete floor grinder is designed for professional surface preparation and polishing. It features a 27-inch grinding width and a powerful 20HP motor for consistent performance on commercial and residential flooring projects.

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).

✅ Key Features of This Electric Concrete Floor Grinder

• 27″ Grinding Width – Efficient coverage for faster production
• 20HP Electric Motor – High torque for demanding applications
• Variable Speed Drive – Adjust for grinding or polishing conditions
• 4 Tool Plates / 12 Tools – Consistent multi-head grinding performance
• Adjustable Weight System – Customize head pressure based on application
• Wet or Dry Operation – Built-in water tank for versatility

This electric concrete floor grinder is designed to combine production capacity with maneuverability, making it ideal for contractors handling mid-size jobs

🛠️ Special Features

• Heavy head pressure for a better grind and polish – 60% of its weight is on the head!
• LED Light to illuminate front of machine on the cutting path
• Carrying Poles for two-three person lifting
• 10-gallon (37 liters) water tank
• On-board USB Charger & Phone Carrier
• 2 – 44lb attached weights

⚙️ Electric Concrete Floor Grinder Specifications

• Working Width: 27 inches (68 cm)
• Engine: WEG 20 HP (14 kW) 1 or 3 phase
• Voltage: 230V available
• Weight: Approx. 923 lbs (420 kg)
• Dimensions: 46″ L x 27″ W x 46″ H
• Tool Plates: 4
• Total Tooling: 12 tools
• Recommended Project Size: Up to 5,000 sq ft

🏗️ Applications for Concrete Floor Grinding & Polishing

Best Uses for an Electric Concrete Floor Grinder in Commercial Projects

The PM Sr is engineered for a wide range of surface prep and polishing applications:

• Concrete grinding and polishing
• Epoxy and coating removal
• Terrazzo surface finishing
• Warehouse and commercial floor prep
• Adhesive and mastic removal
• Stone and marble polishing

This electric concrete floor grinder is ideal for commercial and industrial concrete flooring applications.

🔥 Why Choose an Electric Floor Grinder?

This floor grinder offers key advantages:

• Consistent power output
• Lower emissions (ideal for indoor use)
• Reduced fuel handling vs propane
• Reliable performance for controlled environments

The Prep/Master PM Jr is ideal when power access is available and indoor air quality matters.

🧠 Why Choose the Prep/Master PM Sr?

• Designed for residential commercial projects
• Combines power of large machines with compact design
• Easy to transport and maneuver on job sites
• Compatible with STI tooling systems
• This concrete floor grinder is a reliable solution for contractors focused on productivity and finishing quality.

Whether you’re polishing concrete floors or removing coatings, this machine delivers reliable performance across multiple surfaces.

Item #
718000220

❓ Frequently Asked Questions

What size jobs is the PM Sr best for?

It is recommended for projects up to 5,000 square feet, making it ideal for mid-size flooring jobs.

Can this concrete floor grinder polish concrete?

Yes. With proper tooling, it can be used for both grinding and polishing applications.

What power does it require?

This machine is available in 230V only

What surfaces can it handle?

Concrete, terrazzo, marble, and stone surfaces.

How many tools does it use?

It runs 12 tools across 4 tool plates for even grinding coverage. Click HERE to see our selection of tooling!

🔗 Related Resources

• Prep/Master 3003AR dust collector for use with electric concrete floor grinders
• OSHA silica dust safety guidelines for concrete grinding

Compact design and foldable
frame, that can be also separated
in two pieces for easy
transportation and storage

Uses 12 Tools and EG Quick Change Tool Plates!