Straight from the Source

Prep/Master Jr. Electric Floor Grinding Machine


  • Our customers’ favorite little grinder!
  • Heavy head pressure for a better grind and polish — 60% of its weight is on the head!
  • Ideal for residential, garage, and basement projects up to 1,000 SF (100 m2)
  • Electric motor: 7.5 HP (5.6kW)
  • Easy disassembly of machine into two sections for easy transportation into hard to reach locations
  • Call (815) 472-9744 to speak to an expert.

**Ready for immediate delivery**

12 months with 0% interest for qualified customers on equipment purchases of $10,000 or more.


Prep/Master Jr. Electric Floor Grinding Machine

Engineered and crafted for Polishing Projects up to 1,000 SF (100 m2)

If you’re in need of a compact yet powerful and efficient floor grinding machine, the Prep/Master Jr. Electric Floor Grinding Machine is for you! Designed and crafted for small, medium, and large-sized surface preparation projects up to 1,000SF (100 2). Say goodbye to the dreaded days of limited accessibility and say hello to working with a more compact design that grants surface preparation professionals the ability to reach tight and hard-to-reach surfaces.

Due to the state-of-the-art STI rotary gear system, this grinder operates extremely smoothly yet aggressively. Along with that, this floor grinding machine is priced very cost-effectively when compared to other similarly capable machines.

Please note, it is recommended that any individual operating the Prep/Master Jr. Electric Floor Grinding Machine follows it’s safety manual as closely as possible in order to avoid safety hazards or risks as well as project downtime and other project-related setbacks.

Prep/Master Jr. Electric Floor Grinding Machine Technical Specifications

  • A working width of 23 inches (58 centimeters)
  • A reliable and powerful 7.5 HP (5.6kW) motor
  • 220-240V Single Phase, 40A
  • 50 ft. cord & plug (not included, but can be purchased in an upgrade package)
  • 2 tool plates (included)
  • Uses 6 tools
  • An overall weight of 450 lbs. (204 kg) including pocket weights

Prep/Master Jr. Electric Floor Grinding Machine Unique Features

  • Heavy head pressure resulting in better grinding and polishing, as 60% of its weight is on the machine’s head!
  • Magnetic LED Light to light up the front of the machine or behind the machine on the cutting path
  • Painless disassembly of machine into two sections for easier transportation (Grinding head = 260 lbs. // Handle = 130 lbs. // Two Pocket Weights = 30 lbs. each)
  • Screw-in Carrying Poles for 2 or 3 person lifting
  • 8-gallon (30 liters) water tank
  • An on-board USB Charger and Phone Carrier

Be sure to check out our grinders and polisher parts and accessories to learn more about our adapter plates, velcro attachments, resin inserts, light kit upgrades, maintenance kits, Morflex couplers, STI cord charts, STI edge plates, as they may be of help to you and your surface preparation team.

More Information on the Prep/Master Jr. Electric Floor Grinding Machine

When it comes to floor grinding, we talk a lot about the large floor grinders, able to tackle thousands of square feet with ease. However, you know that smaller projects, like garages and basements are just as important as the big ones. That’s why the Prep/Master Jr. Electric Floor Grinder is a customer favorite and a consistently good seller!

Check out the durability of the Prep/Master Jr. in the video below!

Why You Need a Prep/Master Jr. Electric Floor Grinder

Having a more powerful, larger floor grinder is ideal for large spaces, like warehouses and commercial garages. However, trying to maneuver large equipment in a small space that’s only a few hundred square feet, like a garage or a basement is challenging. Additionally, those large grinders can’t access hard to reach areas, like behind stairs, around columns or support poles, or on stairs or steps.

The Prep/Master Jr. is designed for spaces up to 1,000 square feet, and can tackle those tasks with ease. With a working width of 23 inches, you can cover spaces quickly, but more importantly, it’s powerful motor and heavy head pressure results in outstanding grinding and polishing capability.

Additionally, the Prep/Master Jr. electric floor grinder is easy to take apart into two sections so you can transport it and move it around without difficulty. It even has an on-board USB charger and phone carrier for added convenience!

The Prep/Master Jr. Floor Grinder Holds Up

As you can see in the video above, the Prep/Master Jr. has built-in failsafes to ensure its durability. While you probably won’t be using a compact grinder to flatten a half-inch lip (we’d recommend a scarifier), there are times when hitting these things are unavoidable, especially if there is a thick floor coating hiding these kinds of issues.

If the grinder hits overly rough areas, beyond what can feasibly be handled by a grinder, it will bounce a bit to let you know to turn it off. However, like you saw in the video above, if you hit a sharp lip or “speed bump” or something like that, it will shut down, rather than get damaged. This allows you to make the right adjustments to your surface preparation plan without having to worry about your equipment breaking down!

Contact Us to for a Free Quote on the Prep/Master Jr. Floor Grinder

If you’d like to add the Prep/Master Jr. electric floor grinder to your equipment inventory, reach out to the product experts at Buy Manufacturers Direct today! We can not only offer you a competitive quote, but we can also connect you with the right kinds of grinder accessories that will help you to get the most from your equipment. Reach out to us today at (815) 472-9749 or by filling out our contact form.

PrepMaster Jr. Electric Floor Grinding Machine For Sale Buy Manufacturers Direct sells surface preparation equipment such as floor scrapers, burnishers and floor machines (such as the Prep/Master Jr. Electric  Floor Grinding Machineshot blasters, diamond grinders, scarifiers, profilers, and dust collectors. Along with the machines, BMD only sells OEM consumable parts so that the machines are as effective as they are designed to be. Buying from BMD you are buying through a channel that is endorsed and supported by its vendor partners. This means you have direct access to the people that make what you buy and know the product better than anyone.

Additional information

Weight 510 lbs
Dimensions 48 × 40 × 58 in

Complete, Without cord or plugs





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