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Substrate Technology, Inc. Prep/Master Jr. Floor Grinding Machine Our customers' favorite little grinder! Heavy head pressure for a better grind and polish — 60%.. Product #: 823752201 based on 0 reviews

Prep/Master Jr. Floor Grinding Machine

Brand: Substrate Technology, Inc.
Weight: 455.00lb
Dimensions: 50.00in x 23.00in x 48.00in

Prep/Master® Jr. Floor Grinding Machine (Electric)

Ideal for Polishing Projects up to 1,000 SF (100 M2)

Our customers' favorite little grinder! The Prep/Master® Jr. floor grinding machine by STI works extremely well in small, hard-to-reach areas that requires a more compact design — perfect for residential garage floors and basements.

This grinder is very aggressive, yet extremely easy to operate due to the smooth operation of the STI rotary gear system. In addition, the low price of the Prep/Master Jr. is very affordable and fits any project budget.

  • Working width: 23 in. (58cm)
  • 7.5 HP (5.6kW)
  • 220-240V Single Phase, 40A
  • 450 lbs. (204 kg) including pocket weights
  • 2 tool plates (included)
  • Uses 6 tools

Special Features

  • Heavy head pressure for a better grind and polish — 60% of its weight is on the head!
  • Magnetic LED Light to illuminate front of machine or behind machine on the cutting path
  • Easy 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 two-three person lifting
  • 8-gallon (30 liters) water tank
  • On-board USB Charger & Phone Carrier

Main Features of the Prep/Master Jr. Floor Grinding Machine


How to Assemble and Disassemble the Prep/Master Jr. for Easier Transportation


Head Pressure Matters! Why the Junior is superior to other smaller floor grinders.

Item Numbers
Item # 823752201
Machine Specs - Electric
Coverage Up to 1,000 SF (100 m2)
Power Source 220-240V Single Phase, 40A
Motor 7.5 HP, Variable Speed Drive (5.6kW)
Dimensions 50 L x 23 W x 48 H in. (127 x 58 x 122 cm)
Working Width 23 in. (58cm)
Weight 450 lbs. (204 kg) including pocket weights
Tools RPM 250-500 RPM Variable
Tools Attachment Style EG Proprietary Attachment System
Vacuum Hose Connection 2 in. (50 mm) sold separately
Recommended Vacuum PM3003AR
Production Rates
Mastic Removal 200 SF (20 m2) per hour
Thin Set Removal 200 SF (20 m2) per hour
+/-25 Mil Coatings 200 SF (20 m2) per hour
Concrete Polishing 300 SF (30 m2) per hour
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