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STI 4430 Prep/Master Grinder

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  • STI 4430 Prep/Master Grinder
  • STI 4430 Prep/Master Grinder

 Product Description

Ideal for Polishing Projects up to 20,000 SF (2,000 M2)

The Prep/Master STI-4430 floor grinding machine is an ideal choice for project sizes up to 20,000 SF (2,000m2). Quite unexpectedly for its weight and size, this grinder is extremely easy to operate due to the smooth operation of the STI rotary gear system. Its 30HP motor is built to last and its variable speed drive easily adapts to different grinding or polishing conditions for concrete, terrazzo, marble, and stone applications.

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. The 4430 is available in 220V and 480V, as well as with a 25HP motor. Uses eight tool plates (included) and twenty-four tools.

Working width: 44 in. (112 cm)
30 HP (22kW)
1 or 3 phase
Available in 230V or 480V
8 tool plates (included)
Uses 24 tools


  • Coverage: 20,000 SF (2,000 m2)
  • Power Source: 220/230 VAC 1 or 3 Phase, 60Hz or 380/480 VAC 3 Phase, 50-60Hz
  • Motor: 30 HP - 3 phase (22kW)
  • Power Cord: 30 ft. (9m) | 6-4
  • Dimensions: 80L x 44W x 52H in. (203 x 112 x 132cm)
  • Working Width: 44 in. (112 cm)
  • Weight: 1,460 lbs (662 kg)
  • Tools RPM: 250-750 RPM variable
  • Tools Needed: 24
  • Tools Attachment Style: EG Attachment System
  • Vacuum Hose Connection: 3 in. (76 mm) (sold separately)
  • Recommended Vacuum: PM3003GP

Production Rates:

  • Mastic Removal: 725 SF (67 m2) per hr
  • Thin Set Removal: 725 SF (67 m2) per hr
  • Mil Coatings Removal: 575 SF (53 m2) per hr
  • Concrete Polishing: 5,025 SF (467 m2) per hr


 Warranty Information

Prep/Master® Warranty

Substrate Technology guarantees that its machines and products are without manufacturing defects. The warranty period on machines is one (1) year from the date of sale and the variable speed drive carries a two (2) year warranty from the date of sale. Substrate Technology will replace any part that is defective at its own cost within the warranty period. This warranty does not cover wear items or instances of abuse or neglect.

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