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What Is Grit?

Grit refers to the particle size of the diamond abrasive used in concrete grinding and polishing tools. The grit number determines how aggressively the tool removes material from the concrete surface and the quality of the finish it produces.

In general, lower grit numbers are more aggressive, removing more material and leaving a rougher surface. Higher grit numbers create a smoother finish and are used during the final grinding and polishing stages.

How Do Grit Sizes Work?

Low Grit (16–50)

Low-grit diamond tools are designed for heavy material removal and surface preparation.

Common applications include:

  • Removing old coatings
  • Epoxy removal
  • Leveling uneven concrete
  • Initial grinding of hard concrete
  • Surface preparation before polishing

Medium Grit (60–120)

Medium-grit tools refine the surface after coarse grinding and reduce scratches.

Typical applications include:

  • Smoothing the concrete surface
  • Removing coarse grinding marks
  • Preparing the floor for finer grinding stages

High Grit (200–400)

At this stage, the concrete surface becomes significantly smoother and begins to develop a soft sheen.

Typical applications include:

  • Fine grinding
  • Surface refinement
  • Preparing the floor for polishing

Ultra-High Grit (800–3000)

Ultra-high grit diamond tools are used during the final polishing stages to achieve maximum gloss and clarity.

Typical applications include:

  • High-gloss concrete polishing
  • Mirror-like finishes
  • Decorative concrete floors
  • Commercial buildings and showrooms

Common Grit Sequence

A standard grinding and polishing process often follows this grit progression:

30 → 50 → 100 → 200 → 400 → 800 → 1500 → 3000

However, the exact sequence may vary depending on the concrete hardness, floor condition, and desired finish.

How to Choose the Right Grit

Selecting the correct grit depends on several factors, including:

  • Concrete hardness
  • Age and condition of the concrete
  • Type of concrete grinding machine
  • Diamond tool bond and segment type
  • Required surface finish
  • Desired gloss level

Using the correct grit sequence improves grinding efficiency, extends tool life, and produces a higher-quality finish.

Expert Advice for Choosing Diamond Tools

Every concrete floor is different, making proper grit selection essential for achieving the best results. Choosing the right diamond tools can reduce project time, improve productivity, and lower operating costs.

Our experienced team provides professional guidance to help you select the most suitable concrete grinding machines, diamond tools, polishing pads, and concrete chemicals for your application. Whether you are preparing a surface or creating a high-gloss polished floor, we are here to help you find the right solution.