Grinding concrete floors requires the right tools for the best finish, productivity, and tool life. One of the most critical tools in this process is the diamond cup wheel. Whether you’re removing coatings, leveling uneven surfaces, or preparing concrete for polishing, using the correct type of diamond cup wheel can make all the difference.
In this guide, we’ll break down how to choose the right diamond cup wheel for your concrete grinding job.
What Is a Diamond Cup Wheel?
A diamond cup wheel is a metal-bonded abrasive tool used with angle grinders or floor grinding machines. It features industrial-grade diamonds embedded in the segments to grind hard surfaces like:
Concrete
Terrazzo
Granite
Epoxy coatings
Stone surfaces
1. Concrete Hardness
The hardness of your concrete surface is one of the most important factors when selecting a diamond cup wheel.
Soft Concrete: Use a hard-bond cup wheel. It wears slower and exposes diamonds at the right rate.
Hard Concrete: Use a soft-bond cup wheel, which allows diamonds to be released more easily for aggressive grinding.
Tip from SANG Experts: A mismatch between bond type and concrete hardness can lead to glazing or premature wear.
2. Cup Wheel Grit Size
Grit size impacts the finish and material removal rate:
Coarse Grit (6–30): Fast material removal, ideal for coating removal and aggressive grinding.
Medium Grit (40–80): Balanced for light grinding and surface preparation.
Fine Grit (100–200): For smooth finishing or polishing stages.
3. Segment Shape and Configuration
Different segment shapes affect grinding speed, cooling, and surface finish.
Segment Shape
Best For
Arrow Segments
Aggressive removal of epoxy, glue, paints
Turbo Segments
Fast, smooth grinding on concrete
Double Row
General-purpose grinding, long life
Single Row
Light grinding, lower cost
PCD Segments
Thick coating and adhesive removal
S-Shape Segments
Balanced grinding and debris removal, less vibration
Eye Drop Segments
Smooth finish, ideal for fine grinding and polishing
Ensure the cup wheel matches your grinder:
Arbor Size: Common arbor sizes include 5/8"-11 and M14.
RPM Rating: Check that the wheel can handle the RPM of your grinder.
At SANG Diamond Tools, we offer customized arbor sizes and segment configurations for compatibility with most global grinder brands.
5. Wet vs Dry Grinding
Dry Grinding: More convenient; ideal for job sites without water access. Choose cup wheels with ventilation holes for cooling.
Wet Grinding: Reduces dust and improves lifespan. Ensure your wheel is compatible with wet applications.
Common Applications and Recommended Cup Wheels
Application
Recommended Cup Wheel Type
Heavy epoxy or coating removal
PCD segments or arrow-shaped segments
Surface leveling (medium grind)
Double row or turbo segments
Polishing preparation
Fine-grit Eye Drop or S-shape segments
Fine finish grinding
S-shape or Eye Drop segments
Rough surface grind/removal
Arrow, turbo, or S-shape segments
Light epoxy or adhesive removal
Arrow or S-shape segments
Why Choose SANG Diamond Tools?
At SANG Diamond Tools, we engineer diamond cup wheels that match or exceed the performance of industry leaders, while offering better value and customization options.
Our advantages:
Over 30 years of diamond tool manufacturing experience
Tailored bond formulas for different concrete types
Fast delivery and global shipping
OEM & ODM services available
Whether you are a contractor, distributor, or rental company, we provide professional-grade diamond cup wheels designed for performance, durability, and safety.
1. Can I use the same cup wheel for different concrete floors?
Only if the hardness and application are similar. Otherwise, switching to the right bond type is recommended.
2. How do I know when to replace the cup wheel?
When segments wear down to the base or performance significantly drops, it’s time to replace.
3. Are SANG cup wheels compatible with Hilti or Husqvarna grinders?
Yes! We manufacture wheels compatible with most major brands. Contact us for custom arbor sizes.
Choosing the right diamond cup wheel for concrete grinding can save you time, money, and effort. By understanding your concrete type, application, and machine compatibility, you can ensure optimal performance and longer tool life.
Need help selecting the right product?
Contact SANG Diamond Tools today — our experts are ready to assist you with customized solutions for any concrete grinding challenge.