• 3 inch grinding disc for STI PrepMaster with round and square pin options
  • 3 inch grinding disc for STI PrepMaster with round and square pin options
  • 3 inch grinding disc for STI PrepMaster with round and square pin options
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3 Inch Grinding Disc for STI PrepMaster Grinders

3 Inch Grinding Disc for STI PrepMaster Grinders

M90006ACE

$21.56
$21.56
Shipping calculated at checkout.

3 Inch Grinding Disc for STI PrepMaster Grinders

The 3 Inch Grinding Disc for STI PrepMaster grinders is designed for professional concrete and terrazzo floor grinding applications. Built for durability and consistent performance, each disc features three 8mm-tall diamond segments for efficient material removal and smooth grinding results.

Two Pin Options

Two pin configurations are available: two round pins and two square pins. Please check the tool plate on your STI PrepMaster grinder and select the matching pin configuration before ordering.

Round Pins – Two round locating pins
Square Pins – Two square locating pins

Key Features

  • Compatible with STI PrepMaster grinders
  • 3-inch grinding disc
  • Three diamond segments
  • 8mm segment height
  • Round pin and square pin options available
  • Designed for concrete and terrazzo floors
  • Durable construction for professional floor preparation
Grit Options

All of our grinding tooling comes with a comprehensive range of grit sizes to cover every stage of surface preparation and polishing. Available grit options include 6#, 16/20#, 16#, 20#, 30#, 30/40#, 50#, 60/80#, 60#, 70#, 80/100#, 80#, 100#, 100/120#, 120#, 150#, and 200#. 

Each grit size is designed to optimize results at different steps of the concrete polishing process. This variety makes the 3inch Grinding Disc Compatible with STI PrepMaster a flexible choice for all project types.

Bond Options Based on Surface Hardness

Choosing the right bond is critical for optimizing your grinding outcomes. It also helps extend the lifespan of your concrete floor grinding tool. This item offers various bond options tailored to different surface hardness levels.

Packaging

All tooling comes in a reliable packaging that ensures product safety during transit. Each set is securely packed in a sturdy brown box. The box comes with a clear specification label showing product details.

Field-Tested and Approved Quality

Our tooling undergoes daily testing by our sister company, Custom Concrete Prep & Polish. With over a decade of expert experience in professional concrete grinding, they ensure the tooling meets industry standards for quality and performance.

Explore More

Explore the full Tooling Collection Compatible with STI Prep/Master Machines to find other complementary products. You can also learn more about our company and values on our about page.

Note:

ACE Diamond Tooling is an independent manufacturer.  STI Prep/Master Machines are trademarks of their respective owners. ACE products are not manufactured by or affiliated withSTI Prep/Master Machines.

Shipping

Orders are typically delivered within 10–15 days because all products are shipped directly from our factory. This includes approximately one week for custom tool production and one week for express shipping, ensuring high product quality while keeping prices competitive.

We generally ship via FedEx, UPS, or DHL. If you prefer a specific shipping carrier, please leave a note at checkout or email us at info@acediamondtooling.com.

Once your order has been shipped, we will notify you by email and provide the tracking number as soon as it becomes available. You can also check your order status anytime in your account on our website. We will monitor the shipment and ensure your package is delivered safely.

Return & Refund

Our tools are tested daily to ensure stable quality and high performance. In the rare event of a quality issue, we guarantee a 100% return, replacement, or refund for the affected items.

If you need to report a quality concern, you may contact us via:

We are committed to resolving any issues promptly and ensuring your satisfaction.

FAQs

  1. Do you have expedited shipping?
    We are already using the fastest shipping solution available. Our company and customer service team are based in the United States, but to ensure high quality, competitive pricing, and a wide range of options for customers, our products are made-to-order and shipped directly from the factory.
  2. Do I need to pay import duties?
    For customers in the United States (except for U.S. island territories), the current price already includes all applicable taxes. For customers in other countries, import duties may apply. If duties are required, the courier company will contact you directly and assist with the payment and processing.
  3. How to measure concrete floor hardness?
    Rebound test for PSI hardnessA rebound test (Schmidt Hammer test) is a quick, non-destructive method to estimate the compressive strength (PSI) and surface hardness of a concrete floor.
    Scratch test for Mohs scaleThe Mohs hardness test measures how resistant concrete is to scratching by using tools with known hardness levels. A test pick is dragged across the concrete surface, and the scratch is inspected. The highest-numbered pick that can scratch the surface represents the concrete’s surface hardness. Mohs scale ranges from 1 (soft) to 10 (hard).
3 inch grinding disc for STI PrepMaster with round and square pin options

3 Inch Grinding Disc for STI PrepMaster Grinders

$21.56
$21.56