If you work with tungsten carbide—whether you are sharpening end mills, finishing brazed tips, or reconditioning drill bits—you know that grinding this super-hard material requires specialized abrasives. Using the wrong wheel leads to heat checking, glazing, and poor surface finish.
Enter the 20mm outer diameter x 6mm inner bore resin-bonded diamond end face grinding wheel. It may look small, but this little tool is a powerhouse for precision carbide work.
In this post, we’ll break down why this specific size and bond type is perfect for dry grinding tungsten carbide tools.
Why Tungsten Carbide Needs Diamond
Tungsten carbide (WC) ranks between 8.5 and 9 on the Mohs hardness scale—almost as hard as diamond itself. Standard aluminum oxide or silicon carbide wheels simply can’t cut it; they wear out fast and generate excessive heat.
Diamond is the only abrasive hard enough to effectively grind carbide. But within diamond wheels, the bond type makes all the difference.
Resin Bond vs. Metal Bond: Why Resin Wins for Small Tools
Our featured wheel uses a resin bond. Here is why that matters for 20mm end-face applications:
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Cooler Cutting: Resin bonds break down more easily than metal bonds, exposing fresh diamonds and reducing friction. This keeps the workpiece temperature down—critical for preventing micro-cracks in carbide.
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Self-Sharpening: As the resin wears, new sharp diamond particles emerge. This maintains a consistent cut without manual dressing.
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Smoother Finish: Resin wheels produce a finer surface finish on carbide, often reducing or eliminating secondary lapping steps.
Why 20mm OD x 6mm Bore?
This is not a random size. The 20mm diameter is large enough to cover the cutting edges of most small carbide tools (end mills, reamers, boring bars) but small enough to fit into confined spaces or precision tool grinders.
The 6mm bore is a common spindle size for small die grinders, universal tool grinders, and CNC tool reconditioning machines. It offers a stable fit with minimal run-out—essential for end-face grinding where flatness matters.
End Face Design: The Best Choice for Tool Tips
Why an end face (frontal) wheel instead of a cylindrical one?
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Flush grinding: You can bring the entire flat surface of the wheel against the tool tip or relief face.
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Precise geometry: Perfect for grinding primary and secondary clearances on carbide inserts and end mills.
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Stability: The short overhang possible with a small end face wheel reduces vibration and chatter.
Dry Grinding: Practical and Efficient
This wheel is designed for dry operation. That means:
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No coolant mess or disposal costs
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Ideal for benchtop grinders and field reconditioning
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Still safe for carbide because the resin bond controls heat
Pro tip: Even though it’s dry-rated, use light pressure and multiple passes. Let the diamond do the work.
Typical Applications
| Tool Type | What to Grind | Why This Wheel Works |
|---|---|---|
| Carbide end mills | End gash, center cutting edge | Small OD fits between flutes |
| Brazed carbide tips | Tip top surface and side relief | End face grinds flush to steel shank |
| Solid carbide drills | Chisel edge thinning, point angle | Precise control over small geometry |
| Carbide burrs | Flute tops and radius corners | Resin bond prevents loading |
How to Use the 20x6mm End Face Wheel Safely
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Check speed rating: Ensure your grinder’s RPM matches the wheel’s max speed (typically 8,000–15,000 RPM for this size).
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Mount carefully: Use clean, precise flanges. Even 0.01mm run-out affects carbide finish.
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Light passes: Take 0.01–0.03mm depth cuts. Heavy pressure causes glazing.
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Dress when needed: If the wheel loads with carbide dust, use a soft dressing stick (not a diamond dresser).
Conclusion: Small Size, Big Performance
Don’t underestimate the 20mm OD x 6mm bore resin diamond end face wheel. For anyone serious about tungsten carbide tool maintenance—whether in a small workshop or a large manufacturing facility—this wheel delivers precision, longevity, and excellent surface quality.
Ready to upgrade your carbide grinding?
? Shop our 20x6mm resin diamond end face wheels today – designed specifically for tungsten carbide tools.
