Diamond Grit Size Guide: What It Means And Why It Matters
When choosing a diamond blade, most people focus on diameter, bond type, and blade application. But one often-overlooked feature that plays a critical role in performance is diamond grit size. Whether you're cutting concrete, tile, asphalt, or granite, selecting the right diamond grit size can dramatically impact cutting speed, finish quality, and blade lifespan.
In this guide, we'll explain what diamond grit size is, how it works, and how to choose the right grit for your specific job. Contact Blades Direct today for more information about our selection of diamond blades.
What Is Diamond Grit Size?
Diamond grit size refers to the size of the synthetic diamond particles embedded in the blade's cutting segments. Grit is measured using mesh numbers---the higher the number, the finer the grit. Lower numbers indicate larger, more aggressive particles.
Common Diamond Grit Ranges:
- Coarse (20--40 grit): Fast cutting but rough finish.
- Medium (50--80 grit): Good balance of speed and smoothness.
- Fine (100--200+ grit): Slower cutting but ultra-smooth finish.
Just like sandpaper or grinding wheels, grit size affects how quickly and cleanly the blade cuts through material.
How Diamond Grit Size Affects Blade Performance
Choosing the right grit size can be the difference between a clean, efficient cut and a frustrating, uneven job. Here's how grit size impacts performance:
1. Cutting Speed
- Coarse grit blades (20--40 grit) remove material quickly, making them ideal for demolition and rough cuts.
- Fine grit blades cut slower but produce cleaner edges---better for detailed work or finished surfaces.
2. Finish Quality
- Fine grit blades deliver smooth, chip-free finishes on tile, porcelain, and stone.
- Coarse grit blades may leave chatter marks or surface roughness, but that's acceptable for structural concrete cuts.
- Fine grit wears slower but builds up heat more quickly--wet cutting is essential.
- Coarse grit blades tend to wear faster on hard materials but stay sharper for aggressive cuts.
How To Choose The Right Diamond Grit Size
Your choice of grit should match the material being cut, the desired finish, and the cutting method (wet or dry). Here's a basic guide:
| Material | Recommended Grit Size | Why? |
|---|---|---|
| Concrete | 30--50 | Fast cuts with good control |
| Tile & Porcelain | 100+ | Smooth finish, prevents chipping |
| Granite & Marble | 50--100 | Clean finish on dense material |
| Asphalt | 30--40 | Fast removal, rougher finish OK |
| Glass & Ceramics | 120+ | Ultra-fine cuts, minimal damage |
Always consider whether you need a fast, rough cut or a precise, finished result. And don't forget---blade grit size should match your saw's RPM rating and intended application.
Using Diamond Grit Size To Your Advantage On The Jobsite
Understanding and applying the correct diamond grit size can:
✅ Improve overall jobsite productivity
✅ Minimize blade wear and tear
✅ Enhance cut quality
✅ Reduce rework or damaged materials
If you're working on a multi-phase project, you might even use multiple grit sizes---starting with coarse blades for speed and switching to fine blades for finishing cuts.
Frequently Asked Questions About Diamond Grit Size
Can One Blade Handle Multiple Grit Sizes?
Most blades use one consistent grit size, but multi-layered blades or specialized designs may feature varying grit zones for progressive cutting.
Does Diamond Grit Size Affect Heat Generation?
Yes. Finer grit generates more heat, which can lead to glazing or premature wear if not properly cooled. Use wet cutting with fine-grit blades to extend life.
How Can I Tell If I Chose The Wrong Grit?
If your blade is cutting too slowly, overheating, or producing chipped edges, you may need to adjust grit size or blade type.
Final Thoughts
The diamond grit size of your blade is a small detail that makes a big difference. Whether you're chasing speed, smoothness, or longevity, understanding grit size helps you choose the right blade for the job---and get better results every time.
For high-quality diamond blades tailored to your specific application, check out our full lineup at BladesDirect.net. From fine-grit tile blades to aggressive concrete cutters, we have the right blade for every job.