The Ultimate Grit Guide: How to Choose the Right Nail File for Acrylics, Gels, & Natural Nails
Walking into a nail supply store or browsing online, you’ll find nail files with numbers printed on them: 80/80, 100/180, 180/240. But what do these numbers actually mean, and how do you know which one to use for each step of your service?
Using the wrong grit on the wrong surface can lead to nail damage, slow service times, or ragged edges that snag on clothes.
In this comprehensive guide, Henry Pro Nail breaks down everything you need to know about nail file grits so you can select the perfect tool for every client.
What Does "Grit" Mean in Nail Files?
The grit number refers to the number of abrasive particles per square inch on the file's surface.
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Lower numbers (e.g., 80, 100): Coarser grit with larger particles. Best for rapid material removal on hard enhancements.
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Higher numbers (e.g., 180, 240+): Finer grit with smaller particles. Best for smooth finishing, natural nails, and delicate buffing.
Pro Tip: When a file is labeled 80/80, both sides have an extra-coarse 80-grit rating. If labeled 100/180, one side is coarse (100) and the other is medium-fine (180).
1. Extra Coarse Grit (80 / 80 Grit) – The Heavy Duty Lifesaver
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Best For: Heavy acrylic debulking, length reduction, and tough product removal.
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When to Use: When you need to quickly cut down long acrylic extensions, debulk thick polygel, or re-shape hard gel sets.
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Caution: NEVER use an 80-grit file on natural nails! It is extremely coarse and strictly meant for hard enhancement materials.
2. Coarse Grit (100 Grit) – Fast Shaping for Extensions
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Best For: Shaping and debulking acrylics, hard gels, and dip powder.
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When to Use: Great for taking down the surface bulk of acrylic sets before soaking off, or for carving crisp sidewalls on new extensions.
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Caution: Keep away from the natural nail plate and cuticle area to avoid friction burning or thinning the natural nail.
3. Medium-Fine Grit (180 Grit) – The All-Around Workhorse
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Best For: Contouring enhancement surfaces, smoothing gel polish bases, and preparing strong natural nails.
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When to Use: Perfect for refining the shape of gel extensions, smoothing out bumpiness on acrylics before top coating, or shortening strong toenails/fingernails.
4. Fine Grit (240 Grit & Above) – Natural Nail & Finishing Care
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Best For: Natural nail prep, smoothing fine scratches, and delicate edge shaping.
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When to Use: Ideal for shaping natural nails without causing micro-shatters or peeling edges. Use this to lightly remove shine from the natural nail plate before applying gel polish or builder gel.
Why Quality Matters: Coated Grit vs. Cheap Abrasives
Not all grit ratings are created equal. Cheap nail files shed their abrasive particles after just a few strokes, leaving uneven patches that scratch rather than file smoothly.
Professional files from Henry Pro Nail are designed with:
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High-Density Japanese/European Abrasives: Longer-lasting sharpness with minimal shedding.
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Rigid Inner Core: Keeps the file completely straight under pressure for razor-sharp filing lines.
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Washable & Sanitizable Design: Built to withstand professional salon disinfection standards.