Nail-file grit: what the number actually describes
Grit describes an abrasive’s particle-size grade. Within the same grading system, a higher number generally indicates a finer abrasive. The number is one part of a file’s specification; it is not a universal measure of pressure, material removal or suitability for every nail surface. [1][2]
KEY TAKEAWAYS
P and F are different grading systems
FEPA uses P-grades for coated abrasives, where grains are carried on a backing, and F-grades for bonded abrasives. A grade describes a particle-size distribution, not one identical diameter for every grain. Keep the prefix when reading a specification: P220 and F220 are not interchangeable labels merely because their numbers match. [1]
Real designation examples
FEPA’s public catalogue lists P12–P220 and P240–P5000 for coated abrasives, and F4–F220 and F230–F2000 for bonded abrasives. P220 and P240 thus name real grades within the P series; the higher P number indicates a finer grade. A bare “220” on a nail file does not establish which series its supplier uses. These examples decode grade names; they do not select a file for a nail surface. [2][3]
Compare the complete specification
Norton Abrasives’ supplier guide describes grain type and backing as well as grit number. It concerns general abrasives, including sandpaper for wood, rather than a nail-filing protocol. Our reading: use it to understand the specification fields, without treating it as a test of a particular nail file. [2]
Article Sources
- FEPA — Abrasive grains and grit sizes
Primary source
Passages on F-grit for bonded abrasives and P-grit for coated abrasives: separate grading systems and particle-size distributions/ranges.
- Norton Abrasives — Choosing the Right Sandpaper
Manufacturer material
Passages on grade, abrasive grain and backing. Used for general abrasive terminology; woodworking procedures are not transferred to nails.
Article date:
- FEPA — Grains: F and P abrasive standards
Primary source
Standards catalogue entries name F4–F220 and F230–F2000 for bonded abrasives, and P12–P220 and P240–P5000 for coated abrasives. The public list supplies real designations; paid standards and numerical particle-size tables were not examined.
Written and reviewed with AI assistance using the linked sources. No hands-on product testing or independent specialist review was performed.
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