GRIT CONVERSION

Product Reference

Abrasive Grit Standards

Grit Conversion Chart

Abrasive grit size is labeled differently depending on the standard used. Use this chart to convert a grit size between FEPA, U.S. Mesh, and DIN.

  • FEPA — ISO 6106-2005 standard, issued according to FEPA (Federation of European Producers of Abrasives) recommendations.
  • MESH — ANSI B74.16-2002 American standard.
  • DIN — DIN 848-65 German standard.
  • Grit Size Class — an indicative description that refers to precision grinding.

Quick Convert

Choose a standard, enter a grit value, and see the equivalents in the other standards.

FEPA—
U.S. Mesh—
DIN—

Enter a value above to see its equivalents.

Full Conversion Table

Complete FEPA / U.S. / MESH / DIN / Grit Size Class chart, as published by FM Carbide.

FEPA U.S. MESH DIN Grit Size Class
7 2500 - 7 Micron
10 2000 - - Micron
12 1500 - - Micron
15 1200 - 15 Micron
20 1000 - 15 Micron
25 800 - 15 Micron
30 600 500/600 30 Very Fine
35 500 400/600 - Very Fine
46 400 325/400 35 Very Fine
54 325 270/325 45 / 50 Fine
64 280 230/270 55 / 60 / 70 Fine
76 220 200/230 85 Fine
91 180 170/200 - Fine
107 150 140/170 90 / 100 / 140 Medium
126 120 120/140 - Medium
151 100 100/120 120 / 150 Large
181 80 80/100 180 Large
252 60 60/80 200/250 / 280 Very Large
301 50 50/60 - Very Large
427 40 40/50 300 Special Use
602 30 30/40 - Special Use
852 20 20/30 - Special Use
1182 16 16/20 - Special Use

Grain-Roughness Ratio

Grinding grit sizes conversion diagram

Just as an indication, here is a table of the various types of roughness that can be reached on carbide surface grinding (cutting speed approx. 24 m/sec — table speed 15 m/min), coolant: water-based emulsion.

Grit 7 15 54 76 107 181 602
FEPA 7 15 54 76 107 181 602
US 2500 1200 325 220 150 80 30
Ra (μ) 0.05 0.10 0.20 0.40 0.80 1.60 3.20
CLA (μ) 2 4 8 16 32 64 125
Swiss N2 N3 N4 N5 N6 N7 N8

Abrasives Concentration

The abrasive concentration is expressed in carats/cc. It stands for the ratio between its weight and the volume of the abrasive conglomerate; the weight of the grit cladding, if present, is not taken into account.

Concentration 35 45 50 68 75 90 100 125 150
Ct/cm³ 1.5 2 2.2 3 3.3 4 4.4 5.6 6.6

Need help matching a grit spec? Send us your application details or the marking on your current wheel and we'll confirm stock or quote a custom-made wheel.

Contact Us
References: FEPA / ISO 6106-2005; ANSI B74.16-2002; DIN 848-65. Dashes indicate no directly documented equivalent in this chart.