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Surface Roughness vs. Abrasive Grain Size

U.S. mesh size vs. surface roughness.

Abrasive grain size and workpiece surface roughness:

Abrasive Grain Size vs. Surface Roughness
Surface Roughness R_a (μm)	Abrasive Grain Size (U.S. mesh size)
0.7 - 1.1	46
0.35 - 0.7	60
0.2 - 0.4	80
0.17 - 0.25	100
0.14 - 0.2	120
0.12 - 0.17	150
0.1 - 0.14	180
0.08 - 0.12	220

Typical tolerances for floors, walls, columns and more.

Comparing sandpaper grit size and surface roughness.

Machine processing and tolerance grades.

Manning's roughness coefficients for some common materials.

US commercial sieve sizes vs. mesh designations.

Mechanical production methods and their surface roughness.