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Surface

Surface Texture Equivalents








ANSI B46.1 is used in USA (measurement units minch(micro.inch) )

ISO 1302:1992 which uses N numbers..These are not included in EN ISO 1302:2002

The table below provide equivalent values for the Average Roughness R a , the USA R a Values, the approximate R t values, the N numbers, the obsolete triangular representations, and some manufacturing finishes. There is no mathematical relationship between R a and R t The R t values shown in the table below are very approximate and should only be used for guidance. For notes describing the meanings of R a, R t etc. reference links below and surface finish.

Notes:
μm = 10 -6 metre
μinch = 10 -6 inch

R a-μm - 0.025 0.05 0.1 0.2 0.4 0.8 1.6 3.2 6.3 12.5 25 50
R a- μinch 1 2 4 8 16 32 63 125 250 500 1000 2000
R t (R y ) -μm   0,25 0,5 1 2 4 8 16 32      
N-Grade N1 N2 N3 N4 N5 N6 N7 N8 N9 N10 N11 N12
Triangular
Indication
Triangular Indication Triangular Indication Triangular Indication Triangular Indication
Finish   Lapping/Superfinishing Ground Finishes Smooth Turned Medium Turned Rough Machined

Rules of Thumb for surface finish equivalent of N grade and Ra values

  • Rough turned with visible toolmarks....N10 = 12.5mm (micro.m)

  • Smooth machined surface....N8 = 3.2mm (micro.m)

  • Static mating surfaces (or datums).... N7 = 1.6mm(micro.m)

  • Bearing Surfaces.... N6 = 0.8mm (micro.m)

  • Fine lapped surfaces.... N1 = 0.025mm (micro.m)



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EN 10305-1 E215 E235 E355 Seamless Precision Steel Tube Tubing Tubes
DIN 2393 St28 St34.2 St37.2 St44.2 St52.3 Welded Precision Steel Tubes
EN 10305-2 E195 E235 E355 Welded Cold Drawn Precision Steel Tube