H O N E C T O
global standard of parameter specifications for surface roughness
Standard Code ISO468-82 ISO1302-78 FR standard NFE05-016-78 CN standard GB1031-68 CN standardGB1031-63 GB standard BS1134-72 US standard ANSIY14.36-78 JP standard JIS B0601-82 SU standard ГОСТ DE standard
DIN3141--78 DIN ISO1302--80
Common Ratio 1.25:2 2 1.25:2 2 2 1.25:2 2 1.25:2 Symbol common ratio(2);Ra(μm)
Parameter Ra Ra Ra grade grade detailed grading Ra Ra Ra grade Ra Ra Ra grade Ra serial position
Unit μm μin μm μm μm μin μm μm μm symbol μm 1 2 3 4
Surface Texture/ Roughness (grade and value) 0.008 1 0.025 N1 ▽14 ▽14c 0.0063 0.012 0.5 0.0125 0.012* 0.025 ▷
▷
▷
▷		 N1 0.008 without symbol Requirment for specific surface treatment
0.01 ▽14b 0.008
0.012* ▽14a 0.01 0.01
0.016 ▽13 ▽13c 0.0125 0.012* S rough surface, polishing when necessary
0.025* ▽13b 0.016 0.025 1 0.025 N1 0.025* 0.016
0.032 2 0.05 N2 ▽13a 0.02 0.02
0.04 ▽12 ▽12c 0.025 0.025*
0.05* ▽12b 0.032 0.05 2 0.05 N2 0.05* 0.05 N2 0.032 untreated surface, surface cutting and polishing allowed
0.063 4 0.1 N3 ▽12a 0.04 0.04
0.08 ▽11 ▽11c 0.05 0.05*
0.1* ▽11b 0.063 0.1 4 0.1 N3 0.075 0.1 N3 0.063
0.125 8 0.2 N4 ▽11a 0.08 0.075 0.08 Material-removing-treatment is not allowed, unless delivered state is kept
0.16 ▽10 ▽10c 0.1 0.1* 0.1*
0.2* ▽10b 0.125 0.2 8 0.2 N4 0.125 0.2 N4 0.125
0.25 16 0.4 N5 ▽10a 0.16 0.15 0.16
0.32 ▽9 ▽9c 0.2 0.2* 0.2* Product has semi-high level of clean but untreated surface
0.4* ▽9b 0.25 0.4 16 0.4 N5 0.25 0.4 ▷
▷
▷ 		N5 0.25
0.5 32 0.8 N6 ▽9a 0.32 0.32 0.32
0.83 ▽8 0.63 0.4* 0.4*
0.8 0.8 32 0.8 N6 0.5 0.8 N6 0.5 ▷ 2.5 12.5 6.3 3.2
1 63 1.6 N7 0.63 0.63
1.25 ▽7 1.25 0.8* 0.8*
1.6* 1.6 63 1.6 N7 1 1.6 N7 1
2 125 3.2 N8 1.25 1.25 ▷
▷		 6.3 3.2 1.6 0.8*
2.5 ▽6 2.5 1.6* 1.6*
3.2* 3.2 125 3.2 N8 2 3.2 ▷
▷		 N8 2
4 250 6.3 N9 2.5 2.5
5 ▽5 5 3.2* 3.2* ▷
▷
▷		 1.6 0.8 0.4 0.2
6.3* 6.3 250 6.3 N9 4 6.3 N9 4
8 500 12.5 N10 5 5
10 ▽4 10 6.3* 6.3*
12.5* 12.5 500 12.5 N10 8 12.5 ▷ N10 8 ▷
▷
▷
▷		 0.1 0.1 0.025
16 1000 25 N11 10 10
20 ▽3 20 12.5* 12.5*
25* 25 1000 25 N11 15 25 N11 16
32 2000 50 N12 20 20 **:source material stated 1.6,possibly misprinted
40 ▽2 40 25* 25* note: when choosing symbols from DIN3141--78, grade number must also be noted above the chosen symbol
50* 50 2000 50 N12 50 H12 32
63 40
80 ▽1 80 50*
100* 100 100 63
125 80
160 100*
200*
250
320 1. Note: Surface roughness without symbol means it has the same symbol given by GB131--83
400* 2.*Priority choice