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STANDARD



ISO 3290-1 INTERNATIONAL STANDARD
ISO 3290-1:2014 STANDARD(STEEL BALL)
Precision grade
Variation of ball diameter (VDws)(µm)(a)
Deviation from spherical form (tDw)(µm) (a)
Surface roughness (Ra)(µm) (a)
Variation of ball lot diameter (VDwL)(µm)
Gauge interval (IG)
Description of preferred gauge
Subgauge interval
Description of subgauges
3
0.08
0.08
0.010
0.13
0.5
-5~-0.5,0,+0.5~+5
0.1
-0.2,-0.1,0,0.1,0.2
5
0.13
0.13
0.014
0.25
1
-5~-1,0,+1~+5
0.2
-0.4,-0.2,0,0.2,0.4
10
0.25
0.25
0.020
0.5
1
-9~-1,0,+1~+9
0.2
-0.4,-0.2,0,0.2,0.4
16
0.4
0.4
0.025
0.8
2
-10~-2,0,+2~+10
0.4
-0.8,-0.4,0,0.4,0.8
20
0.5
0.5
0.032
1
2
-10~-2,0,+2~+10
0.4
-0.8,-0.4,0,0.4,0.8
24
0.6
0.6
0.040
1.2
2
-12~-2,0,-2~-12
0.4
-0.8,-0.4,0,0.4,0.8
28
0.7
0.7
0.050
1.4
2
-12~-2,0,-2~-12
0.4
-0.8,-0.4,0,0.4,0.8
40
1
1
0.060
2
4
-16~-4,0,+4~+16
0.8
-1.6,-0.8,0,0.8,1.6
60
1.5
1.5
0.080
3
6
-18~-6,0,+6~+18
1.2
-2.4,-1.2,0,1.2,2.4
100
2.5
2.5
0.100
5
10
-40~-10,0,+10~+40
2.0
-4,-2,0,2,4
200
5
5
0.150
10
15
-60~-15,0,+15~+60
3.0
-6,-3,0,3,6





ISO 3290-2 INTERNATIONAL STANDARD
ISO 3290-2:2014 STANDARD(CERAMIC BALLS: SILICON NITRIDE)
Precision grade
Variation of ball diameter (VDws)(µm)(a)
Deviation from spherical form (tDw)(µm) (a)
Surface roughness (Ra)(µm) (a)
Variation of ball lot diameter (VDwL)(µm)
Gauge interval (IG)
Description of preferred gauge
Subgauge interval
Description of subgauges
3
0.08
0.08
0.010
0.13
0.5
-5~-0.5,0,+0.5~+5
0.1
-0.2,-0.1,0,0.1,0.2
5
0.13
0.13
0.014
0.25
1
-5~-1,0,+1~+5
0.2
-0.4,-0.2,0,0.2,0.4
10
0.25
0.25
0.020
0.5
1
-9~-1,0,+1~+9
0.2
-0.4,-0.2,0,0.2,0.4
16
0.4
0.4
0.025
0.8
2
-10~-2,0,+2~+10
0.4
-0.8,-0.4,0,0.4,0.8
20
0.5
0.5
0.032
1
2
-10~-2,0,+2~+10
0.4
-0.8,-0.4,0,0.4,0.8
24
0.6
0.6
0.040
1.2
2
-12~-2,0,-2~-12
0.4
-0.8,-0.4,0,0.4,0.8
28
0.7
0.7
0.050
1.4
2
-12~-2,0,-2~-12
0.4
-0.8,-0.4,0,0.4,0.8
40
1
1
0.060
2
4
-16~-4,0,+4~+16
0.8
-1.6,-0.8,0,0.8,1.6
60
1.5
1.5
0.080
3
6
-18~-6,0,+6~+18
1.2
-2.4,-1.2,0,1.2,2.4
100
2.5
2.5
0.100
5
10
-40~-10,0,+10~+40
2.0
-4,-2,0,2,4