ISO 3290-1:2014 STANDARD (STEEL BALLS)
| Precision grade |
Variation of ball diameter (VDws)(µm) |
Deviation from spherical form (tDw)(µm) |
Surface roughness (Ra)(µm) |
Variation of ball lot diameter (VDwL)(µm) |
Gauge interval (IG) |
Description of preferred gauge |
Subgauge interval |
Description of subgauges (SG) |
| 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 |
