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 |