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Grades and size:
Standard sizes range from 0.125" to 3.0" and smaller and larger sizes can be custom-made to your specifications. Refer to our Ball Grade table for the exact tolerances available.
Ball Grade table:
Grade | DIA. tolerance dws) <μm | Spherical tolerance (Sph) <μm | Surface Roughness (Ra) <μm |
G3 | 0.08 | 0.08 | 0.012 |
G5 | 0.13 | 0.13 | 0.02 |
G10 | 0.25 | 0.25 | 0.025 |
G16 | 0.4 | 0.4 | 0.032 |
G20 | 0.5 | 0.5 | 0.04 |
G28 | 0.7 | 0.7 | 0.05 |
G40 | 1 | 1 | 0.08 |
G60 | 1.5 | 1.5 | 0.1 |
G100 | 2.5 | 2.5 | 0.125 |
G200 | 5 | 5 | 0.2 |
Sizes available:
Size (inch) | Size (mm) | Size (inch) | Size (mm) |
1/16 ‘’ | 1.588 | 3/32 ‘’ | 2.381 |
1/8 ‘’ | 3.175 | 5/32‘’ | 3.969 |
3/16 ‘’ | 4.763 | 7/32‘’ | 5.556 |
1/4 ‘’ | 6.35 | 9/32 ‘’ | 7.144 |
5/16‘’ | 7.938 | 11/32 ‘’ | 8.731 |
3/8 ‘’ | 9.525 | 13/32 ‘’ | 10.319 |
7/16‘’ | 11.112 | 15/32‘’ | 11.906 |
1/2 ‘’ | 12.7 | 17/32‘’ | 13.494 |
9/16‘’ | 14.288 | 19/32‘’ | 15.081 |
5/8‘’ | 15.875 | 21/32‘’ | 16.669 |
11/16 ‘’ | 17.463 | 23/32‘’ | 18.256 |
3/4 ‘’ | 19.05 | 25/32‘’ | 19.844 |
13/16 ‘’ | 20.638 | 7/8 ‘’ | 22.225 |
15/16 ‘’ | 23.812 | 1‘’ | 25.4 |
Material properties:
Property | Typical Values |
Si3N4 [%] | 92 |
Density [g/cm3] | 3.2 |
Hardness [HV] | 1600 |
Elastic Modulus [GPa] | 320 |
Thermal Expansion Coefficient [10-6K-1] [RT to 800C] | 3.2 |
Compressive Strength [MPa] | 2800 |
Max. Useful Temperature [°C] | 1000 |
Fracture Toughness [Mpa.m0.5] | 6-8 |
Surface Finish Grade 5 G5[micron] | 0.005 |
Material Fatigue, Life Wear Resistance | <10x |
High precision Silicon Nitride bearing balls