Balls: Silicon Nitride |
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Material |
Size Range |
Grade |
Silicon Nitride |
1/32 - 2" (.0312mm - 50.8mm) |
3-24 |
Larger sizes available upon special order. Conforms to ASTM Specification F2094; Class I for Silicon Nitride. In addition we offer limited sizes in Class II materials. |
Specified for use in such high-technology industries such as hybrid bearings, aerospace and defense;
Silicon Nitride ceramic balls feature these advanced characteristics:
These outstanding properties, together with Hoover's exacting manufacturing standards regarding sphericity, diameter tolerance, and surface finish, make Hoover's silicon nitride balls ideal for high performance ball bearings.
Material Analysis |
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Grade |
Allowable Lot Diameter Variation |
Basic Diameter Tolerance |
Allowable Ball Gage Deviation High |
Allowable Ball Gage Deviation Low |
Max. Surface Roughness. Arithmetical Average. Micro-meters (Micro-inches) |
2C |
0.08 (3) |
±0.51 (±20) |
+0.51 (+20) |
-0.51 (-20) |
0.004 (0.15) |
3C |
0.13 (5) |
±0.51 (±20) |
+0.51 (+20) |
-0.51 (-20) |
0.004 (0.15) |
5C |
0.25 (10) |
±0.76 (±30) |
+0.76 (+30) |
-0.76 (-30) |
0.005 (0.20) |
10C |
0.51 (10) |
±2.54 (±100) |
+1.27 (+50) |
-1.02 (-40) |
0.006 (0.25) |
16C |
0.80 (32) |
±2.54 (±100) |
+1.27 (+50) |
-1.02 (-40) |
0.009 (0.35) |
24C |
1.22 (48) |
±2.54 (±100) |
+2.54 (+100) |
-2.54 (-100) |
0.013 (0.50) |
48C |
2.44 (96) |
N/A |
N/A |
N/A |
0.013 (0.50) |
Mechanical Properties |
Minimum |
Maximum |
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Density, g/cc (lb/ft3) |
3.0 (187) |
3.4 (212) |
Elastic Modulus, Gpa (ksi) |
270 (39150) |
330 (47850) |
Poisson’s ration |
0.23 |
0.29 |
Thermal Conductivity, W/m-ºK (Btu/h-ft-ºF) - @ 20ºC (Room Temp.) |
20 (11.5) |
38 (21.9) |
Specific Heat, J/kg-ºK (Btu/1bm-ºF) |
650 (0.167) |
800 (0.191) |
Coefficient of thermal expansion, x10-6/ºC (Room Temp. to 500ºC) |
2.3 |
3.4 |
Resistivity, Ohm-m |
1010 |
1016 |
Compressive Strength Mpa (ksi) |
3000 (435) |
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ASpecial material data should be obtained from individual suppliers. |
Please note that the material information provided on our website is for informational purposes only. The properties listed per product type are typical and can vary based on suppliers of raw materials and customer specific needs. Please contact customer service for verification prior to ordering. Price and delivery may be subject to change based on specific requirements.
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