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Ceramic Balls

Carter is the premium supplier of the highest quality ceramic balls in the world. 

The quality of ceramic balls is absolutely critical for their performance. Carter has the best network of ceramic ball manufacturers in the world and can support any size requirement in a comprehensive range of precision classes. 
Carter Bearings provide a wide range of ceramic ball options across a variety of sizes. Material options include Silicon nitride (Si3N4), Zirconia (ZRO2) and Silicon carbide (SIC) from 0.4mm to just over 115mm in diameter with the most common sizes in between. Precision grades provided are 5, 10, 16, 25, and 100.

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Grade Sphericity [mm] Lot diameter variation [mm] Nominal ball diameter tolerance [mm] Maximum surface roughness (Ra) [µm]
3 0.00008 0.00008 ±0.0008 0.012
5 0.00013 0.00013 ±0.0013 0.02
10 0.00025 0.00025 ±0.0013 0.025
25 0.0006 0.0006 ±0.0025 0.051
50 0.0012 0.0012 ±0.0051 0.076
100 0.0025 0.0025 ±0.0127 0.127
200 0.005 0.005 ±0.025 0.203
1000 0.025 0.025 ±0.127  
Grade Size range [in] Sphericity [in] Lot diameter variation [in] Nominal ball diameter tolerance [in] Maximum surface roughness (Ra) [μin]
3 0.006–2 0.000003 0.000003 ±0.00003 0.5
5 0.006–6 0.000005 0.000005 ±0.00005 0.8
10 0.006–10 0.00001 0.00001 ±0.0001 1
25 0.006–10 0.000025 0.000025 ±0.0001 2
50 0.006–10 0.00005 0.00005 ±0.0003 3
100 0.006–10 0.0001 0.0001 ±0.0005 5
200 0.006–10 0.0002 0.0002 ±0.001 8
1000 0.006–10 0.001 0.001 ±0.005  
Material 52100 440C M50 BG-42 Si3N4
Hardness [HRC] 60 58 62 62 70
Temperature limit [°F] 300 300 400 400 1500
Corrosion resistance 1 3 1 2 5
Cost 1 1 1 2 5
Magnetic Magnetic Magnetic Magnetic Magnetic Non-magnetic
Electrical Conductivity Conductive Conductive Conductive Conductive Non-conductive
Relative load capacity 3 2 4 4 5
Relative fatigue life 3 2 4 4 5

 

Where 1 is lowest and 5 is highest. 

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