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Materials
Generally Inner & Outer ring and Steel Ball are made of GCr15, whose chemical composition is as following:
Steel No. Chemical Composition(%)
GCr15 C Si Mn P S Cr
0.95-0.15 0.15-0.35 0.25-0.45 <=0.025 <=0.025 1.40-1.65
The contrast of Bearing Steel No. of each country is as following:
  CHINA JAPAN AMERICA GERMANY FRENCH
Bearing Steel (GB)GCr15 (JIS)SUJ2 (AISI)52100 (DIN)100Cr6 (NF)100C6
Stainless Steel (GB)9Cr18 (JIS)SUS440C (AISI)440C (DIN)WNr4535 (NF)Z100CD17
 
Accuracy
According to the International Standard, the Accuracy of Bearing can be divided into five grades: Normal Grade 0, High Grade 6, Accurate Grade 5, Over Accuracy Grade 4.
The Contrast of Bearing Accuracy is as following:
Country Standard Accuracy Grade
China GB/T307 0 6 5 4
International Standard Organization ISO 0 6 5 4
Sweden SKF P0 P6 P5 P4
Germany DIN P0 P6 P5 P4
Japan JIS P0 P6 P5 P4
American ANSI ABEC-1 ABEC-3 ABEC-5 ABEC-7
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Materials >> Clearance >>
Accuracy >> The Grease Types and Function >>
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