1. Characteristics of Various of Bearings
　

2. Material
-The rings, balls, needles and rollers of our bearings can be made of refining bearing steel AISI52100, stainless steel AISI440C, AISI420, etc.
-Cages are normally punch-pressed from brass strips H62 or steel strips 08, SPCC BQB402, as well as stainless steel strips AISI304, AISI302, fiber reinforced phenolic resin, plastics or copper stock, etc;
-The shields can be made of Japanese SPCC JISG3141 or stainless steel AISI304 or AISI302.
-Seals: synthetic rubber hot pressed with phosphatizing steel (AISI304 or AISI302 may used for stainless steel bearings) skeleton
The chemical composition of bearing steel and stainless steel are listed as follows:

3. Bearing Precision Grade

4. Rolling Bearing’s Tolerance
     Precision of radial bearings (excepting taper roller bearings)
     Precision of taper roller bearings
     Precision of thrust ball bearings
     Precision of conic bore radial bearings

5. Deep Groove Ball Bearing’s Vibration and Noise Class
The vibration and noise of deep groove ball bearings are normally classified as Z1, Z2(higher class than Z1), and Z3 (highest class). It is usually measured by instrument of SO910-1. While for bearings used for electric motors, the vibration & noise is measured by BVT-1 and classified as EMQ ZV1, ZV2 and ZV3. Customer needs to mark the requirement of vibration and noise class in order.

6. Bearing's Internal Radial Clearance of ...
     Deep Groove Ball Bearings
     Matched Angular Contact Ball Bearings
     Double Row Angular Contact Ball Bearings
     Self-aligning Ball Bearings
     Electrical Motor Bearings
     Cylindrical Roller Bearings Needle Roller Bearings
     Spherical Roller Bearings

7. ISO1132/GB4199 Bearing Tolerance Symbols Definitions

8. Characteristics of grease lubrication

9. inch-mm conversion table