–The rings, balls, needles and rollers of KJ 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;
–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:
Steel No. | C% | Si% | Mn% | S% | P% | Cr% |
AISI52100 | 0.95-1.05 | 0.15-0.3 | 0.25-0.45 | <0.025 | <0.025 | 1.3-1.6 |
AISI440C | 0.90-1.05 | <0.8 | <0.8 | <0.04 | <0.03 | 16-19 |