Bearing Material
Bearing precision grade
Bearing Vibration
Bearing Tolerance
Bearing Lubrication
Bearing clearance

    Radial Internal Clearance of Deep Groove Ball Bearings
    Interchangeable Radial Clearance of Cylindrical Roller Bearings
    Un-interchangeable Radial Clearance of Cylindrical Roller Bearings
    Radial Internal Clearance of Double Row Cylindrical Roller Bearings (Cylindrical Bore)
    Radial Internal Clearance of Double Row Cylindrical Roller Bearings (Conical Bore)
    Radial Internal Clearance of Four Row Cylindrical Roller Bearings
    Radial Internal Clearance of Matched Angular Contact Ball Bearings
    Radial Internal Clearance of Double Row Angular Contact Ball Bearings
    Radial Internal Clearance of Self-aligning Ball Bearings
    Radial Internal Clearance of Electrical Motor Bearings (EMQ Bearings)

Bearing Material

* The rolling bearings can be made of refining bearing steel AISI52100 (or Chrome Steel GCr15), Stainless Steel AISI440C (or 9Cr18), etc.
* The cages are normally punch-pressed from brass strips H62 or steel strips 08, SPCC, as well as stainless steel strips AISI304, AISI302, fiber reinforced phenolic resin, plastics or copper stock, etc;
* The shields are noamlly made of Japanese SPCC or stainless steel AISI304 or AISI302.
* Seals: synthetic rubber hot pressed with phosphatizing steel skeleton.
stainless steel bearings may used AISI304 or AISI302 for skeleton of seals.
* The chemical composition as follows:

Chemical composition of bearing steel GCr15

Element(wt%) C0.95-1.05 Cr1.40-1.65 Si0.15-0.35 Mn 0.25-0.45 P≤0.027 S≤ 0.02 Element(wt%) Ni<0.23 Cu≤ 0.25 Mo≤ 0.1 Sn<0.03 As<0.04 Ti<0.005 Element(wt%) Sb<0.002 Pb<0.002 O<0.001 Al<0.05 Ca<0.01 -

Corresponding designation equivalent GCr15

CHINA ISO USA GERMANY JAPAN SWEDEN GCr15 683/XV Ⅱ 52100(ASTM) 100Cr6(DIN) SUJ2(JIS) SKF3

Staintess steel

Steel No. Chemical composition% C Si Mn P S Cr Mo AISI-440C 0.95-1.2 <1.0 <1.0 <0.04 <0.03 16-18 <0.75

Bearing precision grade

Standards Precision Grade GB G E D C B ISO Normal Class Class 6 Class 5 Class 4 Cleass 2 ANSI ABEC-1 ABEC-3 ABEC-5 ABEC-7 ABEC-9 DIN P0 P6 P5 P4 P2 JIS 0 6 5 4 2

Bearing Lubrication

Brand Designation Dropping Tem. ℃ Penetration at 25 ℃ WorkingTem. ℃ Remarks China Hangu Hangu 2 198 265~295 -10 ~130 Low noise service Chevron SRI-2 240 255~280 -30 ~120 Water resistant Esso Andok C 260 190~210 -30 ~120 General purpose Adnok 260 190 204~260 -40 ~120 Beacon 325 190 255~280 -54 ~120 Low Tem. service Mobil Mobilux 2 190 265~290 -10 ~110 General purpose Mobil 22 192 250~274 -40 ~120 Mobil 28 260 265~295 -55 ~175 Wide range Tem. service Mobil 48 260 240~270 -60 ~170 High Tem.service Shell Alvania R2 185 265~295 -35 ~120 General purpose Alvania R3 185 220~250 -35 ~135 Alvania RA 180 250~275 -25 ~100 Alvania EP1 180 310~340 -25 ~110 Alvania EP2 185 265~295 -25 ~110 Darina 2 250 265~295 -25 ~150 High Tem.  service Darina EP2 250 265~295 -25 ~150 Dolium R2 250 265~295 -35 ~150 Corrosion resistant Kyodo Yushi Multemp SRL 185 225~245 -40 ~145 Low torque service Multemp PS2 190 250~275 -50 ~110 Low Tem. service Multemp SC-A 260 255~280 0 ~160 High Tem. service Multemp ET150 260 255~280 -10 ~160 Kluber Isoflex LDS18 190 255~280 -50 ~110 Low Tem. service Isoflex NBU15 250 255~280 -30 ~120 General purpose