Koyo
FOR REFERENCE ONLY
  • Tapered roller bearings
  • Single-row
  • Metric series
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Bearing No. 30211JR

Specifications
(Boundary dimensions ...etc)

d(mm)55
D(mm)100
T(mm)22.75
B(mm)21
C(mm)18
r(min.)(mm)2
r1(min.)(mm)1.5
Basic load ratings : Cr(kN)118
Basic load ratings : C0r(kN)113
Fatigue load limit : Cu(kN)17.3
Limiting speeds(Grease lub.)(min-1)3900
Limiting speeds(Oil lub.)(min-1)5200
Load center spread : a(mm)20.7
Constant e()0.40
Axial load factors : Y1()1.48
Axial load factors : Y0()0.81

Mounting dimensions

da(min.)(mm)65
db(max.)(mm)64
Da(max.)(mm)90
Da(min.)(mm)88
Db(min.)(mm)94
Sa(min.)(mm)4
Sb(min.)(mm)4.5
ra(max.)(mm)2
rb(max.)(mm)1.5

Refer.

(Refer.)Mass(kg) 0.732
JTEKT

2025/06/12