Koyo
FOR REFERENCE ONLY
  • Tapered roller bearings
  • Single-row
  • Metric series
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Bearing No. 30311DJR

Specifications
(Boundary dimensions ...etc)

d(mm)55
D(mm)120
T(mm)31.5
B(mm)29
C(mm)21
r(min.)(mm)2.5
r1(min.)(mm)2
Basic load ratings : Cr(kN)161
Basic load ratings : C0r(kN)148
Fatigue load limit : Cu(kN)22.3
Limiting speeds(Grease lub.)(min-1)2900
Limiting speeds(Oil lub.)(min-1)4000
Load center spread : a(mm)38.4
Constant e()0.83
Axial load factors : Y1()0.73
Axial load factors : Y0()0.40

Mounting dimensions

da(min.)(mm)67
db(max.)(mm)68
Da(max.)(mm)108
Da(min.)(mm)94
Db(min.)(mm)113
Sa(min.)(mm)4
Sb(min.)(mm)10.5
ra(max.)(mm)2
rb(max.)(mm)2

Refer.

(Refer.)Mass(kg) 1.59
JTEKT

2025/06/01