Koyo
FOR REFERENCE ONLY
  • Tapered roller bearings
  • Single-row
  • Metric series
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Bearing No. 30312JR

Specifications
(Boundary dimensions ...etc)

d(mm)60
D(mm)130
T(mm)33.5
B(mm)31
C(mm)26
r(min.)(mm)3
r1(min.)(mm)2.5
Basic load ratings : Cr(kN)217
Basic load ratings : C0r(kN)201
Fatigue load limit : Cu(kN)31.9
Limiting speeds(Grease lub.)(min-1)3100
Limiting speeds(Oil lub.)(min-1)4100
Load center spread : a(mm)26.9
Constant e()0.35
Axial load factors : Y1()1.74
Axial load factors : Y0()0.96

Mounting dimensions

da(min.)(mm)74
db(max.)(mm)77
Da(max.)(mm)118
Da(min.)(mm)112
Db(min.)(mm)120
Sa(min.)(mm)4
Sb(min.)(mm)7.5
ra(max.)(mm)2.5
rb(max.)(mm)2

Refer.

(Refer.)Mass(kg) 2.08
JTEKT

2025/05/29