Koyo
FOR REFERENCE ONLY
  • Tapered roller bearings
  • Single-row
  • Metric series
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Bearing No. 31324JR

Specifications
(Boundary dimensions ...etc)

d(mm)120
D(mm)260
T(mm)68
B(mm)62
C(mm)42
r(min.)(mm)4
r1(min.)(mm)3
Basic load ratings : Cr(kN)657
Basic load ratings : C0r(kN)665
Fatigue load limit : Cu(kN)77.8
Limiting speeds(Grease lub.)(min-1)1300
Limiting speeds(Oil lub.)(min-1)1800
Load center spread : a(mm)81.9
Constant e()0.83
Axial load factors : Y1()0.73
Axial load factors : Y0()0.40

Mounting dimensions

da(min.)(mm)138
db(max.)(mm)145
Da(max.)(mm)246
Da(min.)(mm)221
Db(min.)(mm)244
Sa(min.)(mm)6
Sb(min.)(mm)21
ra(max.)(mm)3
rb(max.)(mm)2.5

Refer.

(Refer.)Mass(kg) 15.4
JTEKT

2025/06/18