Koyo
FOR REFERENCE ONLY
  • Tapered roller bearings
  • Single-row
  • Metric series
>

Bearing No. 30308JR

Specifications
(Boundary dimensions ...etc)

d(mm)40
D(mm)90
T(mm)25.25
B(mm)23
C(mm)20
r(min.)(mm)2
r1(min.)(mm)1.5
Basic load ratings : Cr(kN)113
Basic load ratings : C0r(kN)101
Fatigue load limit : Cu(kN)15.5
Limiting speeds(Grease lub.)(min-1)4500
Limiting speeds(Oil lub.)(min-1)6100
Load center spread : a(mm)19.9
Constant e()0.35
Axial load factors : Y1()1.74
Axial load factors : Y0()0.96

Mounting dimensions

da(min.)(mm)50
db(max.)(mm)52
Da(max.)(mm)80
Da(min.)(mm)77
Db(min.)(mm)82
Sa(min.)(mm)3
Sb(min.)(mm)5
ra(max.)(mm)2
rb(max.)(mm)1.5

Refer.

(Refer.)Mass(kg) 0.757
JTEKT

2025/06/01