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


Bearing No. 30308XR

Specification data (main 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)109
Basic load ratings : C0r(kN)98.5
Fatigue load limit : Cu(kN)14.8
Limiting speeds(Grease lub.)(min-1)4600
Limiting speeds(Oil lub.)(min-1)6100
Load center spread : a(mm)23.8
Constant e0.55
Axial load factors : Y11.10
Axial load factors : Y00.60

Mounting dimensions,weight (reference)

da(min.)(mm)50 mm
db(max.)(mm)53 mm
Da(max.)(mm)80 mm
da(min.)(mm)72 mm
db(min.)(mm)84 mm
Sa(min.)(mm)3 mm
Sb(min.)(mm)5 mm
ra(max.)(mm)2 mm
rb(max.)(mm)1.5 mm
Mass(Refer.)(kg)0.780 kg
JTEKT

2026/07/01