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


Bearing No. 30208JR

Specification data (main dimensions, etc.)

d(mm)40
D(mm)80
T(mm)19.75
B(mm)18
C(mm)16
r(min.)(mm)1.5
r1(min.)(mm)1.5
Basic load ratings : Cr(kN)78.4
Basic load ratings : C0r(kN)69.2
Fatigue load limit : Cu(kN)10.3
Limiting speeds(Grease lub.)(min-1)5000
Limiting speeds(Oil lub.)(min-1)6700
Load center spread : a(mm)17.0
Constant e0.37
Axial load factors : Y11.60
Axial load factors : Y00.88

Mounting dimensions,weight (reference)

da(min.)(mm)48.5 mm
db(max.)(mm)49 mm
Da(max.)(mm)71.5 mm
da(min.)(mm)69 mm
db(min.)(mm)75 mm
Sa(min.)(mm)3 mm
Sb(min.)(mm)3.5 mm
ra(max.)(mm)1.5 mm
rb(max.)(mm)1.5 mm
Mass(Refer.)(kg)0.434 kg
JTEKT

2026/08/06