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


Bearing No. 3581R/25

Specification data (main dimensions, etc.)

d(mm)34.925
D(mm)87.312
T(mm)30.162
B(mm)30.886
C(mm)23.812
r(min.)(mm)3.6
r1(min.)(mm)3.2
Basic load ratings : Cr(kN)120
Basic load ratings : C0r(kN)120
Fatigue load limit : Cu(kN)18.2
Limiting speeds(Grease lub.)(min-1)4600
Limiting speeds(Oil lub.)(min-1)6200
Load center spread : a(mm)20.5
Constant :e0.31
Axial load factors : Y11.96
Axial load factors : Y01.08

Mounting dimensions,weight (reference)

da(mm)48.0 mm
db(mm)45.5 mm
Da(mm)75.0 mm
Db(mm)81.0 mm
ra(max.)(mm)3.6 mm
rb(max.)(mm)3.2 mm
Mass(Refer.)(kg)0.922 kg
JTEKT

2026/07/08