Koyo
FOR REFERENCE ONLY
  • Tapered roller bearings
  • Single-row
  • Metric series
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Bearing No. 303/28CR

Specifications
(Boundary dimensions ...etc)

d(mm)28
D(mm)68
T(mm)19.75
B(mm)18
C(mm)14
r(min.)(mm)1.5
r1(min.)(mm)1.5
Basic load ratings : Cr(kN)64.6
Basic load ratings : C0r(kN)50.2
Fatigue load limit : Cu(kN)7.25
Limiting speeds(Grease lub.)(min-1)6200
Limiting speeds(Oil lub.)(min-1)8200
Load center spread : a(mm)17.8
Constant e()0.55
Axial load factors : Y1()1.10
Axial load factors : Y0()0.60

Mounting dimensions

da(min.)(mm)36.5
db(max.)(mm)37
Da(max.)(mm)59.5
Da(min.)(mm)55
Db(min.)(mm)64
Sa(min.)(mm)3
Sb(min.)(mm)4.5
ra(max.)(mm)1.5
rb(max.)(mm)1.5

Refer.

(Refer.)Mass(kg) 0.332
JTEKT

2025/06/01