Koyo
FOR REFERENCE ONLY
  • Rolling mill roll neck bearings
  • Four-row tapered roller bearings
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Bearing No. M257248D/210/210D

Specifications
(Boundary dimensions ...etc)

d(mm)304.902
D(mm)412.648
T(mm)266.700
W(mm)266.700
r(min.)(mm)3.2
r1(min.)(mm)3.2
Basic load ratings : Cr(kN)3210
Basic load ratings : C0r(kN)7280
Fatigue load limit : Cu(kN)746
Axial load factors : Y2(mm)2.12
Axial load factors : Y3()3.15
Axial load factors : Y0()2.07
Constant e()0.32

Mounting dimensions

da(min.)(mm)328
Da(max.)(mm)398
Da(max.)(mm)383
S(min.)(mm)7
ra(max.)(mm)3.2
rb(max.)(mm)3.2
Axial load factors : Y2(mm)2.12
Axial load factors : Y3()3.15
Axial load factors : Y0()2.07
Constant e()0.32

Refer.

(Refer.)Mass(kg) 101
JTEKT

2025/06/01