Koyo
FOR REFERENCE ONLY
  • Rolling mill roll neck bearings
  • Four-row tapered roller bearings


Bearing No. M252349D/310/310D

Specification data (main dimensions, etc.)

d(mm)269.875
D(mm)381.000
T(mm)282.575
W(mm)282.575
r(min.)(mm)3.2
r1(min.)(mm)3.2
Basic load ratings : Cr(kN)3150
Basic load ratings : C0r(kN)6690
Fatigue load limit : Cu(kN)697
Axial load factors : Y2(mm)2.03
Axial load factors : Y33.02
Axial load factors : Y01.98
Constant e0.33

Mounting dimensions,weight (reference)

da(min.)(mm)291 mm
Da(max.)(mm)367 mm
Da(max.)(mm)350 mm
S(min.)(mm)6 mm
ra(max.)(mm)3.2 mm
rb(max.)(mm)3.2 mm
Axial load factors : Y2(mm)2.03 mm
Axial load factors : Y33.02
Axial load factors : Y01.98
Constant e0.33
Mass(Refer.)(kg)98.4 kg
JTEKT

2026/07/07