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


Bearing No. M257149D/110/110D

Specification data (main dimensions, etc.)

d(mm)304.800
D(mm)419.100
T(mm)269.875
W(mm)269.875
r(min.)(mm)6.4
r1(min.)(mm)1.6
Basic load ratings : Cr(kN)3030
Basic load ratings : C0r(kN)6950
Fatigue load limit : Cu(kN)699
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)331 mm
Da(max.)(mm)398 mm
Da(max.)(mm)387 mm
S(min.)(mm)7 mm
ra(max.)(mm)6.4 mm
rb(max.)(mm)1.6 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)110 kg
JTEKT

2026/07/22