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


Bearing No. M263349D/310/310D

Specification data (main dimensions, etc.)

d(mm)355.600
D(mm)488.950
T(mm)317.500
W(mm)317.500
r(min.)(mm)3.2
r1(min.)(mm)1.6
Basic load ratings : Cr(kN)4690
Basic load ratings : C0r(kN)10900
Fatigue load limit : Cu(kN)1060
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)383 mm
Da(max.)(mm)474 mm
Da(max.)(mm)452 mm
S(min.)(mm)7.5 mm
ra(max.)(mm)3.2 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)182 kg
JTEKT

2026/07/23