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


Bearing No. HM252348D/310/310D

Specification data (main dimensions, etc.)

d(mm)260.350
D(mm)422.275
T(mm)317.500
W(mm)314.325
r(min.)(mm)3.2
r1(min.)(mm)6.4
Basic load ratings : Cr(kN)3740
Basic load ratings : C0r(kN)6720
Fatigue load limit : Cu(kN)710
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)304 mm
Da(max.)(mm)407 mm
Da(max.)(mm)384 mm
S(min.)(mm)1 mm
ra(max.)(mm)3.2 mm
rb(max.)(mm)6.4 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)167 kg
JTEKT

2026/07/19