Koyo
FOR REFERENCE ONLY
  • Tapered roller bearings
  • Single-row
  • Inch series


Bearing No. 641/633

Specification data (main dimensions, etc.)

d(mm)66.675
D(mm)130.175
T(mm)41.275
B(mm)41.275
C(mm)31.750
r(min.)(mm)3.6
r1(min.)(mm)3.2
Basic load ratings : Cr(kN)246
Basic load ratings : C0r(kN)267
Fatigue load limit : Cu(kN)41.8
Limiting speeds(Grease lub.)(min-1)3000
Limiting speeds(Oil lub.)(min-1)3900
Load center spread : a(mm)30.3
Constant :e0.36
Axial load factors : Y11.66
Axial load factors : Y00.91

Mounting dimensions,weight (reference)

da(mm)83.0 mm
db(mm)77.0 mm
Da(mm)116.0 mm
Db(mm)124.0 mm
ra(max.)(mm)3.6 mm
rb(max.)(mm)3.2 mm
Mass(Refer.)(kg)2.383 kg
JTEKT

2026/06/30