638/4-2Z
SIAIF 638/4-2Z
Type

Deep groove ball bearing

Model：638/4-2Z
Thickness(mm)：4
Inner diameter d：4
Outer diameter D：9
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Detailed information

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Basic size mm
  • d4
  • D9
  • B4
Basic load rating kN
  • DynamicsC0.54
  • Static Co0.18
RatedSpeed r/min
  • Reference speed140000
  • Limit speed 1) 70000
Model
  • Both side bandsSeals638/4-2Z
  • One side beltSeals-
Size mm
  • d4
  • d1 ～5.2
  • d2 ～-
  • D2 ～7.8
  • r 1,2 Minimum0.1
Shoulder and chamfer dimensions mm
  • d a Minimum4.6
  • d a Maximum-
  • Da Maximum8.4
  • r a Maximum0.1
Calculate coefficient
  • k r 0.015
  • fo10
Fatigue load limit Pu
  • Fatigue load limit Pu0.007
Quality kg
  • Quality kg0.0013

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