Single row sealed deep groove ball bearings d 8-9mm
Product Parameter
  • Basic size of mm
    d 8
    D 28
    B 9
  • The basic rated load is kN
    trends C 4.62
    static state Co 1.96
  • Fatigue load limit Pu 0.083
  • Rated rotation speed is r/min
    Refer to the speed 60000
    Limit speed 1) 30000
  • Mass kg 0.03
  • model
    Both sides are sealed 638-2RZ
    One side is sealed 638-RZ
  • Dimensions are mm
    d 8
    d1 ~ 14.8
    d2 ~ -
    D2 ~ 22.6
    r1,2 the min 0.3
  • Shoulder gear and chamfer size mm
    da the min 10.4
    da the max -
    Da the max 25.6
    ra the max 0.3
  • Calculation coefficient
    kr 0.025
    fo 12