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A slewing bearing or slew[ing] ring is a rotational rolling-element bearing or plain bearing that typically supports a heavy but slow-turning or slow-oscillating load, often a horizontal platform such as a conventional crane, a swing yarder, or the wind-facing platform of a horizontal-axis windmill. 

As for other bearings that reciprocate, rather than rotating continuously, lubrication can be difficult. The oil wedge built up in a continuously rotating bearing is disrupted by the stop start motion of slewing. Instead, a hydrostatic bearing with pumped oil flow may be used.


Double row ball slewing bearing (External gear type)

Dimension and Parameters
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Double row ball slewing bearing (External gear type) Double row ball slewing bearing (External gear type)
E.712.2.25.12.D.6
  • Designations :
    E.712.2.25.12.D.6
  • Boundary Dimension (mm)
  • Da :
    712
  • Di :
    470
  • H :
    98
  • Bolt Hole Diameter (mm)
  • La :
    24
  • Li :
    17
  • na3) :
    24
  • ni3) :
    17
  • m :
    8
  • z :
    87
  • Weight
  • (Kg) :
    103