Small Slewing Bearing

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Small slewing bearing or slew[ing] ring is a rotational rolling-element 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. (To "slew" means to turn without change of place.)

Compared to other rolling-element bearings, slewing bearings are thin in section and are often made in diameters of a metre or more; the slewing bearings on the Falkirk Wheel  are 4 metres diameter and fit over a 3.5 metre axle.

Slewing bearings often use two rows of rolling elements. They often use three race  elements, such as an inner ring and two outer ring "halves" that clamp together axially.

Slewing bearings are often made with gear teeth integral with the inner or outer race, used to drive the platform relative to the base.

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.

Slewing Ring for Tower Crane

8865590637300 PEER BEARING CO.
M06110 0.0

Slewing Bearing for CB2900

Cylindrical Roller B No
0662327058371 2.362 Inch | 60 Mill

Four Point Contact Slewing Bearings with Internal Gear Rks. 161.20.1904

8483.20.40.80 Flange Block Bearing
4 Bolt Round Flange N/A

Slewing Bearings Ring with External Gear 011.25.1800.000.11.1503

ABEC 1 | ISO P0 8482.10.50.68
No 12MM Bore; 21MM Outs

Slewing Ring Bearing for Stacker Reclaimer (XSA 20 1055N)

0.0 N/A
PEER BEARING CO. Bearings

Excavator Caterpillar Cat315/Cat317/Cat318 Slewing Bearing, Swing Circle, Slewing Ring

B04264 Bearings
BUNTING BEARING CORP BUNTING BEARINGS

Good Quality Spur Gear Slewing Drive Sp-I 0229

0 Inch | 0 Millimete 1 Piece Solid
Bearing 6 Bolt Round Flange

Excavator Hitachi Ex60-1 Slewing Ring, Swing Circle, Slewing Bearing

0.0 N/A
MOLINE BEARING MOLINE BEARING

Loader and Unloader Slewing Ring

FAG BEARING N/A
Single Row | Angular Metric

Single Row Four-Point Angular Contact Slewing Bearing Non-Gear

AA-627-3 Bearing
0.625 Inch | 15.875 84833080

Supply High Quality Slewing Ring for Stacker and Reclaimer

M06110 0
PEER BEARING CO. Bearings

Excavator Kobelco Sk235 Slewing Bearing, Slewing Ring, Swing Circle

Teflon Labyrinth 27.24
10.875 Inch | 276.22 QM INDUSTRIES
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