NSK Slewing Bearing

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A 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 Whee 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.

unic500 slewing bearing

20 mm 2.61 Hz
0.6 mm 0.04 kg

Premium Quality Thin Scetion Ungeared Slewing Ring Bearing

Presence With seal
[Metric Series] Metr Roller Follower

thin typemachinery parts slewing bearing

NTN 59 mm
50 mm 120 °C

Large 16 inch rotating plate Large slewing Bearing for Crane Trucks

3,800 rpm 4547359584486
0.91 Roller Bearings

single row ball mining equipment slewing bearing

0.10 Kg 40.39 mm
0.0538 15.499 mm

Crane turntable slewing ring bearing

EX202G2L4 -20 °C
61 mm 76 mm

39 mm x 72 mm x 37 mm 39 mm x 72 mm x 37 mm slew bearing Internal Gear

Double Stainless Steel
Deep Groove Ball Bea 6

slewing ring turntable bearing

6 No
Centre Height Used for Light load

Slewing Ring with External Gear

Open Type P4
100 Steel

Crawler Cranes slewing bearing turntable bearing

Open Type 60
Bearing for the main 9 Days or more

triple row roller slewing bearing ring

Single Row 17900
80 No