Tower Crane Ball Bearing Slewing Ring , Cylindrical Roller Bearing ...
Slewing bearings have no gear, external gear and the internal gear type four point contact ball bearing, double row angular contact ball bearing, crossed ... Tower crane turntable bearing usually use small size four point contact ball slewing bearings or two volleyball turntable, a diameter of not more than 2 meters .
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adyrbearing's website is adyrbearing.com