Slewing Bearing
Source slewing bearing from India's verified manufacturers and exporters on Himalay. Browse the full range for industrial and export applications.
About Slewing Bearing
Slewing bearings (slewing rings or turntable bearings) are large-diameter rolling bearings that carry combined axial, radial, and tilting-moment loads in a single unit while allowing slow rotation between two structures. They are the rotation joint in cranes, excavators, wind-turbine yaw and pitch systems, tunnel-boring machines, radar and solar trackers, and rotary tables, where a compact, bolt-mounted ring must support heavy overturning moments. Variants are defined chiefly by raceway geometry: single-row four-point-contact ball, double-row ball, crossed-roller, and three-row roller designs, each offering a different balance of moment capacity, rotational precision, and friction. Rings may be supplied as non-geared, external-geared, or internal-geared, with the gear cut to a module and quality grade for the drive pinion. Capacity is characterised on a static load-moment (tilting-moment) diagram rather than a single C0 figure, alongside bolt-circle dimensions, raceway hardness, and gear data. Ring material is typically 42CrMo4 / 50Mn forged or rolled steel, with raceways induction-hardened to a controlled case depth (commonly in the 55-62 HRC range) and a soft zone at the hardening gap. Seals, grease nipples, and lifting/mounting holes are integrated, and corrosion protection ranges from phosphating to zinc or paint systems. Through Himalay, partner manufacturers can typically supply forging material certificates to EN 10204 3.1 where specified, hardness and case-depth reports, dimensional and raceway runout inspection, and NDT such as MPI on the rings; RoHS/REACH and any project-specific documentation are coordinated as part of the standard order flow, with CE handled at the machine level.
