ZZ Slewing Bearing

Slewing Bearing Size Chart

Slewing bearings, also known as slewing ring bearings, are large-sized bearings designed to handle axial, radial, and moment loads simultaneously. These bearings are typically used in applications where rotating large structures or equipment is necessary, such as in cranes, excavators, wind turbines, and rotating platforms.

Here’s a general size chart for slewing bearings, though specific dimensions may vary depending on the manufacturer and application:

Slewing Bearing Size Chart

Key Dimensions

  • Bore Diameter (d): The inner diameter of the slewing bearing.
  • Outer Diameter (D): The total outer diameter.
  • Height (H): The height or thickness of the bearing.

Load Capacity:

  • Axial Load Capacity: The maximum load the bearing can handle in the axial direction.
  • Radial Load Capacity: The load the bearing can handle in the radial direction.

Common Slewing Bearing Types

  • Single-row four-point contact ball bearing
  • Single-row crossed roller bearing
  • Double-row ball bearing
  • Three-row roller bearing

Application-Specific Variations:

  • Light-duty slewing bearings for smaller applications.
  • Heavy-duty slewing bearings for high-load applications such as construction and offshore platforms.

Dimensions, tolerances and load capacities may vary from manufacturer to manufacturer, please contact us for the latest product datasheet.

Frequently Asked Questions

Expert Insights and Reliable Solutions to Your Most Common Questions.

ZZ Slewing Bearing supplies a full range of slewing bearings to meet different industrial needs:

  • Single row four point contact slewing bearings Application: medium loads, precise rotation.
  • Double row ball bearings  Application: higher radial and axial loads.
  • Cross roller bearings –Application: high rigidity, suitable for robots and machining centers.
  • Three row roller bearings – Application: extreme loads in heavy equipment.
  • Ball combine roller bearings –Application:  precise rotational adjustment applications.
  • Customized bearings – tailored for specific equipment requirements.

Typical selection parameter for ZZ clients:

Load type: axial, radial, and tilting moment.

Rotation RPM: ensures long service life.

Installation space & mounting dimensions: inner/outer ring diameter, bolt circle.

Precision & rigidity requirements: critical for cranes, excavators, and robots.

ZZ engineers provide professional selection guidance according to your equipment and drawings.

ZZ Slewing Bearing selects materials for strength, wear resistance, and long-term durability:

Slewing ring: 42CrMo, 50Mn, C45N, 40CrNiMo, C48E.

Special forging spare parts: carburized/hardened steels for gear teeth (20CrMnTi, 18CrNiMo7‑6).

Corrosion resistant: SS 304, 316L, duplex stainless steel.

Surface treatments: heat treatment, quenching, carburizing, induction hardening, and surface coating(Four-Layer Packing, Strong Anti-Rust Oil, Black Oxide Treatment, Jet Black Paint Finish, Hot-Dip Galvanizing (CGL), Electro-Galvanizing (EGL), Hot-Dip Galvanizing + Paint Finish)

Correct installation with flat surfaces.

Proper lubrication using grease.

Avoid overloading or shock loads over capacity.

Monitor operating conditions regularly to prevent debris entry.

Typical factors observed by ZZ engineers:

  • Insufficient or incorrect lubrication.
  • (dust, metal particles) in raceways.
  • Rolling element or track damage.
  • Uneven mounting surfaces or misalignment.
  • Incorrect bolt torque(below grade 8.8) or preloading.

In-stock: 3–7 days.

Custom: 2–6 weeks depending on size, load, and precision.

Warranty: 1 year

Lifetime Free Spare Parts: Glue, seals, steel ball

Yes — ZZ Slewing Bearing offers:

Detailed installation manuals.

Online engineering support.

Guidance for lubrication, maintenance, and troubleshooting solution.

Full range of materials and heat treatments for various load conditions.

High precision and strict quality inspection standards.

Engineering support before and after delivery.

Customization to exact equipment requirements.

Proven performance in cranes, excavators, robotics, wind turbines, and heavy machinery etc.

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