Slewing Bearing – at the heart of what we do
Slewing bearing have driven the development of various industries, transformed transportation, and significantly improved the quality of human life. Since our founding, we have always adhered to the same vision: to optimize daily life with reliability and stability. To achieve this goal, we have developed high-performance slewing bearings for a variety of application scenarios and working conditions.
Want to know more about selecting slewing bearing?
Slewing bearing is a special bearing that can bear axial force, radial force and overturning moment at the same time. It consists of inner ring, outer ring, rolling element (steel ball or roller) and spacer block or cage, and is usually designed with large diameter to meet heavy load requirements. Slewing bearing is widely used in various engineering machinery and equipment, such as cranes, excavators, wind turbines, port machinery, etc., and can achieve precise slewing motion and load-bearing tasks.
Single row ball slewing bearing
The single-row ball slewing bearing adopts a single-circle steel ball rolling structure, which can simultaneously bear axial, radial loads and overturning moments. It has a compact structure and is easy to install, and is suitable for medium and light load applications.
Single row cross roller slewing bearing
The single-row cross-roller slewing bearing adopts a cross-arranged roller design, which can simultaneously bear large axial, radial loads and overturning moments. It has high rigidity and precision and is suitable for high-precision rotating equipment.
Double row ball slewing bearing
The double-row slewing bearing adopts a two-row rolling element design, which can simultaneously bear greater axial loads and overturning moments. It is suitable for heavy-duty applications, while maintaining structural stability and high load-bearing capacity.
Three-row roller slewing bearing
The three-row roller slewing bearing adopts a three-row independent roller structure design, which can simultaneously withstand axial, radial loads and overturning moments. It is especially suitable for occasions that require high stability and high loads.
Thin flange slewing ring bearing
The thin and light slewing bearing has a thin-walled structure and a small cross-section, is light in weight, and occupies less space. It is suitable for carrying medium and low loads and realizing the rotary motion of precise light mechanical equipment in a limited space.
OEM&ODM slewing bearing(crane、excavator)
Slewing bearings that support custom processing can be tailored to the specific needs of customers, covering multiple customization options such as size, material, rolling element type, seal design and surface treatment to meet the application requirements of different working conditions.
ZZ Slewing Bearing
More and more industries choose ZZ
We are constantly improving and innovating to make your application more efficient and faster!
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.