ZZ double row ball slewing bearings and three row roller slewing ring bearings are engineered for heavy-duty applications in construction and industrial machinery. The double row ball bearings feature precision-machined steel rings and high-strength balls, offering superior axial and radial load capacity for rotating tables, turntables, and platforms. Three row roller slewing bearings integrate three rows of rollers, efficiently supporting combined radial, axial, and tilting moment loads in demanding environments. Both bearing types are designed for excavators, cranes, concrete pumps, aerial work platforms, and other engineering machinery, ensuring smooth rotation, high durability, and low maintenance.
ZZ’s double row ball and three row roller slewing bearings provide reliable performance for heavy construction and industrial machinery. Engineers use these bearings in excavators, cranes, concrete pumps, and aerial work platforms. They ensure smooth rotation while supporting high loads.
The double row ball slewing bearings use two rows of high-strength balls on precision-machined raceways. This design handles both axial and radial loads efficiently. It also delivers stable rotation for turntables, platforms, and rotating tables. The three row roller bearings feature three rows of rollers. They distribute radial, axial, and tilting moment loads evenly. As a result, these bearings excel in the most demanding applications.
ZZ constructs each bearing from hardened, high-quality steel. Engineers apply advanced heat treatment to improve wear resistance. The bearings also include seals that prevent dust, dirt, and moisture from entering. These features reduce maintenance needs and extend service life. Moreover, ZZ provides multiple sizes and specifications. This flexibility fits a wide range of machinery, from small excavators to large cranes.
Customers rely on ZZ because of its commitment to quality and precision. Each bearing undergoes strict testing to ensure performance under dynamic and heavy loads. Therefore, operators experience smooth rotation, higher efficiency, and less downtime. In addition, the robust design and precise engineering guarantee long-term durability.
ZZ slewing bearings combine reliability and safety. For example, on cranes and concrete pumps, these bearings maintain stability during operation. They also improve machine productivity by handling extreme loads without failure. In short, choosing ZZ bearings ensures your machinery runs efficiently. Operators benefit from reduced maintenance, better safety, and enhanced performance.
To summarize, ZZ double row ball and three row roller slewing bearings offer top performance in engineering machinery. They support heavy loads, rotate smoothly, and last longer. With ZZ, manufacturers and operators gain high-quality bearings that optimize operational efficiency, stability, and safety.
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:
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:
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.
ZZ Slewing Bearing (Shanghai) Co., Ltd
Leading Slew Drive & Slewing Bearing Manufacturer in China.
ZZ products are applied globally in solar tracking systems, wind power systems, satellite communications, and numerous other globally connected industries.

