Product Details

slewing ring bearing

Slewing ring bearing, designed to handle axial, radial, and overturning moments, is essential in heavy machinery such as excavators, cranes, and wind turbines. It features high load capacity, durability, and smooth rotation. Made from high-strength materials, it ensures long-term operation under heavy loads, and requires regular lubrication, seal inspection, and load monitoring for optimal performance.

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Specification

A slewing ring bearing is a large bearing specifically designed to withstand axial, radial, and overturning moments, widely used in heavy machinery and industrial equipment. Its main components include inner and outer rings, rolling elements (such as balls or rollers), cages, and seals. Depending on the structure and application, slewing ring bearings are classified into single-row four-point contact ball bearings, double-row ball bearings, cross roller bearings, and three-row roller bearings. Different types of bearings are suitable for various loads and application scenarios.

Slewing ring bearings are extensively used in construction machinery (e.g., excavators, cranes, tower cranes), wind power equipment (e.g., wind turbine rotors and yaw systems), medical equipment (e.g., CT scanners and radiotherapy equipment), and industrial machinery (e.g., rotary tables and robotic joints). Their features include high load capacity, smooth rotation, durability, and easy installation. High-quality slewing ring bearings are made from high-strength materials and precise manufacturing processes, ensuring long-term stable operation under heavy load conditions.

The key to maintaining slewing ring bearings lies in regular lubrication, seal inspection, and load monitoring. Regular lubrication ensures the smooth operation of rolling elements and raceways, extending bearing life; seal inspection prevents contaminants from entering the bearing; load monitoring avoids overloading, ensuring the bearing operates within its design load range. Proper selection and maintenance of slewing ring bearings can significantly enhance equipment performance and longevity.

No.
DL
mm		Ring DimensionGear ParameterGear TorqueN.W
kg
De
mm		D
mm		d
mm		H
mm		b
mm		m
mm		zxkNormalizing
kN		Q&T
kN
021.25.500644616384106605126+0.50.13752130
022.25.500646. 8616384106606105+0.50.14562130
021.25.560704676444106605138+0.50.13752146
022.25.560706. 8676444106606115+0.50.14562147
021.25.630790. 8746514106606129+0.50.14562173
022.25.630790. 474651410660896+0.50.16083170
021.25.710862. 8826594106606141+0.50.14562190
022.25.710862. 4826594106608105+0.50.16083187
021.30.800982. 4942658124808120+0.50.180111305
022.30.800988942658124801096+0.50.1100140307
021.30.9001086.41042758124808133+0.50.180111349
022.30.900108810427581248010106+0.50.1100140348
021.30.1000119811428581248010117+0.50.1100140396
022.30.10001197.61142858124801297+0.50.1120167391
021.30.1120131812629781248010129+0.50.1100140445
022.30.11201317.612629781248012107+0.50.1120167439
021.40.12501497.6142610741609012122+0.50.1135188784
022.40.12501495.2142610741609014104+0.50.1158219774
021.40.14001641.6157612241609012134+0.50.1135188870
022.40.14001649.2157612241609014115+0.50.1158219878
021.40.16001845.2177614241609014129+0.50.1158219995
022.40.16001852.8177614241609016113+0.50.11812501003
021.40.18002055.2197616241609014144+0.50.11582191147
022.40.18002060.8197616241609016126+0.50.11812501151
021.50.20002300.82215178519012016141+0.50.12413331794
022.50.20002300.42215178519012018125+0.50.12713751780
021.50.22402540.82455202519012016156+0.50.12413332017
022.50.22402552.42455202519012018139+0.50.12713752048
021.50.25002804.42715228519012018153+0.50.12713752246
022.50.250028162715228519012020138+0.50.13014182280
021.50.28003110.43015258519012018170+0.50.12713752553
022.50.280031163015258519012020153+0.50.13014182563
021.60.315035363428287222615020174+0.50.13775224428
022.60.31503537.63429287322715122158+0.50.14155744414
021.60.355039363828327222615020194+0.50.13775225012
022.60.35503933.63828327222615022176+0.50.14155744967
021.60.40004395.64278372222615022197+0.50.14155745706
022.60.400043954278372222615025173+0.50.14716525656
021.60.45004879.64778422222615022219+0.50.14155746293
022.60.450048954778422222615025193+0.50.14716526385

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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.

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.

Industries

Forestry Machine

Port Machine

Welding Machine

CSP Tracking

Aerial Work Platform

Medical Devices

Construction

Mining Machine

Machine Tools + Automation

PV Tracking

Robotics

Truck Crane

prodcuts

Slew Drive

Bearing

Slewing Bearing

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