China factory Internal Gear Slewing Bearing I. 855.25.00. B Slewing Ring Bearing I. 955.25.00. B

Product Description

Technical parameter for 4 point contact ball ring bearing, slewing ring, swing Bearing, slewing gear


1 Type four point contact ball type slewing bearing, ring bearing, slewing gear
2 Model  I.855.25.00.B I.955.25.00.B
3 Bore diameter(mm) 610 710
4 Outside diameter(mm) 853 953
5 Height(mm) 80 80
6 Material 42CrMo, 50Mn
7 Precision P0. P6. P5.
8 Cage/retainer Nylon or aluminum
9 Gear type internal gear teeth
10 N.W.(kgs) 119 137

Model  Dimension(mm)
Da Di H
(Serie E.20.B) external gear 
E.505.20.00.B 503.3 342 56
E.650.20.00.B 640.3 472 56
E.750.20.00.B 742.3 572 56
E.850.20.00.B 838.1 672 56
E.950.20.00.B 950.1 772 56
E.1050.20.00.B 1046.1 872 56
E.1200.20.00.B 1198.1 1571 56
(Serie E.25.B) external gear 
E.900.25.00.B 898 655 80
E.1000.25.00.B 997 755 80
E.1100.25.00.B 1096 855 80
E.1200.25.00.B 1198 955 80
Model  Dimension(mm)
Da Di H
(Serie I.20.B)  internal gear 
I.486.20.00.B 486 325 56
I.616.20.00.B 616 444 56
I.716.20.00.B 716 546 56
I.816.20.00.B 816 648 56
I.916.20.00.B 916 736 56
I.1016.20.00.B 1016 840 56
I.1166.20.00.B 1166 984 56
(Serie I.25.B) internal gear 
I.900.25.00.B 855 610 80
I.1000.25.00.B 955 710 80
I.1100.25.00.B 1055 810 80
I.1200.25.00.B 1155 910 80
Model  Dimension(mm)
Da Di H
(Serie SD.20.B)  none gear 
SD.486.20.00.B 486 342 56
SD.616.20.00.B 616 472 56
SD.716.20.00.B 716 572 56
SD.816.20.00.B 816 672 56
SD.916.20.00.B 916 772 56
SD.1016.20.00.B 1016 872 56
SD.1166.20.00.B 1166 1571 56
(Serie SD.25.B) none gear 
SD.855.25.00.B 855 655 63
SD.955.25.00.B 955 755 63
SD.1055.25.00.B 1055 855 63
SD.1155.25.00.B 1155 955 63

Why choose CHINAMFG slewing bearings
A CHINAMFG in slewing bearing field, rich experience, can do design, produce, mounting guide
Small order accepted
ISO certified company
Variorum models
7*24hours hotline to help you with your cranes
Strict quality control system to ensure quality for slewing bearing

LYHY Slewing Bearing Types
LYHY slewing bearings can be divided into the following types as per  their structures:
single row 4 point contact ball slewing bearing,
single row cross roller slewing bearing,
double row different ball diameter slewing bearing,
3 row cylindrical roller slewing bearing and roller/ball combination slewing bearing.
And all these types of slewing bearings can be further divided into bearings without gears, bearings with external gears and bearings with internal gears.

Detailed description of these types slewing bearings

Single row 4 point contact ball slewing bearings
     This kind of slewing bearings can support high dynamic loads, transmitting axial and radial forces simultaneously as well as the resulting tilting moments. Applications of this kind of bearings are hoisting, mechanical handling and general mechanical engineering etc.
Single row cross roller slewing bearings
     This kind of bearings can support combinations of large radial force, medium axial force and tilting moment with small or zero clearance. Main applications of this kind of bearings are hoisting and mechanical handling and general mechanical engineering etc.
Double row different ball diameter slewing bearings
     This kind of bearings can support high static loads with simple structures. They are mainly used in situations with variation load position and direction and continuously rotating. Main applications of this kind of bearings are deck hoisting, mining and material handling etc.
Triple row cylindrical roller slewing bearings
     This kind of bearings has high load carrying capacity. Under same loads, this kind of bearings has much smaller diameters which can make the installation much compact, as different kinds of loads are supported by different races and rollers. Main applications of this kind of bearings are hoisting, mechanical handling, mining and materials handling, offshore technology and general mechanical engineering etc.
Roller/ball combination slewing bearings
     This kind of bearings can support high axial load and low tilting moments. Usually they are large diameter slewing bearings. Applications of this kind of bearings are mining and materials handling etc.

About CHINAMFG bearings
1.introduction:we are a manufacturer of slewing bearing since 1993, our factory occupies a area of 30000square meters with 4 workshop and 1 office building. 
2. Featured products: slewing bearing and slewing drive
3. Capital: Current is 1 million RMB, but we are increasing the capital to 10 million RMB
4. Workers: 40
5. Certificate: ISO9001:2008, 3.1 certificate, CCS certificate, Science and Technology Progress Award
6. Annual Exportation: 8million USD
7. Exported countries: (39)
Asia: India, Pakistan, Iran, Signore, Georgia, Malaysia, Vietnam, Thailand, Philippines, Israel, Korea, UAE, Sri Lanka, Saudi Arabia,
Europe: Turkey, Russia, Spain, Czech Republic, Italy, Poland, Slovakia, Bosnia and Herzegovina, Austria, France, Germany, Switzerland, Finland, Ukraine, UK
America: USA, Canada, Mexico, Brazil, Puerto Rico, Peru, Chile
Africa: South Africa, Egypt
Oceania: Australia

Flange Slewing Bearing
Introduction of CHINAMFG flange slewing bearings
CHINAMFG is a professional manufacturer in slewing ring bearings since 1993. We can also design and make other standard and non-standard ball bearings, roller bearings and precision bearings as per customer’s different technical requirements.
Slewing bearing is also called slewing ring, slewing ring bearing, turntable bearing, and rotary bearing.
Flange slewing bearing is a special slewing ring bearing, it can have 1 flange in the outer ring, or 1 flange in the inner ring, even it can have 1 flange in both inner ring and outer ring.

Flange slewing bearing has 3 different types:
Flange slewing bearing with no gear
Flange slewing bearing with external gear
Flange slewing bearing with internal gear

Flange slewing bearings have following features:
Compact structure and easily installment.

Flange slewing bearings are widely used in tow truck, and other applications are the same as slewing bearings, such as lifting & transport machinery, mining machinery, construction machinery, excavator, concrete machine, paper machine, plastic and rubber machine and steel plant.

Packaging Details for large diameter slewing bearing with pinion
1). Bearing surface is covered with the anti-rust oil first; And then wrapped with the plastic film;
2). And then packed with Kraft paper and professional belts;
3). At last, with wooden box totally at the outer packing to invoid the rust or the moist;
4). We can depend on the customers demand to be packed;

All CHINAMFG slewing ring bearings can be usually delivered timely, usual production time is 15-50 days based on different slew bearings diameters, sometimes slew rings will be in stock.
Slewing bearings can be offered different delivery terms, such as EXW, FOB, CIF, DDU and so on. 
Also, slewing rings can be transported by different transport ways, by express (such as DHL, TNT, UPS, FEDEX and so on), by air, by sea, by truck, by railway and so on.


Make sure that the model is correct and slewing bearing isn’t damaged during transportation.
2.  Check the appearance and rotational state of the bearing, such as rotational precision clearance, rotating flexibility, seals position, lubrication grease etc.
3.  The installation datum plane and bracket installing plane should be clean, grease, burr, paint and other foreign body should be wiped off.


1. The screws in the installing plane should be fit with the mounting holes in the slewing bearing
2.  The slewing bearing has a soft zone marked with an “s” on the upper surface, when installing the bearing, it is important to ensure that this area is placed in a non-load or infrequent load zone.
3.  When the bearing is placed on the supporting frame work it is important to check the interface between these 2 surfaces. This check should be carried out with the insertion of feel gauges between the 2 surfaces. If a gap should exist then it is recommended to plane/resurface the effective area so as to remove the gap.
4.  Install slewing bearing with high strength screws, and choose appropriate strength bolts. All bolts are required to be tightened evenly. The sequence of this tightening process is shown in Pic. Welding of bearing is not allowed, in the event of welding any adjacent parts, heat transfer shall be avoided so as to cause the bearing to become deformed or change the hardness.
5.  After installation, the bearing should be rotated to check for smooth operation and any emission of unusual noise. If either of the aforementioned are noted, then the bearing should be adjusted to eliminate them. The teeth of the largest run-out are coated with green paint.


Q: Are LYHY BEARINGS trading company or manufacturer?
A: LYHY BEARINGS is a professional manufacturer for slewing bearings, thin section bearings, ball bearings and rolling bearings

Q: How do LYHY BEARINGS control quality of their bearing?
A: LYHY BEARINGS has established strict quality control systems, all the products and services has passed ISO9001-2008 Quality Certificate and third party such as CCS, LR,ABS,BV

Q: What is the MOQ?
A: MOQ is 1pc, pls message us for detailed information.

Q: How about the package for CHINAMFG bearings?
A: Standard Industrial packing in general condition (Plastic tube+ professional plastic belts+ plywood case). Accept design package when OEM.

Q: How long is the production time?
A: It takes about 7-40 days, depends on the model and quantity.

Q: How about the shipping?
A: We can arrange the shipment or you may have your own forwarder.

Q: Is sample available?
A: Yes, sample order is acceptable.

Q: Can we use our own LOGO or design on bearings?
A: Yes. OEM is acceptable for LYHY BEARINGS. We can design as per your requirements and use your own LOGO and package design.
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Standard or Nonstandard: Standard
Feature: Corrosion-Resistant
Sealing Gland: Sealed On Both Sides
Rolling-Element Number: Single-Row
Roller Type: Four Point Contact Ball
Material: 50mn, 42CrMo
US$ 590/Piece
1 Piece(Min.Order)




How do slewing rings contribute to precise and controlled motion in machinery?

Slewing rings play a crucial role in enabling precise and controlled motion in machinery. Their design and functionality contribute to achieving accurate positioning, smooth rotation, and controlled movement. Here’s a detailed explanation of how slewing rings contribute to precise and controlled motion:

  • Precision Engineering: Slewing rings are meticulously engineered to provide high precision in motion control. The manufacturing processes involve tight tolerances and precise machining to ensure accurate dimensions and alignment of the rolling elements and raceways. This precision engineering minimizes any deviations or errors in motion, allowing for precise positioning and controlled movement.
  • Low Friction and Smooth Rotation: Slewing rings are designed to minimize friction and enable smooth rotation. The rolling elements, whether balls or rollers, are precisely positioned and guided within the raceways of the slewing ring. This design ensures that the rolling elements make contact with the raceways at specific angles, reducing friction during rotation. The low-friction characteristics allow for smooth and controlled motion, enabling precise positioning without undue resistance or jerky movements.
  • Integrated Gear Mechanism: Many slewing rings are equipped with an integrated gear mechanism. The gear teeth on the inner or outer ring of the slewing ring engage with external gears or pinions, providing a means to transmit torque and control rotational motion. The gear mechanism allows for precise and controlled movement, enabling operators or automated systems to achieve accurate positioning and controlled rotation at desired speeds.
  • Backlash Control: Backlash refers to the slight play or clearance between mating gears or components. Slewing rings are designed to minimize backlash, particularly in applications that require precise motion control. By reducing or eliminating backlash, slewing rings ensure that there is minimal lost motion or error when initiating rotational movement or changing direction. This feature contributes to improved accuracy and controlled motion.
  • Stiffness and Rigidity: Slewing rings are designed to provide high stiffness and rigidity, minimizing deflection or deformation during operation. This characteristic is especially important in applications where precise and controlled motion is required. The high stiffness of slewing rings ensures that the applied forces and torques are efficiently transmitted, allowing for accurate positioning and controlled motion without significant distortion or flexing.
  • Positioning Sensors and Feedback Systems: In conjunction with slewing rings, machinery often incorporates positioning sensors and feedback systems. These sensors and systems provide real-time data on the position, speed, and rotation of the slewing ring. By continuously monitoring and adjusting the motion based on the feedback, precise and controlled movement can be achieved, enabling accurate positioning and motion control.

Overall, slewing rings contribute to precise and controlled motion in machinery through their precision engineering, low friction, integrated gear mechanisms, backlash control, stiffness, and compatibility with positioning sensors and feedback systems. These features ensure accurate positioning, smooth rotation, and controlled movement, making slewing rings essential components for applications that require precise motion control in various industries such as construction, material handling, robotics, and manufacturing.

What is a slewing ring, and how is it used in mechanical systems?

A slewing ring, also known as a slewing bearing or turntable bearing, is a specialized type of rolling element bearing that enables rotational movement between two components. It consists of an inner ring, an outer ring, rolling elements (such as balls or rollers), and often a gear mechanism. Slewing rings are used in mechanical systems where there is a need for smooth and controlled rotation. Here’s a detailed explanation of what a slewing ring is and how it is used:

  • Structure and Components: A slewing ring typically has a large diameter compared to its thickness, allowing it to support axial, radial, and moment loads. The inner and outer rings have raceways that the rolling elements move along. The rolling elements, which can be balls or rollers, distribute the load and facilitate smooth rotation. In some cases, a gear mechanism is integrated into the slewing ring, allowing it to act as a rotational drive system.
  • Rotational Movement: The primary function of a slewing ring is to enable rotational movement between two components. It provides a stable and low-friction interface that allows one component to rotate relative to the other. The rolling elements within the raceways minimize friction and distribute the load evenly, resulting in smooth and controlled rotation. Slewing rings can support both continuous rotation and intermittent or oscillating movement, depending on the application requirements.
  • Load Support: Slewing rings are designed to support various types of loads. They can handle axial loads, which are forces acting parallel to the axis of rotation, as well as radial loads, which are forces acting perpendicular to the axis of rotation. Additionally, slewing rings can accommodate moment loads, which are a combination of axial and radial loads that create bending or twisting forces. The load-carrying capacity of a slewing ring depends on factors such as its size, design, and choice of rolling elements.
  • Applications: Slewing rings find applications in a wide range of mechanical systems across different industries. Some common uses include:
  • Construction and Cranes: Slewing rings are extensively used in construction machinery, cranes, and mobile equipment. They enable 360-degree rotation of the boom or jib, allowing for efficient material handling and positioning.
  • Wind Turbines: Slewing rings are crucial components in wind turbine systems. They support the rotor, allowing it to rotate according to wind direction, and provide a connection between the rotor and the nacelle, enabling yaw movement.
  • Industrial Equipment: Slewing rings are utilized in various industrial equipment, including indexing tables, turntables, robotic arms, and packaging machinery. They facilitate precise and controlled rotation in these applications.
  • Transportation and Automotive: Slewing rings are employed in transportation and automotive applications, such as vehicle cranes, aerial platforms, and rotating platforms for heavy-duty vehicles. They enable safe and smooth rotation in these specialized systems.
  • Medical and Rehabilitation Equipment: Slewing rings are used in medical and rehabilitation equipment, such as patient lifts and adjustable beds. They allow for smooth and controlled movement, aiding in patient care and mobility assistance.

In summary, a slewing ring is a specialized bearing that enables controlled rotational movement between components in mechanical systems. Its ability to support various loads, provide smooth rotation, and accommodate different applications makes it a valuable component in a wide range of industries.

How do slewing rings contribute to the adaptability and versatility of rotating systems in various settings?

Slewing rings play a crucial role in enhancing the adaptability and versatility of rotating systems across various settings. Here’s a detailed explanation of how slewing rings contribute to the adaptability and versatility of rotating systems:

  • 360-Degree Rotation: Slewing rings enable 360-degree continuous rotation, allowing rotating systems to operate in any direction. This flexibility is especially valuable in applications such as cranes, excavators, and wind turbines, where unrestricted rotation is necessary to perform tasks efficiently and access multiple work zones without repositioning the entire system.
  • Load-Bearing Capacity: Slewing rings are designed to handle significant radial, axial, and moment loads. Their robust construction and large diameter enable them to support heavy equipment and loads, making them suitable for a wide range of applications, including construction machinery, material handling systems, and offshore platforms. The high load-bearing capacity of slewing rings contributes to the adaptability of rotating systems in demanding settings.
  • Compact Design: Slewing rings have a compact and space-saving design compared to alternative mechanisms for rotational movement. This compactness allows for the integration of slewing rings into systems where space is limited, such as compact construction machinery, industrial robots, and medical equipment. The compact design of slewing rings enhances the adaptability of rotating systems in confined or restricted environments.
  • Versatile Mounting Options: Slewing rings offer versatile mounting options, allowing them to be easily integrated into different types of rotating systems. They can be mounted using various methods, including bolted connections, gear or pinion arrangements, or hydraulic or electric drives. This versatility in mounting options enables slewing rings to adapt to the specific requirements and constraints of different applications and settings.
  • Support for Multiple Components: Slewing rings provide support for various components that are essential for rotating systems. For example, they can support booms, arms, or jibs in construction machinery, or act as a base for rotating platforms or turntables in manufacturing or entertainment industries. By providing a stable and reliable foundation, slewing rings enable the integration of multiple components, enhancing the versatility and adaptability of the overall system.
  • Customization and Specialized Designs: Slewing rings can be customized and designed to meet specific application requirements. Manufacturers can tailor slewing rings to accommodate specific load capacities, dimensions, mounting arrangements, sealing systems, or environmental conditions. This customization allows for the adaptation of slewing rings to diverse settings, ensuring optimal performance and functionality.
  • Integration with Control Systems: Slewing rings can be integrated with electronic or computer-controlled components, such as sensors, actuators, and control systems. This integration enables precise control, automation, and synchronization of rotating systems. By incorporating advanced control features, slewing rings can adapt to dynamic operating conditions, optimize performance, and support advanced functionalities, such as coordinated motion, precision positioning, or remote monitoring.

In summary, slewing rings contribute to the adaptability and versatility of rotating systems by enabling 360-degree rotation, providing high load-bearing capacity, offering a compact design, supporting versatile mounting options, accommodating multiple components, allowing customization, and facilitating integration with control systems. These characteristics make slewing rings suitable for a wide range of applications and settings, enhancing the versatility and adaptability of rotating systems in industries such as construction, manufacturing, transportation, renewable energy, and many others.

China factory Internal Gear Slewing Bearing I. 855.25.00. B Slewing Ring Bearing I. 955.25.00. B  China factory Internal Gear Slewing Bearing I. 855.25.00. B Slewing Ring Bearing I. 955.25.00. B
editor by Dream 2024-05-15