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Flange slewing bearings are a specially designed slewing bearing, the main feature of which is that there are flanges on one or both sides of the inner and outer rings, which makes the installation and fixation of the bearings easier and more secure. They are called "machine joints" in various industrial applications because they can simultaneously withstand axial force, radial force and overturning moment, and achieve relative rotational motion.
Installed on both sides of the bearing end face to prevent dust, moisture and other impurities from entering the interior. At the same time, it prevents grease leakage and increases service life. The bearing is equipped with a lubrication hole or a grease nipple for easy regular maintenance. Some models are equipped with pre-filled grease or automatic lubrication device.
Used to evenly separate rolling elements and ensure smooth operation. Common materials include steel, brass or engineered plastics.
Can be steel balls or rollers, placed in the raceway between the inner and outer rings. Enables low-friction rotation while transmitting loads.
Two concentric steel rings, usually with a flange structure on one side. The flange design can be selected between inner ring flange type or outer ring flange type, depending on the installation method. Bolt holes are reserved on the flange for quick installation and fixing.
Precision raceway machining and high-quality rolling elements ensure smooth bearing rotation and lower friction, thereby improving mechanical performance and reducing wear.
In order to achieve a simple drive solution, flange slewing bearings can provide a variety of gear configurations such as no gear, external gear or internal gear to adapt to different transmission requirements.
The raceway of the flange slewing bearing is usually heat treated by induction hardening, with a hardness of HRC55-62, ensuring its effective hardening depth, improving wear resistance and service life. The high stiffness also makes it suitable for occasions that require bearing application stiffness.
Due to the integrated design of the flange, additional bearing seats can be omitted, making the entire structure more compact and possibly reducing the overall weight. This provides great advantages for some mechanical equipment with strict space and weight restrictions.
Flange type slewing bearings usually use balls or rollers as rolling elements and are specially designed and heat treated to withstand various complex combined loads, including axial, radial and overturning moment loads. Some designs, such as four-point contact ball or cross roller, can provide higher load capacity and rigidity.
This is the most significant feature of flanged slewing bearings. The flange is usually located on the outer ring, which can provide a direct mounting surface, simplify the design and installation process of the bearing seat, make axial positioning simple, and help prevent axial movement of the bearing when subjected to thrust loads or strong vibrations.
A flange slewing bearing is a rotational bearing designed with integrated mounting flanges on either the inner ring or outer ring. The flange structure simplifies installation because users can directly bolt the bearing onto equipment without additional bearing housings.
Manufacturers commonly use flange slewing bearings in compact rotating systems that require reliable axial load capacity, tilting moment resistance, and smooth rotation.
Flange slewing bearings provide several practical advantages for industrial equipment manufacturers:
Compact structural design
Easier installation and alignment
Reduced machining requirements for mounting surfaces
Lower overall equipment weight
Stable rotational accuracy
High load-carrying capability
Lower assembly costs
The integrated flange design also helps shorten equipment production cycles.
Many industries use flange slewing bearings in applications that require controlled rotational movement and limited installation space.
Typical applications include:
Packaging machinery
Industrial robots
Medical equipment
Welding positioners
Food processing machines
Solar tracking systems
Automated assembly equipment
Small cranes and lifting devices
Semiconductor manufacturing systems
Engineers often select flange slewing bearings when compactness and installation efficiency are important.
Flange slewing bearings can simultaneously support:
Axial loads
Radial loads
Tilting moment loads
The exact load capacity depends on factors such as bearing diameter, raceway design, rolling element type, and material selection.
For heavy-duty applications, engineers should perform detailed load calculations before selecting a bearing model.
The primary difference lies in the mounting structure.
A standard slewing bearing usually requires separate clamping or mounting structures during installation. A flange slewing bearing integrates flange surfaces directly into the bearing rings, which simplifies assembly and improves installation efficiency.
Flange designs also help reduce equipment complexity in compact systems.
Manufacturers typically produce flange slewing bearings using high-quality alloy steel or bearing steel to ensure durability and fatigue resistance.
Optional material configurations may include:
42CrMo alloy steel
Stainless steel
Surface-hardened raceways
Corrosion-resistant coatings
Different industries may require customized materials depending on humidity, temperature, cleanliness, or chemical exposure conditions.
Most flange slewing bearings are designed for moderate rotational speeds rather than extremely high-speed operation. However, optimized raceway geometry, precision machining, and proper lubrication can improve speed performance.
Applications requiring continuous high-speed rotation should consider:
Friction torque
Heat generation
Lubrication method
Raceway precision
Seal performance
Proper engineering evaluation helps maximize bearing service life.
Modern automation systems increasingly require compact, lightweight, and highly integrated rotational components. Flange slewing bearings help manufacturers reduce equipment size while maintaining structural rigidity and rotational precision.
Their simplified installation structure also improves assembly efficiency and reduces manufacturing costs, making them highly suitable for next-generation intelligent machinery systems.
The operational lifespan depends on multiple variables, including:
Load conditions
Operating speed
Lubrication quality
Environmental contamination
Installation accuracy
Maintenance frequency
Under proper operating conditions, high-quality flange slewing bearings can achieve long service intervals with stable rotational performance.
Yes. Many manufacturers provide customized flange slewing bearing solutions for specialized industrial applications.
Customization options may include:
Non-standard dimensions
Internal or external gear designs
Special sealing systems
Lightweight structures
Corrosion-resistant materials
Precision preload configurations
High-temperature designs
Custom bearings help equipment manufacturers optimize overall machine performance.
