Slewing Bearing Knowledge - LDB

How to Choose the Right Slewing Bearing for Construction Equipment Applications

July 22, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Slewing Bearing?

A slewing bearing is a precision-engineered mechanical component that facilitates rotational movement between two structures. It supports axial, radial, and moment loads, and is commonly used in construction equipment such as cranes, excavators, concrete pumps, and aerial work platforms. These large-diameter bearings are critical for heavy-duty turning applications, enabling machines to rotate smoothly while managing intense loads and environmental stress.

Choosing the right slewing bearing is not just a matter of size—it requires a thorough understanding of application needs, load dynamics, environmental conditions, and product lifespan. In this article, we’ll walk you through a complete guide to selecting the best slewing bearing for construction machinery.

Key Factors When Selecting Slewing Bearings

Load Type and Magnitude

Understand whether your machine is exposed to:

Axial loads (vertical weight)

Radial loads (horizontal stress)

Overturning moment (torque from off-center loads)

For instance:

Excavators require strong moment load resistance

Tower cranes need high axial load-bearing capacity

Drilling rigs must handle both high torque and axial thrust

Use accurate force analysis or simulation data (like FEA) to determine expected load ranges.

Rotation Speed and Duty Cycle

Aerial platforms with slow, infrequent rotation require different bearings than high-speed drilling rigs or tunnel boring machines. Choose:

Ball slewing bearings for low-speed, low-friction applications

Roller slewing bearings for high-load or rotational inertia

Installation Space and Mounting Type

Assess diameter, bolt hole placement, and flange structure:

Internal gear bearings save external space

External gear allows better torque transmission

Non-gear options exist for systems using external drives

Recommended Slewing Bearing Types for Construction Equipment

Four Point Contact Ball Slewing Bearing

Excellent for cranes and work platforms

Handles combined loads efficiently

Compact and cost-effective

Double Row Ball Slewing Bearing

Supports higher axial and radial loads

Used in heavy-duty crawler cranes and drilling machines

Higher stability due to dual-row configuration

Cross Roller Slewing Bearing

High stiffness and precision

Ideal for tight installation spaces

Preferred in high-torque applications like foundation machines

Three-Row Roller Slewing Bearing

Superior load handling in all directions

Large size, heavy-duty

Suitable for bucket wheel excavators and heavy mining cranes

Environmental Considerations

Construction equipment faces harsh field conditions:

Dust and sand (grit contamination risk)

Mud and water (requires IP-rated sealing)

Temperature extremes (from -30°C to +70°C)

LDB slewing bearings are available with:

Triple lip seals

Grease ports for regular lubrication

Chrome-plated raceways for corrosion resistance

Customization and Mounting Options

Some machines require non-standard mounting holes or flange connections. LDB offers:

Custom bolt hole patterns

Split bearings for large-diameter applications

Optimized raceway geometry

Reinforced gear tooth hardening for longer service life

Typical Price Range and Procurement Tips

The price of slewing bearings for construction depends on:

Outer diameter and gear type (internal/external/no gear)

Load class and material grade

Sealing systems and certification (CE, ISO, etc.)

Typical Price Range: USD $400 – $6,000 per unit
Custom-engineered options may cost more depending on complexity and volumes.

To find a reliable manufacturer or supplier, consult technical teams and request:

2D/3D drawings

Load rating documentation

Lifetime fatigue calculation

Visit www.ldb-bearing.com for quotes and technical assistance.

Why LDB Is a Trusted Partner in the Construction Industry

LDB is a globally recognized manufacturer and supplier of slewing bearings for heavy-duty construction applications. With:

20+ years of experience

Advanced CNC production lines

Custom machining for OEM partners

Robust inventory and fast shipping options

LDB supports clients from design to delivery. Our products are used in:

Mobile and tower cranes

Tracked excavators

Earth drills and piling rigs

Material handling booms

Final Advice: Ask the Right Questions

Before placing an order, ask:

What’s the actual working load and peak load?

What’s the expected rotational speed and duty cycle?

Is environmental protection a priority?

Are maintenance intervals important?

Choosing the wrong bearing can lead to frequent breakdowns or costly repairs. LDB ensures that your slewing bearing delivers reliable, long-term performance no matter how tough the construction site.

For application-matched solutions, contact us at www.ldb-bearing.com.

Flanged Slewing Bearings: When and Why to Use Them in Compact Rotating Applications

July 22, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Flanged Slewing Bearing?

A flanged slewing bearing is a specialized type of slewing ring that integrates a flange—usually on either the inner or outer ring—into its design. The flange serves as a built-in mounting surface, allowing for simplified installation without additional mounting plates or housing structures. These bearings retain the core function of supporting axial, radial, and moment loads while offering improved alignment and space-saving benefits.

Flanged slewing bearings are especially popular in applications requiring compact structures, lightweight systems, and easy mounting. From robotics to aerial platforms, these precision components offer mechanical versatility and operational convenience.

Structural Advantages of Flanged Slewing Bearings

Flanged slewing bearings can be manufactured in multiple configurations:

Flange on Outer Ring: Easier to mount to static structures

Flange on Inner Ring: Preferred for rotating components

Dual-Flanged Design: Offers higher rigidity and symmetrical support

These bearings can be:

Gearless

Internally geared

Externally geared

Why Choose a Flanged Slewing Bearing?

Flanged slewing bearings are ideal when you need:

Compact Design

The integrated flange reduces the need for additional mounting components, saving space and weight.

Simplified Installation

No welding or complex housing required—just bolt-on mounting to existing structures.

High Positional Accuracy

Improved alignment and rigidity make them suitable for indexing or positioning tables.

Cost-Efficiency

Less fabrication required for housings or base structures translates into reduced system costs.

LDB Flanged Slewing Bearing Solutions

As a global manufacturer and supplier, LDB offers a wide range of high-quality flanged slewing bearings under its LDB-FL Series, designed to fit various industrial, automation, and energy applications.

Key Features of LDB-FL Series:

Outer Diameter Range: 200mm – 1600mm

Gear Types: External, Internal, or None

Bolt Hole Pattern: Customizable

Flange Position: Inner or Outer Ring

Materials: 50Mn or 42CrMo with raceway hardening

Sealing: Labyrinth or contact seals available

Customization Support:

CAD drawings with bolt alignment

Surface treatment options (phosphate, zinc, chrome)

Special lubricant or food-grade grease

Common Applications

Application Type	Why Flanged Bearings Fit
Industrial Robotics	Precise alignment in base joints
Medical Equipment	Compact and lightweight movement
Solar Trackers	Streamlined structural connection
Aerial Work Platforms	Light weight, easy serviceability
Stage & Lighting Systems	Simple rotation mechanism
Food & Beverage Machines	Sanitary, sealed construction

Installation Tips

Ensure bolt torque follows manufacturer specs to avoid deformation

Clean flange surface before assembly for best alignment

Use alignment pins in high-precision applications

Recheck gear mesh and preload after initial installation

Flanged Bearing vs Standard Slewing Bearing

Feature	Flanged Bearing	Standard Slewing Bearing
Installation	Bolt-on, direct mounting	Requires external mounting ring or plate
Weight	Lighter overall	Heavier, depending on housing
Assembly Time	Faster	Requires more setup
Common Applications	Compact/lightweight design	Heavy machinery, cranes

Typical Price Range and Specifications

The price of flanged slewing bearings depends on size, flange location, and load rating. LDB offers competitive factory-direct pricing with customization support.

Size (Outer Diameter)	Price Range (USD)	Gear Option
200–600 mm	$180 – $600	Gearless or internal
600–1000 mm	$600 – $1200	External gear
1000–1600 mm	$1200 – $2500+	Custom gear profile

Supplier Note: LDB supports OEM orders, bulk purchasing discounts, and just-in-time shipping for industrial assembly lines.

Why Choose LDB as Your Manufacturer and Supplier?

Precision Manufacturing: Advanced CNC machining ensures concentricity and raceway accuracy

Material Quality: All raceways hardened to HRC 55–62

Flexible Engineering: Tailored flange size, gear ratio, and hole placement

Global Delivery: Fast shipping from China to Europe, North America, and Southeast Asia

Support Services: Drawing consultation, installation guidance, technical training

As both manufacturer and supplier, LDB delivers high-value flanged slewing bearings with reliability and responsiveness.

Conclusion

If your project requires compactness, fast installation, and precision rotation, flanged slewing bearings are the right fit. With LDB’s engineering support and high-performance product line, integrating these bearings into your machine architecture becomes simple and efficient.

Ready to get started? Contact LDB today to explore our flanged bearing catalog or request a customized quote.

Flanged Slewing Bearings: The Space-Saving Solution for Modern Machinery Designs

What Is a Flanged Slewing Bearing?

A flanged slewing bearing is a variant of traditional slewing rings that features a flange structure on either the inner or outer ring. This design enables more convenient installation by eliminating the need for a separate mounting plate or housing support.

Compact, lightweight, and easy to align, flanged slewing bearings are ideal for applications with space constraints or strict mounting precision requirements. They are commonly used in packaging equipment, robotic arms, small cranes, rotating displays, and automated guided vehicles (AGVs).

Key Advantages of Flanged Slewing Bearings

Simplified Installation

Flanged designs allow for direct bolt-on mounting to a surface or housing. This reduces the need for support rings, minimizes alignment error, and shortens assembly time.

Reduced Structural Footprint

With fewer components and a unified load-bearing surface, flanged slewing bearings contribute to overall space savings. This is critical in compact systems like AGVs, medical imaging tables, and miniaturized automation lines.

Integrated Load Handling

Despite their slim form, flanged slewing bearings support:

Axial loads (vertical pressure)

Radial loads (horizontal forces)

Tilting moments (overturning torque)

Depending on raceway and ball arrangement, they can deliver precise, high-stiffness rotation under demanding conditions.

Cost-Efficient Engineering

Reduced components mean lower material and labor costs. Maintenance is simpler and access is easier, making flanged designs more budget-friendly over the long term.

Application Scenarios for Flanged Slewing Bearings

Industry	Use Case
Robotics	End-of-arm tooling, base rotation joints
Packaging Machinery	Rotary cutters, feeders, labelers
Medical Devices	CT scanners, X-ray table pivots
AGVs & Mobile Robots	360° sensor platforms, turret mechanisms
Aerospace Equipment	Lightweight satellite tracking antennas
Display & Exhibitions	Rotating product stages and podiums

LDB Flanged Slewing Bearings: Precision Meets Performance

LDB, a leading global manufacturer and trusted supplier, offers a wide portfolio of flanged slewing bearings with precision-grade performance. Our range includes:

External Flange Bearings: Flange on outer ring for interior mount

Internal Flange Bearings: Flange on inner ring for external mount

Gearless or Geared Options: External, internal, or non-geared as needed

Custom Drilling Patterns: To fit OEM platforms perfectly

Product Highlights:

Outer diameters from 200 mm to 1500 mm

Standard and custom gear modules

Slim profile with deep groove or four-point contact ball structure

Hardness-tested gear teeth and raceways

Optional rust-proof coatings and dust seals

Selecting the Right Flanged Slewing Bearing

Consider These Parameters:

Load type: static or dynamic

Rotation speed and duty cycle

Mounting surface flatness

Gear interface (motor, servo, or direct drive)

Environmental exposure: moisture, dust, chemicals

LDB engineers provide 1-on-1 support to help customers select models based on technical drawings, FEA simulations, or prototype testing.

Typical Price Range & Procurement Insights

The price of flanged slewing bearings is affected by:

Flange placement and drilling complexity

Diameter and thickness of raceways

Gear requirements

Surface treatment (e.g., phosphate, chromate)

Typical Price Range: USD $150 – $2,000 per unit (Custom flanged types may exceed depending on volume and spec.)

LDB’s global supplier network ensures fast delivery and localized support for high-volume and prototype orders alike. Visit www.ldb-bearing.com to learn more.

Why LDB Is the Preferred Flanged Slewing Bearing Partner

ISO-certified manufacturing with strict quality controls

Fast lead times for standard SKUs

CAD-ready models for OEM design integration

In-house customization from design to delivery

Full-service support: engineering, logistics, and after-sales

We supply top-tier flanged slewing bearings to clients across automation, aerospace, defense, healthcare, and logistics.

Final Thoughts

Flanged slewing bearings strike a perfect balance between space efficiency and structural strength. Their integrated mounting capability and streamlined profile help modern engineers build more compact, precise, and cost-effective systems.

As industries demand more from less, LDB delivers. Our flanged slewing bearings offer the performance and practicality needed to power modern innovation.

Looking for a custom solution or need help selecting a part? Contact LDB at www.ldb-bearing.com for personalized support.

Flanged Slewing Bearings: Compact Power for Streamlined Engineering

July 21, 2025/in Slewing Bearing Knowledge /by ldbadmin

What is a Flanged Slewing Bearing?

A Flanged Slewing Bearing is a specialized type of slewing ring designed with an integrated flange along either the inner or outer ring. This flanged design simplifies mounting, reduces weight, and enables integration into systems with tight spatial constraints. Unlike traditional slewing bearings that often require external mounting plates or supports, flanged bearings can be directly bolted to adjoining structures, improving installation efficiency.

Flanged slewing bearings are widely used in applications such as robotics, automation systems, lifting platforms, and small construction equipment—especially where compact design, lightweight assembly, and rapid installation are critical.

Structural Benefits

Integrated Flange Design
The flanged profile eliminates the need for separate mounting flanges or adapter rings, reducing system complexity.

Space and Weight Efficiency
Ideal for applications with compact mechanical envelopes. By reducing material bulk, flanged bearings help engineers save both space and weight.

Easy Mounting
The flange provides a straightforward, bolt-on solution that simplifies installation, maintenance, and replacement operations.

Reliable Load Handling
Despite their compact size, flanged bearings still maintain the ability to handle combined axial, radial, and moment loads.

Gear and Non-Gear Options
Available with internal gears, external gears, or no gear, depending on the torque transmission needs of the system.

Common Applications

Robotic Arms and Automated Equipment: For fast, accurate rotational motion in confined workspaces.

Turntables and Rotating Displays: Providing quiet and stable movement in commercial kiosks and stage equipment.

Aerial Lifts and Small Cranes: Ensuring safe rotation with minimum structural overhead.

Medical Devices: In diagnostic and surgical equipment where quiet and smooth rotation is vital.

Vehicle-Mounted Systems: Where low weight and vibration resistance are important.

LDB’s Flanged Slewing Bearing Lineup

LDB Bearing offers a full series of flanged slewing bearings tailored for space-sensitive industrial applications. All units are manufactured with premium 42CrMo or 50Mn steel, precision-ground raceways, and GCr15 steel rolling elements.

Technical Highlights:

Outer Diameter Range: 200 mm to 3000 mm

Flange Types: Inner flange, outer flange, dual flange on request

Sealing: Labyrinth and rubber seals for dust and moisture protection

Lubrication: Factory-greased and optionally fitted with lube nipples

Customization: Bolt patterns, gear modules, and preload tuning available

LDB also supports non-standard designs for integration into automated guided vehicles (AGVs), camera systems, or specialized industrial robots.

Pricing, Supplier, and Manufacturer Insights

As a seasoned manufacturer and global supplier, LDB has developed deep expertise in precision bearing design, serving clients across more than 50 countries.

Price Determinants:

Outer diameter and flange thickness

Gear type and tooth accuracy

Application-specific modifications

Surface coatings and mounting hole patterns

Typical Price Range: USD $150 to $2500 per unit depending on size, material, and gear configuration.

LDB provides full technical support from pre-sales consultation to post-installation diagnostics. Customers can request quotes, catalogs, and product models via LDB’s official platform.

Why Choose LDB for Flanged Slewing Bearings?

Fast prototyping and short lead times

CAD-integrated design support

ISO-certified production and strict QA process

Lightweight, durable bearings trusted by OEMs worldwide

Full-service support including application simulation and load analysis

LDB’s flanged slewing bearings have already been successfully implemented in medical automation, compact lifting platforms, and aerospace ground support systems.

Conclusion

Flanged Slewing Bearings strike the perfect balance between strength and simplicity. Their bolt-on versatility and compact form make them the preferred choice for engineers designing space-sensitive rotational systems. With LDB as your supplier and manufacturer, you gain the benefit of precision, scalability, and long-term reliability in a world-class product.

Double the Power: Understanding Double Row Ball Slewing Bearings

July 21, 2025/in Slewing Bearing Knowledge /by ldbadmin

What is a Double Row Ball Slewing Bearing?

A Double Row Ball Slewing Bearing is a rotational rolling-element bearing with two rows of steel balls that contact the raceways at varying angles. Compared to single-row designs, double row slewing bearings offer higher axial and radial load capacity and are especially suited for applications requiring robust and stable support under heavy-duty operations.

This bearing type is widely used in construction equipment, port machinery, and wind power systems where high load demands, space efficiency, and long service life are essential.

Structural Advantages

Enhanced Load Distribution
Two rows of balls provide more contact points, distributing loads more evenly across the raceways and improving bearing rigidity and rotational accuracy.

Increased Axial and Radial Load Capacity
Double row ball designs can handle higher axial and tilting moment loads than four-point contact bearings, making them ideal for large cranes, rotary drills, and offshore platforms.

Vibration and Shock Resistance
The enhanced structure improves resistance to external shock and vibrations, ensuring operational safety in harsh environments.

Gear Customization
LDB provides these bearings with internal gear, external gear, or gearless designs to fit specific application needs.

Common Applications

Truck Cranes and Tower Cranes: Supporting large, rotating superstructures under dynamic loading conditions.

Harbor and Container Machinery: Handling high-speed, high-frequency operations.

Large Excavators and Rotary Drilling Rigs: Providing stable rotation for precision digging and drilling.

Wind Power Equipment: Used in yaw and pitch systems to support nacelle rotation.

LDB’s Double Row Ball Slewing Bearing Highlights

LDB Bearing manufactures its double row ball slewing bearings with high-grade materials like 42CrMo for rings and GCr15 for balls. All raceways are precision-ground, and surface hardening ensures durability under extreme loads.

Technical Parameters:

Outer Diameter Range: 500 mm to 6000 mm

Ball Row Configurations: Equal diameter or stepped ball rows for customized force management

Sealing: Labyrinth and contact seals for dust and water ingress protection

Lubrication: Factory-lubricated with optional automatic greasing systems

LDB also supports customer-specific bolt hole layouts, custom sealing systems, and integrated gear teeth hardening.

Pricing, Supplier, and Manufacturer Information

LDB Bearing is a leading manufacturer and supplier of high-load slewing rings, including double row ball slewing bearings, with over 20 years of experience. Located in Luoyang, China, LDB supplies to more than 50 countries across construction, energy, and port logistics industries.

Price Factors Include:

Outer diameter and thickness

Gear type and material selection

Surface coating and sealing configuration

Custom options and volume

Typical price ranges from USD 800 to USD 5000 depending on the specification. Clients can request quotations and CAD drawings directly via LDB’s website.

Why Choose LDB?

In-house manufacturing and heat treatment

Fast production cycles and global shipping

ISO 9001-certified QA system

Responsive pre- and post-sales engineering support

Whether you’re integrating slewing bearings into a crane, drill rig, or wind turbine, LDB’s double row ball slewing bearings provide the performance and reliability required for continuous operation.

Conclusion

Double Row Ball Slewing Bearings represent a perfect combination of strength, flexibility, and durability. With LDB’s engineering expertise and proven quality, your machinery can reach new heights of stability and load capacity. Choose LDB for world-class slewing solutions built to last.

Double Row Ball Slewing Bearings: Dual Performance for Heavy-Duty Precision Applications

July 21, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Double Row Ball Slewing Bearing?

A double row ball slewing bearing is a large-diameter rotational bearing that contains two rows of steel balls arranged in staggered or parallel configurations. These bearings are designed to simultaneously support axial, radial, and moment loads with enhanced stability and durability, making them ideal for large industrial machinery and heavy-equipment applications.

Unlike single-row slewing rings, the double-row design increases load-bearing capacity, improves torque resistance, and ensures smoother rotational behavior under dynamic and static forces.

Why Choose a Double Row Ball Slewing Bearing?

Increased Load Capacity

With two raceways and more rolling elements, double-row designs can handle up to twice the load of standard single-row bearings, especially in crane booms, excavators, and drilling rigs.

Improved Rotational Stability

The additional row of balls provides better resistance to tilting moments and ensures more even distribution of forces along the raceway, minimizing deflection.

Versatile Gear Configurations

These bearings are available with:

External gear teeth

Internal gear teeth

Non-geared (for separate drive systems)

Gear modules can be tailored to match the application’s torque and speed requirements.

Lower Maintenance Costs

Longer service life and reduced stress per ball lead to fewer replacements and less downtime.

Common Application Scenarios

Industry	Application
Construction	Excavators, mobile cranes, piling rigs
Marine Engineering	Deck cranes, offshore hoisting systems
Wind Energy	Yaw drives in onshore wind turbines
Tunneling Equipment	TBMs, rotating platforms
Forestry & Logging	Heavy-duty loaders, cutters

LDB Double Row Slewing Bearing Lineup

As a globally recognized manufacturer and supplier, LDB offers a full spectrum of double row slewing bearings from 800 mm to 4500 mm in diameter, including:

Parallel ball row configuration for symmetric loads

Different diameter row design for unbalanced loads or compact envelopes

Induction-hardened raceways and gear teeth

Integrated seals for dusty or corrosive environments

Custom bolt hole patterns and flange connections

Key Specs:

Axial load rating: Up to 6000 kN

Moment load: Up to 1000 kNm

Rotation speed: ≤ 1 rpm (typical for heavy-duty use)

Gear module: M5 – M20 (custom available)

Typical Price Range & Procurement Tips

Factors that affect price:

Gear configuration (external/internal/none)

Precision and hardness requirements

Quantity of units and project timeline

Certifications required (e.g., CCS, DNV, CE)

Typical Price Range: USD $1,200 – $12,000 per unit
Request a quote and 2D/3D CAD files at www.ldb-bearing.com.

Engineering and Support Services from LDB

LDB offers:

Bearing simulation and lifetime calculation reports

OEM interface consultation for cranes and excavators

Fast prototyping and batch delivery for heavy industry clients

Custom lubrication systems and sealing designs

All products undergo full dimensional inspection, gear mesh analysis, and torque verification before shipment.

Why LDB Is a Trusted Partner

20+ years in slewing bearing manufacturing

Exported to over 50 countries across 5 continents

In-house forging, heat treatment, CNC machining

Proven performance in construction, energy, and defense sectors

On-time delivery and technical training available globally

Installation & Maintenance Advice

Mount on a flat, rigid surface to avoid raceway deformation

Use calibrated torque wrenches for bolt tightening

Apply thread locking compound to prevent loosening

Re-grease periodically based on load and rotation frequency

Conclusion

Double row ball slewing bearings provide the extra strength and rotational consistency needed in demanding environments. Whether you’re lifting, rotating, or supporting multi-ton structures, their robust construction and dual-row advantage make them a smart investment.

LDB’s engineering-driven manufacturing and application expertise help clients reduce lifecycle costs and boost machinery performance. Choose LDB for safe, strong, and stable solutions.

Get in touch today at www.ldb-bearing.com to learn more.

Cross Roller Slewing Bearings: Precision Rotation for High-Stiffness Applications

July 21, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Is a Cross Roller Slewing Bearing?

A cross roller slewing bearing is a type of precision rotational bearing that features cylindrical rollers arranged alternately in perpendicular (90-degree) orientations between two raceways. This crossed arrangement allows the bearing to simultaneously handle axial, radial, and moment loads while maintaining high rigidity and minimal rotational clearance.

Because of their compact structure and high rotational accuracy, cross roller slewing bearings are widely used in equipment where both precision and load-bearing capacity are critical. This includes medical imaging systems, industrial robots, radar antennas, and machine tools.

Unique Benefits of Cross Roller Slewing Bearings

High Rigidity in a Compact Form

The orthogonal roller arrangement offers significantly higher stiffness compared to ball slewing bearings, even in small spaces. This allows for precise control of rotation under load.

Accurate Positioning

Thanks to their low friction and backlash, cross roller slewing bearings provide smooth, accurate rotation—making them ideal for devices requiring high repeatability.

Combined Load Support

These bearings efficiently manage axial, radial, and tilting moment loads at the same time, reducing the need for multiple bearing sets or complex assemblies.

Space Optimization

The compact design minimizes thickness and simplifies integration in tight enclosures—critical for surgical robots or semiconductor processing machines.

Where Are Cross Roller Slewing Bearings Used?

Industry	Use Case
Medical Equipment	CT and MRI gantry rotation, surgical robots
Robotics	Joint rotation, base turntables
Aerospace	Satellite antenna positioning systems
Optical Systems	Precision lenses and telescope tracking
CNC & Machine Tools	Rotary tables, indexing systems
Military Systems	Radar dishes, missile launcher bases

LDB’s Cross Roller Slewing Bearing Solutions

As a long-standing manufacturer and global supplier, LDB offers cross roller slewing bearings engineered for high-performance applications. Our portfolio includes:

Standard cross roller slewing bearings with outer diameters from 200mm to 1500mm

Geared and non-geared configurations (internal, external, or gearless)

Split-type designs for easy maintenance in compact structures

Preloaded systems for zero-backlash motion

Stainless steel options for cleanroom and medical use

Design Highlights:

Integrated sealing rings

Ultra-smooth raceway grinding

Precision heat-treated rollers

Dual-row or tapered cross roller configurations for added capacity

LDB’s cross roller series is trusted by clients in Japan, Germany, and the US for applications where failure is not an option.

Pricing and Procurement Considerations

Price factors include:

Diameter and load rating

Gear module and accuracy grade

Coating (e.g., phosphate, black oxide, nickel-plated)

Customization of bolt holes or preload

Typical Price Range: USD $500 – $5,000 per unit (High-precision or large-diameter types may vary above this range.)

When selecting a cross roller slewing bearing, consult your manufacturer or supplier for 3D models, load-life calculations, and installation drawings.

Request your quote today via www.ldb-bearing.com.

Installation Tips

Ensure flatness and parallelism of the mounting surface

Do not apply force directly on the bearing face during installation

Use torque-controlled tightening on bolts

Apply uniform preload where applicable

Lubricate thoroughly before first use and follow re-greasing intervals

Why Choose LDB for High-Precision Bearings?

20+ years of bearing production excellence

In-house design and manufacturing for special orders

Strict quality control with full traceability

ISO 9001, CE, and medical device component certifications

Rapid response on RFQs and technical consultations

LDB’s cross roller slewing bearings meet the world’s most demanding requirements—from operating rooms to orbital satellites.

Final Thoughts

When accuracy and reliability are non-negotiable, cross roller slewing bearings are the solution. Their ability to combine precision, strength, and compact form makes them indispensable in today’s high-tech machinery.

LDB brings decades of experience and a global network to support your project from design through delivery. Let us help you build smoother, stronger, smarter motion systems.

Explore our product range or request support at www.ldb-bearing.com.

Cross Roller Slewing Bearings: High-Precision Rotation with Maximum Rigidity

July 21, 2025/in Slewing Bearing Knowledge /by ldbadmin

What is a Cross Roller Slewing Bearing?

A Cross Roller Slewing Bearing is a type of rotational bearing where cylindrical rollers are alternately arranged at 90° to each other between inner and outer rings. Unlike traditional ball bearings, the cross-roller configuration enables ultra-high stiffness, smooth motion, and precise load management in both axial and radial directions—plus tilting moments. This makes them especially suitable for applications that require compact size, minimal backlash, and excellent positioning accuracy.

Cross roller slewing bearings are often used in robotics, precision turntables, radar systems, and aerospace testing equipment.

Structural Advantages

Crossed Roller Design
The alternating 90° roller orientation allows the bearing to support loads in every direction—axial, radial, and moment—simultaneously.

High Rigidity and Minimal Deformation
Roller line contact ensures load is spread evenly across raceways, minimizing elastic deformation and enhancing operational precision.

Compact Profile with High Load Capacity
Despite its slim cross-section, this bearing type achieves exceptional stiffness and load-bearing capability.

Precision Rotation
Cross roller bearings maintain minimal runout and backlash, which is critical for automated machinery and motion control systems.

Multiple Mounting Options
Available with internal gear, external gear, or gearless configurations, as well as flanged and split-ring designs.

Application Scenarios

Industrial Robots and Welding Arms: For smooth, backlash-free movement in articulated joints.

Machine Tool Rotating Tables: Ensuring high positioning accuracy during complex machining.

Medical Equipment: In surgical robots and imaging systems where vibration-free motion is essential.

Aerospace Test Platforms: For structural and vibration analysis systems with high stability needs.

Radar and Satellite Dishes: Enabling stable tracking in precision positioning applications.

LDB’s Cross Roller Slewing Bearings

As a premium slewing bearing manufacturer, LDB designs and produces high-performance cross roller slewing bearings using ultra-precise machining, induction hardening, and roller preloading processes.

Key Technical Features:

Outer Diameter Range: 200 mm – 3500 mm

Roller Material: GCr15 precision-ground cylindrical rollers

Raceway Material: Forged and hardened 42CrMo or 50Mn

Sealing System: Contact and labyrinth seals for indoor/outdoor use

Lubrication: Pre-filled with grease, with optional oiling ports

LDB also offers preload customization, non-standard geometries, and hybrid ceramic roller solutions for demanding environments.

Pricing, Supplier, and Manufacturer Information

LDB is a globally trusted supplier and manufacturer of cross roller slewing bearings. Our products are backed by ISO 9001 certification, advanced testing, and rapid global logistics.

Pricing Influencers:

Roller diameter and quantity

Bearing size and gear configuration

Precision class and preload settings

Custom coating and corrosion protection options

Typical Price Range: USD $250 to $3500 depending on specifications.

Engineers and procurement teams can request 2D/3D CAD models, pricing, and engineering advice through www.ldb-bearing.com.

Why Choose LDB Cross Roller Bearings?

Extreme stiffness for zero-backlash systems

High-speed rotary performance

Custom load direction optimization

Fast prototyping and small-batch production for R&D

Extensive deployment in precision and robotic industries

LDB’s cross roller bearings are field-proven in medical imaging systems, semiconductor positioning, robotic actuators, and satellite tracking mechanisms.

Conclusion

Cross Roller Slewing Bearings are the go-to choice for engineers who need ultimate accuracy, strength, and compactness. LDB delivers precision-engineered solutions that empower smart machines and critical infrastructure. For those seeking a proven supplier and precision manufacturer, LDB ensures every degree of rotation counts.

Choosing Between Single Row and Double Row Ball Slewing Bearings: A Practical Guide

July 18, 2025/in Slewing Bearing Knowledge /by ldbadmin

What Are Single and Double Row Ball Slewing Bearings?

A slewing bearing is a specialized mechanical component designed to support heavy radial, axial, and moment loads while allowing smooth rotational movement. Slewing bearings are essential in construction equipment, renewable energy systems, and industrial automation.

Among the most common types are:

Single row four-point contact ball bearings, featuring one row of balls capable of handling axial and radial forces in both directions and overturning moments.

Double row ball slewing bearings, which incorporate two independent ball circuits to increase load capacity and improve stability.

Knowing when to choose a single or double row bearing is crucial to system performance, safety, and cost-effectiveness.

Single Row vs. Double Row Slewing Bearings: Design Overview

Feature	Single Row Four-Point Contact	Double Row Ball
Ball Circuits	One	Two (typically with different diameters)
Load Capacity	Moderate	High (especially axial loads)
Outer Dimensions	Compact	Larger and heavier
Complexity	Simple design	More complex and costlier
Friction and Speed	Lower friction, higher speed	Higher resistance, slower operation
Common Applications	Cranes, turntables, robotics	Tower cranes, wind turbines, heavy loaders

When to Choose a Single Row Slewing Bearing

Single row bearings are best suited for applications requiring:

Lower space consumption

Medium-duty performance

Higher rotational speed

Simpler installation and lower cost

LDB’s Recommended Product:
LDB-FQ Series – Four Point Contact Ball Slewing Bearing

Available in internal or external gear, or gearless versions

Outer diameter: 300mm–4500mm

Optimized for construction, loading equipment, and light rotary tables

When to Choose a Double Row Ball Slewing Bearing

Double row ball slewing bearings are preferred when:

The application requires higher axial and radial load capacity

The structure demands superior stability and torque support

Overturning moments are significant

LDB’s Recommended Product:
LDB-DB Series – Double Row Ball Slewing Bearing

Dual track design, with symmetric or asymmetric ball diameters

Customizable bolt hole patterns

Ideal for tower cranes, port machinery, and aerial work platforms

Application-Based Decision Making

Application	Recommended Bearing Type
Excavators and Small Cranes	Single Row
Wind Turbine Yaw Bearings	Double Row
Robotics Turntables	Single Row
Port and Ship Cranes	Double Row
Compact Machinery	Single Row
High-load Civil Engineering	Double Row

Load and Performance Comparison

Load Capacity
Double row bearings can support 30–50% more load compared to their single row counterparts of similar size, due to increased ball contact and distribution.

Moment Resistance
Double row designs offer superior resistance to tilting and torsional stress, ideal for applications involving significant moment loading.

Rotational Speed
Single row slewing bearings generally provide higher speed performance due to reduced friction.

LDB’s Slewing Bearing Engineering Advantages

As a global manufacturer and supplier, LDB offers a wide range of both single and double row slewing bearings with:

In-house gear heat treatment and grinding

Anti-rust coatings and sealing options

3D CAD drawings and simulation support

OEM customization (gear modules, hole patterns, clearance class)

All LDB slewing bearings undergo:

100% raceway hardening testing

Noise and clearance inspection

Serial number traceability

Optional CE/SGS/ISO certification

Price Comparison Guide

The price of a slewing bearing depends on diameter, structure, gear type, and load requirements.

Type	Typical Diameter Range	Price Estimate (USD)
Single Row (LDB-FQ Series)	400mm–2000mm	$150 – $800
Double Row (LDB-DB Series)	800mm–3000mm	$500 – $2000+

Bulk orders, OEM customization, and expedited delivery are available from LDB at competitive factory-direct pricing.

Why Choose LDB for Slewing Bearings?

20+ years of industry experience

Global export to 60+ countries

Full engineering and after-sales support

OEM manufacturing for major crane and turbine manufacturers

Fast prototyping and 3–4 week lead times for custom models

As both a manufacturer and supplier, LDB ensures quality, availability, and cost-efficiency.

Conclusion

Whether you need a compact and cost-effective rotary bearing or a high-capacity load-bearing solution, understanding the key differences between single and double row slewing bearings is essential.

LDB helps you make informed decisions with reliable products, tailored engineering, and end-to-end service. Contact us today to get expert guidance and pricing for your next slewing bearing application.

Balancing Power and Flexibility: Exploring Double Row Different Diameter Ball Slewing Bearings

July 18, 2025/in Slewing Bearing Knowledge /by ldbadmin

What is a Double Row Different Diameter Ball Slewing Bearing?

A Double Row Different Diameter Ball Slewing Bearing is a unique structural design within the slewing ring family. It features two rows of balls of unequal diameter positioned at different radii. This special configuration allows for enhanced load distribution, combining the load advantages of different ball sizes in a compact, high-performance bearing system.

This type of slewing bearing excels in applications that require simultaneous handling of high axial loads, moderate radial loads, and significant tilting moments—especially in machines where installation space is constrained.

Structural Advantages

Dual-Diameter Ball Rows
By employing balls of different diameters, the load distribution is optimized for both axial and tilting moment resistance. The larger row handles heavy axial loads, while the smaller row offers increased contact points for balance and rotational precision.

Optimized Raceway Angles
Each raceway is engineered with different contact angles to maximize performance under complex force combinations, delivering stability without sacrificing flexibility.

Compact and Lightweight Design
Despite its dual-row structure, this bearing remains compact due to its tight axial dimensions, making it ideal for mobile equipment.

Custom Gear Integration
Available with internal gear, external gear, or non-gear options, it can be adapted to the torque transmission and installation needs of different industries.

Application Scenarios

Mobile Cranes and Truck-Mounted Equipment: High axial load and dynamic shock absorption in compact designs.

Material Handling Systems: For rotating conveyors or transfer tables requiring reliable and continuous rotation.

Wind Turbine Yaw Systems: Long-lasting performance in controlling the direction of rotor alignment.

Large Rotary Platforms and Turntables: Especially useful in equipment that rotates large payloads over time.

Railway Maintenance Machines: Where vibration resistance and low-profile installation are key.

LDB’s Double Row Different Diameter Ball Slewing Bearings

LDB offers a wide range of these specialty bearings for custom and OEM applications. Manufactured in Luoyang, China, with more than 20 years of industry experience, LDB has perfected the metallurgy, precision, and gear shaping needed for demanding installations.

Technical Specifications:

Outer Diameter Range: 500 mm to 6000 mm

Ball Material: GCr15 high-carbon chromium steel

Raceway Material: Forged 42CrMo or 50Mn steel

Seals: Dual rubber sealing for IP54–IP65 protection

Lubrication: Optional centralized lubrication ports

LDB’s products also include induction-hardened gear teeth, precision-ground raceways, and customizable hole patterns to ensure seamless integration into client systems.

Pricing, Supplier, and Manufacturer Insights

As a world-class manufacturer and supplier, LDB delivers tailored solutions across sectors such as construction, mining, energy, and automation.

Price Factors Include:

Bearing diameter and ball diameter ratio

Gear configuration (internal/external/no gear)

Custom hole patterns and surface treatments

Operating temperature and environmental sealing requirements

Typical Price Range: USD $900 to $6000 depending on design complexity, gear type, and application load requirements.

LDB provides instant supplier support through CAD files, load calculations, and global logistics. Clients can request a free consultation and quote through LDB’s official site.

Why Engineers Trust LDB

Full vertical integration: in-house heat treatment, gear cutting, and assembly

Strict QA with dynamic simulation testing

Over 2000 successful projects across 50+ countries

24-hour global support response window

From mobile cranes to energy turbines, LDB’s Double Row Different Diameter Ball Slewing Bearings offer reliable, tailored solutions backed by engineering precision and field-proven durability.

Conclusion

Balancing axial capacity and dynamic precision, the Double Row Different Diameter Ball Slewing Bearing offers a best-of-both-worlds solution. With LDB’s expertise as a trusted global manufacturer and supplier, your equipment gets the stability, flexibility, and performance it needs—without compromise.