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