Single Row Ball Slewing Bearing

Single Row Ball Slewing Bearing - Economical Four-Point Contact Solution for Light-to-Medium Duty Rotation

Mini excavators, truck-mounted cranes, aerial work platforms, and solar tracking systems use the high-performance single row ball Slewing Bearing with four-point contact ball technology. This bearing type, made from 42CrMo or 50Mn forged steel with hardened raceways (55-62 HRC), provides inexpensive load capacity, compact design, and excellent service life for 360-degree rotating excavator. Single-row four-point contact ball slewing bearings in external gear (011/012), internal gear (013/014), and gearless (010) configurations are direct bolt-in OEM replacements for Caterpillar, Komatsu, Hitachi, Kobelco, and Volvo equipment.

Product Structure and Technical Specifications

Design Configuration

The single-row steel ball slewing ring distributes axial, radial, and moment stresses efficiently by contacting inner and outer raceways at four places. Perfect for space-constrained applications, this bearing handles combined loads in a small cross-section.

Essential structural elements:

• Choose from 42CrMo alloy steel or 50Mn carbon steel for forged steel rings, depending on load requirements and operating conditions.
• Induction hardening at 55-62 HRC reduces plastic deformation and enhances service life in continuous operation.
• Precision Rolling Elements: GCr15SiMn bearing steel balls for smooth rotation (coefficient of friction 0.003-0.008).
• In harsh field conditions, NBR rubber sealing strips provide integrated protection against dust, mud, and moisture.
• Interface: Through-holes on both rings allow bolt attachment to equipment construction without adapters.

Size Range and Gear Options

The thin-section Series Q design provides height-optimized solutions for low-profile crane installations where vertical space is limited, while maintaining adequate load capacity for typical mobile crane operations.

Core Application Markets

Excavator Swing Bearing Replacement

Most tiny (1-5 ton), compact (5-15 ton), and mid-size (15-30 ton) excavators replace swing bearings with single-row ball type slewing bearings. Caterpillar, Komatsu, Hitachi, Kobelco, and Volvo turntable bearings may be replaced directly by the 011 and 013 series external and internal gears. These replacement bearings smooth cabin rotation at a lower cost than OEM components.

Truck-Mounted Cranes and Mobile Cranes

Truck-mounted, transportable, and small crawler cranes benefit from the four-point contact ball slewing ring's load capability, compact design, and cost-effectiveness. For low-profile crane installations, Series Q thin-section variants are ideal for height limits that ensure vehicle stability and road transport standards. The bearing can withstand combined radial, axial, and moment loads, making it appropriate for crane load lifting, boom extension, and wind-loaded slewing.

Aerial Work Platforms and Industrial Turntables

Single-row four-point contact slewing rings provide 360-degree rotation with smooth operation and extended life in aerial work platforms, welding positioners, and industrial turntables. Low-weight L1/L2 series bearings enhance operating duration in battery-powered AWPs and robotic applications. Power consumption during continuous rotation cycles is minimal due to low friction (0.003-0.008).

Solar PV Tracking Systems

Solar tracker systems with 25-year field life use four-point contact ball slewing rings for single-axis and dual-axis tracking systems due to its low friction, longevity, and maintenance-free operation. The sealed construction prevents environmental exposure in outside installations, and the low cost facilitates utility-scale solar farm implementation.

Engineering Advantages Addressing Buyer Concerns

Load Capacity and Service Life

Concerned about premature raceway failure of the single row ball slewing bearing under heavy loads? Our bearings undergo finite element analysis during design phase to optimize stress distribution across the raceway contact zone. Heat treatment optimization achieves uniform hardness depth, preventing surface spalling and extending service life beyond standard industry benchmarks.

Sealing Performance

Dust and mud ingress causing premature bearing failure? Triple sealing architecture combines labyrinth grooves, elastomeric seals, and grease retention channels to block contaminant entry even in high-pressure washdown environments typical of construction and mining equipment.

Corrosion Resistance

Operating in coastal, port, or marine environments? Anti-corrosion coating options and special lubricant formulations provide salt fog resistance for equipment exposed to humid, chloride-rich atmospheres. Surface treatment upgrades extend bearing life in corrosive service conditions.

OEM Replacement Compatibility

Worried about dimensional mismatch preventing installation? Our engineering team provides 1:1 OEM replacement matching services, verifying mounting hole patterns, gear parameters, and interface dimensions against original equipment specifications to ensure drop-in compatibility without modification.

Precision and Noise Control

Need high rotational accuracy for precision applications? CNC machining centers maintain tight tolerances on raceway geometry and mounting surfaces. High concentricity control minimizes runout, while precision grinding reduces vibration and noise for applications in medical equipment, robotics, and automation systems.

Exhibition

We attend many famous international exhibitions such as Shanghai International Maritime Exhibition,Mining World Russia, bauma China, CTT Russia, etc

Partners

Your trust, we cherish in heart all times and will reciprocate that trust with unwavering quality.

Packaging & shipping

Your goods are unique, and their journey should be flawless. Therefore, we offer professional and customized packaging services. Our experienced team will evaluate your goods' characteristics, transportation route, and environmental requirements to recommend the most secure solution, such as: wooden crate packaging, sturdy frame packaging, or composite reinforced packaging (wooden crate + iron frame).

On-Site Measurement and Reverse Engineering Service

When original equipment drawings are unavailable or replacement parts are discontinued, Luoyang Heng Guan Bearing provides On-Site Measurement & Reverse Engineering Services for equipment maintenance and import substitution needs.

Service Process:

1. Field Survey: Engineers visit customer sites (ports, mines, construction sites) with precision measurement instruments
2. Data Collection: Full dimensional survey including outer diameter, center distance, gear module, bolt hole positions, and mounting interface geometry
3. Wear Analysis: Detailed inspection of old component wear patterns and failure modes guides optimization design
4. Reverse Modeling: CAD reconstruction with compensatory design improvements based on actual operating conditions
5. Manufacturing: Complete production workflow from forging through CNC machining, gear cutting, and final inspection
6. Installation Support: On-site guidance ensures proper installation and commissioning

Key Benefits:

• No original drawings required for accurate replacement
• Cost reduction versus OEM imported parts
• Shortened lead time reduces equipment downtime losses
• Performance upgrades through material and structure optimization
• Custom non-standard sizing for special application requirements
• Environmental adaptation for corrosive, high-temperature, or high-dust conditions

This service is particularly valuable for heavy mining equipment, port excavator, construction equipment, and production line turntables where spare parts availability is limited or equipment modifications are needed.

Quality Assurance and Manufacturing Capability

Luoyang Heng Guan Bearing maintains ISO9001 certification with RoHS-compliant products manufactured according to DIN and ISO standards. Our production facility houses CNC vertical lathes, CNC quenching machines, CNC gear shapers, machining centers, grinding machines, and large gear hobbing equipment capable of processing slewing bearings from 50mm to 10,000mm diameter with precision grades covering P0, P6, P5, and P4 classifications.

Full-process quality control includes:

• Coordinate measuring machine verification of dimensional accuracy
• Raceway hardness testing confirms heat treatment effectiveness
• Vibration testing ensures smooth rotation characteristics
• Complete traceability from raw material certification through finished product inspection

The In Stock product ships within 7-15 days from stock. Custom setups take 4-6 weeks, depending on intricacy. Our engineering team provides technical consultation, product design, manufacturing, installation guidance, and old product mapping services to support your project requirements.

FAQ

Q: How do I choose between external gear, internal gear, or gearless configurations?

A: External gear (011 series) suits applications where the drive pinion mounts outside the bearing perimeter. Internal gear (013 series) allows the pinion to mount inside, saving space. Gearless (010 series) is used when hydraulic motors or other drive systems connect directly to the bearing mounting structure.

Q: What is the expected service life under typical excavator duty cycles?

A: With proper lubrication maintenance, service life typically exceeds 8,000-12,000 operating hours in mini excavator applications. Actual life depends on load conditions, maintenance intervals, and environmental factors.

Q: Can these bearings replace original Caterpillar or Komatsu parts directly?

A: Yes, we provide OEM-compatible replacement bearings with verified dimensional matching. Supply your equipment model number or existing bearing markings for compatibility confirmation.

Contact Us

Request CAD drawings, technical specifications, and pricing quotations for your specific single row ball slewing bearing application. Our engineering team is ready to assist with bearing selection, load calculation, and custom design solutions. Contact Us at mia@hgb-bearing.com to discuss your project requirements and reduce equipment downtime with reliable slewing bearing solutions.​​​​​​​