Single-row ball slewing ring (HS series)

Single-Row Ball Slewing Ring (HS Series) – Compact Four-Point Contact Solution for Medium-Duty Rotary Equipment

The Single-row ball slewing ring (HS series) from Luoyang Heng Guan Bearing Technology delivers enterprise-grade rotational support combining four-point contact geometry with lightweight construction. This single row ball Slewing Bearing handles simultaneous axial, radial, and moment loads through arc raceway design, achieving load capacities up to 5000 kN while maintaining 40% weight reduction versus double-row configurations. Engineered for crane systems (5-50 ton class), excavator swing mechanisms, welding positioners, and aerial work platforms, the HS series provides mounting diameter flexibility from 400 mm to 2500 mm with precision grades reaching P5. Heat-treated 42CrMo rings ensure raceway hardness ≥ 55 HRC across 3.5 mm case depth, delivering operational lifespan exceeding 15,000 service hours under proper maintenance protocols.

Technical Architecture of Series HS-Single Row Ball Slewing Bearing

Four-Point Contact Load Distribution

The single row four point contact ball slewing bearing employs arc-shaped raceways where each ball maintains simultaneous contact at four strategic points. This geometry enables load triangulation—axial forces distribute across upper/lower contact angles while radial loads transfer through lateral contact zones. Unlike traditional deep groove arrangements, this Type HSW Series configuration eliminates the need for auxiliary support bearings in compact installations.

Structural Composition

You'll find two precision-machined seat rings forming the assembly. The inner/outer rings feature integrated mounting holes compatible with bolted connections using ISO metric fasteners (Grade 10.9 minimum). The steel ball complement, separated by nylon or brass cages, rolls within induction-hardened raceways while polyurethane seals block contaminant ingress. Optional gear configurations include external gear slewing bearing or internal gear slewing bearing variants, enabling direct motor-pinion drive without intermediate gearboxes.

Material Engineering

Ring forgings utilize 50Mn medium-carbon steel for standard applications or 42CrMo alloy steel where impact resistance matters. The slewing bearing 42CrMo/50Mn material selection directly impacts fatigue life—42CrMo delivers 28% higher toughness in sub-zero environments. Balls manufactured from slewing bearing GCr15 chrome steel undergo vacuum degassing, ensuring homogeneous carbide distribution for raceway longevity.

Specifications

Performance Parameters

Industry Applications Requiring Compact Rotation

Your equipment benefits when space constraints meet multi-directional loading:

Construction Excavator: The excavator slewing bearing variant supports 360° cab rotation in 15-ton class machines, handling boom-induced moments while withstanding track vibration. Small crane slewing bearing models fit truck-mounted systems where chassis height limits bearing envelope.

Industrial Automation: Welding manipulator bearing and welding positioner bearing solutions maintain <0.02 mm radial runout for robotic torch positioning. The turntable bearing configuration suits automated assembly lines requiring indexed rotation.

Aerial Access Equipment: Aerial work platform slewing bearing and aerial lift slewing ring designs meet EN280 safety standards, providing failsafe rotation for boom lifts operating at 20-meter working heights.

Material Handling Systems: Rotary conveyor bearing installations transfer granular materials through 90° direction changes, while tower crane slewing ring assemblies anchor luffing jibs in construction sites.

Specialized Rotary Systems: Radar turntable bearing variants maintain <0.01° positioning accuracy for tracking systems, demonstrating the HS series slewing bearing versatility across defense and civil aviation sectors.

Addressing Critical Procurement Concerns

OEM Replacement Compatibility Challenge

Your primary concern—non-OEM part fitment—gets resolved through 1:1 technical drawing verification. Our engineering team cross-references your existing bearing's bolt circle diameter, gear tooth profile, and raceway curvature against production templates. For obsolete models lacking documentation, we provide on-site measurement services, capturing dimensional data using laser scanners and creating reverse-engineered CAD models. This ensures slewing bearing replacement components achieve drop-in compatibility without machining modifications to your equipment.

Unpredictable Delivery Cycles

The In Stock product ship within 7-15 days from stock. Custom setups take 4-6 weeks, depending on intricacy. We maintain semi-finished ring inventory in popular size ranges (800-1200 mm diameters), enabling rapid customization of gear specifications and mounting holes. This flexible production approach—combining emergency stock with adaptive manufacturing—minimizes your downtime compared to 12-week lead times typical of overseas suppliers.

Load Capacity Validation

The Single-row ball slewing ring (HS series) for heavy-duty applications demands finite element analysis (FEA) confirmation. We simulate your operational loads—combining static weight, dynamic shock factors, and wind moments—to verify raceway stress remains below material yield thresholds. Reinforced raceway profiles increase contact ellipse area by 18%, preventing stress concentration failures common in underspecified bearings.

Sealing Integrity in Harsh Environments

Triple-lip sealing architecture combines polyurethane contact seals with labyrinth grease retention channels. This configuration blocks particulate ingress down to 10-micron dust while maintaining grease containment during ±5° misalignment conditions—critical for excavator swing bearing installations in mining operations.

Quality Control Standards

Every single row ball slewing ring undergoes:

· Material Spectrometry: Verifying alloy composition per EN 10083-3

· Ultrasonic Testing (UT): Detecting internal voids exceeding 1.5 mm

· Raceway Hardness Mapping: Confirming 55+ HRC across effective case depth using Rockwell indentation

· CMM Dimensional Inspection: Validating mounting hole positions within ±0.05 mm tolerance

· Clearance Measurement: Ensuring axial play matches application preload requirements (typically 0.02-0.08 mm)

These protocols align with ISO 9001 quality systems, providing full traceability from raw material mill certificates through final assembly.

Manufacturing Capabilities

As a dedicated slewing bearing manufacturer and slewing bearing factory based in Luoyang's industrial cluster, our facility operates:

· CNC vertical lathes (5-meter swing capacity) for large ring turning

· Induction hardening systems delivering controlled 3.5 mm case depth

· Gear hobbing machines processing modules up to m12 with DIN 5 accuracy

· Grinding equipment achieving Ra 0.8 surface finish on raceways

This integrated production chain enables custom slewing bearing and OEM slewing bearing projects, accommodating special material requests or modified gear profiles without third-party dependencies.

Certification

FAQ

Q: Can this bearing handle both axial and radial loads simultaneously?

A: Yes. The four-point contact design distributes combined loads across contact angles. For a 1000 mm bearing, typical capacity reaches 800 kN axial + 400 kN radial concurrently.

Q: What differentiates 42CrMo from 50Mn material?

A: 42CrMo provides superior impact toughness—critical for shock-loaded cranes—while 50Mn offers cost efficiency for steady-state rotational applications like conveyors.

Q: How often should lubrication occur?

A: Standard guidance recommends every 100 operating hours. High-dust environments require 50-hour intervals to flush contaminants effectively.

Q: Is the bearing suitable for continuous 24/7 operation?

A: Absolutely. Proper grease selection (NLGI Grade 2 lithium complex) and thermal management maintain bearing temperatures below 80°C during continuous duty cycles.

Partner With Precision Engineering Experts

Luoyang Heng Guan Bearing Technology operates as your technical partner, not merely a slewing bearing supplier China. Our engineering team collaborates on load calculations, mounting recommendations, and maintenance protocols tailored to your equipment. Whether you require light profile slewing ring solutions for compact excavator or compact slewing bearing designs meeting stringent envelope constraints, we deliver application-specific answers.

For slewing bearing price quotations matching your technical specifications, download our dimensional catalog and technical datasheets. Verify compatibility through sample evaluation programs, or submit your legacy bearing drawings for reverse-engineering assessment. Our specialists stand ready to confirm fitment details and delivery schedules.

Contact ​​​​​​​us

Contact Us at mia@hgb-bearing.com to initiate your project discussion for the Single-row ball slewing ring (HS series), request test samples, or access CAD integration files for design validation. Bookmark this resource for future procurement cycles and share specifications with your engineering team for collaborative review.