RKS 061.20.0744 slewing bearing
Quenched and tempered hardness: HB 229–269
Raceway surface hardness: HRC 55–62
Hardened layer depth: ≥ 3.5 mm
Raceway surface roughness: Ra ≤ 0.8 μm
Seals: Double-lip NBR on both sides (-30 to +100°C)
Lubrication: NLGI #2 lithium-based grease (customizable based on operating conditions)
Cage: PA66 nylon (brass optional for high-temperature applications)
Precision class: P0 (standard) / P6 / P5 (customizable)
Factory inspection: 100% dimensional inspection + hardness + rotational torque + clearance + magnetic particle testing
Certificates: ISO 9001:2015; EN 10204 3.1 material report available; third-party inspection (SGS/BV/TÜV) can be arranged
- Product Description
RKS 061.20.0744 Slewing Bearing – Precision Four-Point Contact Solution for Heavy-Duty Rotating Equipment
The RKS 061.20.0744 Slewing Bearing is a small, four-point contact ball bearing with excellent axial load capacity and accurate rotational control. This external-geared bearing has an axial dynamic load rating of 262 kN and static capacity of 1840 kN with an outer diameter of 838.8 mm, inner diameter of 672 mm, and thin-section height of 56 mm. Module-6, 138-tooth external gearing for direct motor coupling and forged 42CrMo steel with induction-hardened raceways (HRC 55–62) make it perfect for excavators, cranes, welding positioners, and solar trackers.
Technical Specifications
Basic Dimensions
Parameter | Value | Unit | Notes |
Model | RKS.061.20.0744 | — | Heng Guan equivalent: 061.20.0744 |
Structure Type | Single-row four-point contact ball | — | |
Gear Position | External gear | — | |
Raceway pitch diameter (dm) | 744 | mm | Model designation origin |
Outer Diameter (OD) | 838.8 | mm | 33.0236 in |
Outer ring shoulder diameter (D1) | 745.5 | mm | |
Inner Diameter (ID) | 672 | mm | 26.4567 in |
Inner ring shoulder diameter (d1) | 742.5 | mm | |
Total Height (H) | 56 | mm | 2.2047 in |
Weight | 59 | kg | 130.1 lb |
Mounting Bolt Holes
Parameter | Outer Ring | Inner Ring | Unit |
Bolt circle diameter | Je = 785 | Ji = 698 | mm |
Bolt hole specification | M12 | Ø13.5 | mm |
Quantity | 36 | 40 | pcs |
Gear Parameters
Parameter | Value | Unit |
Pitch circle diameter (d01) | 828 | mm |
Module (m) | 6 | — |
Number of teeth (z) | 138 | — |
Addendum modification (k·m) | -0.6 | mm |
Face width (b) | 45.5 | mm |
Permissible tangential force (normal) | 14.2 | kN |
Permissible tangential force (max) | 28.4 | kN |
Gear accuracy | ISO 1328 Grade 9 (Grade 7 optional) | — |
Tooth surface hardness | HRC 50–58 (induction hardened) | — |
Load Ratings
Parameter | Value | Unit |
Axial dynamic load rating (C) | 262 | kN |
Axial static load rating (C0) | 1840 | kN |
Raceway load curve | r4 | — |
Bolt load curve | b4 | — |
Axial clearance | ≤ 0.30 | mm |
Radial clearance | ≤ 0.26 | mm |
Ball diameter | 20 | mm |
Materials and Manufacturing
Parameter | Outer/Inner Ring | Rolling Elements | Unit |
Material | 42CrMo (EN 1.7225) / 50Mn | GCr15 (100Cr6) | — |
Quenched hardness | HB 229–269 | — | HB |
Raceway surface hardness | HRC 55–62 | HRC 60–64 | HRC |
Hardened layer depth | ≥ 3.5 | — | mm |
Raceway surface roughness | Ra ≤ 0.8 | — | μm |
Sealing | Double-lip NBR (-30~+100°C) | — | — |
Lubrication | NLGI #2 lithium grease (customizable) | — | — |
Cage | PA66 nylon (brass for high temp) | — | — |
Precision class | P0 standard / P6 / P5 optional | — | — |
Factory testing | 100% dimensional + hardness + torque + clearance + magnetic particle inspection | — | — |
Certifications | ISO 9001:2015; EN 10204 3.1 material reports; SGS/BV/TÜV available | — | — |
Industry Applications
Construction Excavator
The excavator slewing bearing, used in 15-25 ton excavators, mobile cranes, and crawler cranes, allows for 360° rotation with teeth directly attached to the swing motor. The four-point contact structure stabilizes digging and load handling by managing lifting axial forces and boom tilting moments.
Port Equipment
In all weather situations, the port crane slewing bearing and harbor crane turntable work under low-speed, heavy-load circumstances. Anti-corrosion coatings prevent salt spray and double-lip seals prevent contamination during prolonged duty cycles.
Wind Energy
The wind turbine yaw bearing and slewing ring are essential for precise nacelle placement in small wind turbines. Low breakaway torque and alternating load resistance enable wind tracking and energy efficiency.
Solar Trackers
The solar tracker slewing motor and tracking system bearing enable daily multi-position changes for single and dual-axis trackers. Maintenance-free design and low-temperature starting lengthen remote installation service intervals.
Offshore and Marine Equipment
The RKS 061.20.0744 slewing bearing, deployed as an offshore crane bearing, marine slewing ring, and winch turntable, supports ship-mounted cranes, platform turntables, and winches. Hot-dip zinc or nickel plating survives seawater corrosion; optional FKM seals endure harsh maritime conditions.
Mine Work
The slewing bearing and mining turntable are integrated into stacker reclaimers and crusher station turntables. Lubrication film integrity requires double-lip seals and grease replenishment channels in high-dust settings.
Industrial Automation
The welding positioner and rotary table bearings are used for both. Low-profile designs with direct motor coupling are possible with the 56 mm thin-section profile in tight workplaces.
Communication and Radar Systems
Radar antenna pedestals and satellite dishes need slewing rings and turntables. Low clearance and smooth rotation provide precise tracking; optional P5-grade accuracy fulfills tight placement tolerances.
Fun Equipment
Ferris wheels and observation vehicles rely on slewing and amusement ride bearings. Passenger safety is ensured by safety factors ≥ 1.45, dual sealing, and traceable magnetic particle inspection reports
Specialized Cars
The bearing and boom lift slewing are integrated into aerial work platforms and fire truck ladders. Compactness and lightness improve payload and mobility.
Certification
FAQ
Q: Is RKS.061.20.0744 a direct replacement for SKF or Rothe Erde?
A: Yes. Mounting dimensions (dm 744 mm, OD 838.8 mm, ID 672 mm, H 56 mm, bolt circles 785/698 mm, M12×36 / Ø13.5×40) match original specifications. Compatible with legacy numbers E.850.20.00 B, 2IE.083.00, and VSA 20 0744 N. No structural modifications required.
Q: What load capacity does RKS.061.20.0744 offer?
A: Axial dynamic rating C = 262 kN, static C0 = 1840 kN. Raceway curve r4 and bolt curve b4 define static limits. Gear tooth forces: 14.2 kN normal / 28.4 kN maximum.
Q: What are the gear specifications?
A: External gear, module 6, 138 teeth, pitch circle Ø828 mm, addendum modification -0.6 mm, face width 45.5 mm. ISO 1328 Grade 9 standard (Grade 7 available).
Q: What materials and precision grades are available?
A: Forged 42CrMo or 50Mn rings, GCr15 balls, induction-hardened raceways HRC 55–62. Precision P0 standard; P6/P5 optional. Custom bolt patterns, gear modules, and seals supported.
Q: What is the lead time and MOQ?
A: MOQ 1 piece. In-stock units ship within 7–15 days. Custom setups take 4–6 weeks, depending on intricacy. FOB/CIF/DDP terms available.
Contact Us
For inquiries regarding the RKS 061.20.0744 slewing bearing's technical datasheets, custom configurations, or sample requests, reach out to mia@hgb-bearing.com. Our engineering team will confirm dimensional compatibility and provide application-specific recommendations within 24 hours.
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