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  • Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing
  • Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing
  • Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing
  • Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing
  • Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing
  • Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing
Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing

Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing

  • 1 - 9 Pieces
    $580
  • >= 10 Pieces
    $460
View product details

Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Smooth Rotation and Load Handling: Designed as a high-precision slew ring bearing, enabling 360-degree rotational movement in Kubota mini excavators (U15-3, U20-3, U30-3, etc.).
  • Durability and Precision: Engineered with corrosion-resistant metal (steel/aluminum) and a robust structure to withstand heavy-duty operations, ensuring precise torque transmission and long-term reliability.

Key features

  • 1. Corrosion-Resistant Metal Construction

    • With a corrosion-resistant metal body, ensure long-lasting durability in harsh construction environments. The polished finish reduces wear and extends operational lifespan compared to standard steel components*.

  • 2. Customizable Mounting Design

    • With precision-engineered mounting holes, adapt seamlessly to diverse installation configurations, simplifying integration into Kubota excavators and reducing downtime during assembly*.

  • 3. High-Load Capacity Performance

    • With a robust gear-tooth design, handle 20% higher torque loads than conventional slew bearings, ensuring reliability in heavy-duty excavation and rotation tasks*.

  • 4. Kubota-Specific Precision Engineering

    • Engineered for Kubota U15-3/U20-3/U30-3 models, deliver precise 360-degree rotation critical for compact excavator maneuverability, outperforming generic aftermarket alternatives*.

  • 5. Industrial-Strength Durability Standards

    • Manufactured to meet heavy machinery industry standards, guarantee structural integrity and safety in continuous operation, surpassing basic bearing certifications for construction equipment*.

Product details

Mini Excavator U15-3 U20-3 U30-3 Slew Ring KX030-3 KX71 KX91-3S Swing Bearing RA221-19112 RC511-19110 Slew Bearing

The Kubota Mini Excavator Slew Ring Bearing (RA221-19112/RC511-19110) is a precision-engineered component designed for seamless rotational movement in Kubota excavators. Crafted from high-strength corrosion-resistant metal, this bearing ensures durability in harsh construction environments while maintaining structural integrity under heavy loads.

Technical specifications

FeatureSpecificationBenefit
MaterialHigh-strength steel with corrosion-resistant coatingWithstands extreme temperatures and outdoor exposure
DesignCircular hub with evenly spaced mounting holes and precision-cut gear teethEnables precise torque transmission and customizable installation
CompatibilityFits Kubota models U15-3, U20-3, U30-3, KX030-3, KX71, KX91-3SDirect replacement for OEM parts with guaranteed fitment
Load Capacity5,000 kg (Base), 8,000 kg (Pro)Supports heavy-duty machinery operations
Surface FinishSmooth, polished metal surfaceReduces friction and wear for longer lifespan
Shelf Life1 year (stored in dry conditions)Ensures reliability when deployed within warranty period

Customization guide

Adjustable mounting hole patterns can be tailored to fit non-Kubota machinery. Gear tooth spacing and thickness can be modified to meet specific torque requirements, enabling compatibility with custom mechanical systems.

Get inspired

This slew ring bearing is the backbone of excavator mobility. Whether you’re demolishing structures or grading land, its robust design ensures smooth, reliable rotation—critical for precision in demanding construction scenarios.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Load Capacity5,000 kg+20% (6,000 kg)+30% (8,000 kg)*
Rotational Speed120 RPM150 RPM180 RPM
Material HardnessHRC 50HRC 55HRC 60
CertificationISO 9001ISO 9001 + APIISO 9001 + API + SAE

Supplier's note

  1. Technical Breakthroughs:

    • Corrosion-resistant coating: Extends lifespan in wet/dusty environments by 40% compared to standard bearings.
    • Precision-machined teeth: Achieves ±0.01mm tolerance for smoother gear meshing, reducing operational noise by 30%.
    • Enhanced load capacity: The Pro model’s HRC 60 steel withstands triple the industry-standard stress for heavy machinery.

  2. Version Selection Guide:

    • Base Model: Ideal for routine excavation tasks (e.g., landscaping) where standard load requirements suffice.
    • Advanced Model: Suitable for mid-sized construction projects requiring faster rotational speeds (e.g., trench digging).
    • Pro Model: Designed for heavy-duty applications like demolition or mining, where extreme loads and durability are critical.

    With the Pro version’s 8,000 kg load capacity, operators can safely maneuver through rocky terrain. Paired with its HRC 60 steel, this creates a 50% longer service life than competitors’ bearings.

Frequently asked questions

  • Which Kubota mini excavator models is the SHANSHI slew ring RA221-19112 compatible with?

  • How do I clean and maintain a Kubota swing bearing to extend its lifespan?

  • What materials are used in SHANSHI slew bearings, and why are they superior?

  • Can I customize the mounting holes on the Kubota slew ring for non-standard applications?

  • Is the SHANSHI slew bearing certified for heavy-duty machinery use?

  • What applications are best suited for the Kubota U30-3 slew bearing?

  • How does the SHANSHI slew ring improve excavator performance compared to generic bearings?

  • What’s the warranty period for SHANSHI swing bearings, and how do I store them?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Material QualityHeavy-duty machinery (excavators, cranes)Industry Standard: 42CrMo steel (ASTM A394)
Our Base: 42CrMo + heat treatment (▲15% tensile strength)
Our Advanced: 86CrMoV7 steel (▲30% fatigue resistance over Base)		Base: Enhanced durability for prolonged use; Advanced: Superior resistance to deformation under stressAdvanced version may require specialized installation tools due to premium alloy composition
Load CapacityHigh-torque applications (mining, construction)Industry Standard: 120 kN (ISO 281)
Our Base: 150 kN (▲25%)
Our Advanced: 180 kN (▲20% over Base)		Base: Supports medium-load excavators (e.g., KX030-3); Advanced: Compatible with heavy-duty models (e.g., KX91-3S)Higher load capacity increases weight, limiting portability in compact spaces
Noise LevelUrban construction sitesIndustry Standard: 45 dBA (quieter than lawnmower)
Our Base: 43 dBA (▲2 dB reduction)
Our Advanced: 40 dBA (▲3 dB reduction via sound-dampening grooves)		Base: Meets OSHA noise regulations; Advanced: Ideal for noise-sensitive environmentsAdvanced design may reduce heat dissipation slightly
Corrosion ResistanceMarine or chemical exposure environmentsIndustry Standard: 500 hours (ASTM B117 salt spray)
Our Base: 800 hours (▲60%)
Our Advanced: 1,200 hours (▲50% over Base)		Base: Resists mild chemical splashes; Advanced: Withstands harsh marine conditionsAdditional coatings on Advanced may add 10% to production cost
Mounting OptionsCustomized machinery assemblyIndustry Standard: Fixed 6-hole pattern
Our Base: Adjustable 8-hole pattern (▲33% flexibility)
Our Advanced: Modular slots + alignment guides (▲50% customization)		Base: Fits most Kubota models (U15-3 to U30-3); Advanced: Adapts to non-Kubota legacy systemsAdvanced requires CAD design tools for optimal alignment
Shelf LifeLong-term storage in warehousesIndustry Standard: 6 months (moisture-sensitive packaging)
Our Base: 12 months (vacuum-sealed, matches product specs)
Our Advanced: 24 months (desiccant + anti-corrosion coating)		Base: Meets standard storage needs; Advanced: Ensures readiness for delayed projectsAdvanced packaging increases storage space requirements

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