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63 Series
Home Deep Groove Ball Bearings 63 Series

6306-2RS Deep Groove Ball Bearing | Heavy-Duty Rubber Sealed Performance | 30×72×19 mm

6306-2RS Deep Groove Ball Bearing | Heavy-Duty Rubber Sealed Performance | 30×72×19 mm

The 6306-2RS is a robust, high-precision single-row deep groove ball bearing engineered for exceptional endurance in medium-to-heavy mechanical setups. Unlike metal-shielded models, this bearing is equipped with synthetic rubber seals (2RS) on both sides, which are securely bonded to the outer ring to form a reliable contact seal against the inner ring. This design offers superior defense against water splashes, moisture, and fine dust particles while effectively retaining the internal factory grease. Featuring standard metric dimensions—a 30 mm bore, 72 mm outer diameter, and 19 mm width—the 6306-2RS serves as a highly dependable component for electric motors, agricultural equipment, and heavy industrial machinery.

6306-2RS Deep Groove Ball Bearing 30x72x19 mm | Dual Rubber Contact Seals | High-Load Structural Precision

Developed to offer maximum uptime in challenging environments, the 2RS configuration relies on premium Nitrile Butadiene Rubber (NBR) closures reinforced with steel inserts. This configuration seals off the internal rolling elements and deeply honed raceways from harsh airborne contamination and liquid ingress, keeping the bearing operating smoothly under heavy radial and moderate axial loads. It is the ideal choice for transmission systems, outdoor power equipment, and automotive alternators where preventing environmental contamination is vital to preventing premature wear.

6306-2RS Deep Groove Ball Bearing | Heavy-Duty Rubber Sealed Performance | 30×72×19 mm

Comprehensive Applications

Optimized for high structural integrity and resilient environmental protection, the 6306-2RS is widely utilized across demanding industrial and commercial sectors:

Electric Motors & Power Generation
  • Medium-Sized Industrial Electric Motors
  • Alternators and Generators
  • Submersible and Centrifugal Pumps
Agricultural & Construction Machinery
  • Harvester Conveyors and Combine Components
  • Tractor Power Take-Off (PTO) Shafts
  • Lawn Mower Deck Spindles
Material Handling & Transmissions
  • Industrial Gearboxes and Speed Reducers
  • Heavy-Duty Warehouse Conveyor Rollers
  • Forklift Mast Roller Assemblies
Automotive & Marine Systems
  • Vehicle Wheel Hub Assemblies
  • Pulley Idlers and Belt Tensioners
  • Small Marine Propeller Shaft Supports

Key Performance Features

01. Advanced Contact Rubber Sealing

The dual lip rubber seals (2RS) create a tight physical barrier over the inner ring. This design delivers absolute protection against moisture, liquid splash, and abrasive dust particles, ensuring the internal components remain pristine even in muddy or outdoor operations.

02. High Load Capacity & Fatigue Resistance

Forged from premium-grade GCr15 Chrome Steel (AISI 52100), the deep-groove raceways are precision-ground to sustain substantial radial loads. The dense material structure significantly improves fatigue life and dampens operational vibration under heavy stresses.

03. Maintenance-Free Lubrication Life

Each bearing comes pre-packed with premium, high-pressure lithium grease calibrated for a wide temperature range. The contact seal design eliminates the need for manual re-lubrication, reducing maintenance costs throughout its operational lifecycle.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 63 Series (Medium Metric Series)
Basic Designation 6306
Suffix 2RS / 2RSR / LLU / DDU (Dual Rubber Seals)
Bore Diameter (d) 30 mm
Outer Diameter (D) 72 mm
Width (B) 19 mm
Material (Races & Balls) High-Carbon Chrome Steel (GCr15 / AISI 52100)
Precision Class ABEC-1 (ABEC-3 / ABEC-5 Upgrades Available)
Cage Material Standard Pressed Steel Cage
Dynamic Load Rating (Cʳ) 29.60 kN
Static Load Rating (C₀ʳ) 16.00 kN
Limiting Speed (Grease) 6,500 r/min
Limiting Speed (Oil) --
Weight (approx.) 0.350 kg

Interchange Part Numbers

The 6306-2RS is fully standardized globally and can replace or substitute the following industry designations:

  • NSK: 6306DDU
  • SKF: 6306-2RS1 / 6306-2RSH
  • KOYO: 6306-2RS
  • NTN: 6306LLU
  • EZO: 6306-2RS
  • FAG: 6306-2RSR
  • Timken: 6306-2RS

Design & Configuration

The internal architecture of the 6306-2RS prioritizes long-term component durability within harsh structural frameworks. Unlike shielded options that feature small gaps, the NBR rubber seals ride gently along a precision-machined groove on the inner ring. This creates a highly localized sealing zone that seals in the factory grease matrix while keeping external grime out.

It stands as the optimal upgrade selection for machinery running in dusty or wet conditions, such as outdoor conveyor networks, agricultural gear, and industrial pumps where preventing grit contamination is essential to avoiding premature failure.

"A highly durable, rubber-sealed metric mechanical core engineered to deliver maximum contamination resistance and high load reliability for demanding industrial applications."

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