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63 Series
Home Deep Groove Ball Bearings 63 Series

6308-2RS Deep Groove Ball Bearing | Heavy-Duty Double Rubber Sealed Performance | 40×90×23 mm

6308-2RS Deep Groove Ball Bearing | Heavy-Duty Double Rubber Sealed Performance | 40×90×23 mm

The 6308-2RS is a robust, single-row deep groove ball bearing engineered to deliver superior load-carrying capacity and extended service life in demanding environments. Equipped with tight-fitting, dual contact rubber seals (2RS), this model provides an impenetrable barrier against moisture, heavy dust, and external contaminants while securely retaining its factory-filled lubrication. Built to exact metric dimensions—a 40 mm bore, 90 mm outer diameter, and 23 mm width—the 6308-2RS is the definitive mechanical solution for medium-to-heavy industrial machinery, automotive hubs, and high-torque electric motors.

6308-2RS Deep Groove Ball Bearing 40x90x23 mm | Dual NBR Sealed | High Load Architecture

Designed for "high-endurance, low-maintenance" reliability, the 2RS sealing configuration utilizes durable Nitrile Butadiene Rubber (NBR) that physically contacts the inner ring recess. This architecture effectively shields the highly polished micro-raceways and steel balls from harsh environmental factors. It is the go-to choice for outdoor equipment, agricultural operations, and heavy manufacturing lines where preventing debris ingress is critical to preventing premature mechanical failure.

6308-2RS Deep Groove Ball Bearing | Heavy-Duty Double Rubber Sealed Performance | 40×90×23 mm

Comprehensive Applications

Optimized for rugged operations and substantial radial loads, the 6308-2RS is widely implemented across heavy-duty commercial and industrial sectors:

Agricultural & Heavy Machinery
  • Tractor Gearboxes and Transmissions
  • Combine Harvester Conveyor Systems
  • Industrial Tilling Equipment
Automotive & Transportation
  • Commercial Vehicle Wheel Hubs
  • Heavy-Duty Alternators and Generators
  • Drivetrain Support Shafts
Pumps & Fluid Handling
  • High-Capacity Industrial Water Pumps
  • Air Compressors and HVAC Blowers
  • Centrifugal Pump Shafts
Industrial Automation & Motors
  • Large Scale Electric Motors
  • Factory Conveyor Belt Rollers
  • Mining and Quarry Material Handling

Key Performance Features

01. Superior Contamination Defense

The dual rubber seals (2RS) create a physical contact lip against the inner ring. This highly effective sealing mechanism is purpose-built to block water, dirt, and metallic dust from compromising the internal components, making it ideal for outdoor or wash-down applications.

02. High Dynamic Load Endurance

Manufactured from premium GCr15 (AISI 52100) high-carbon chrome steel, the bearing rings and rolling elements undergo advanced heat treatment. This results in exceptional hardness and fatigue resistance, allowing the bearing to effortlessly support heavy radial forces and moderate axial loads in both directions.

03. Maintenance-Free Longevity

Every 6308-2RS is pre-lubricated at the factory with premium, temperature-stable grease tailored for the bearing's entire operational lifespan. Thanks to the highly secure sealing design, relubrication is unnecessary, significantly reducing equipment downtime and maintenance costs.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 6300 Series (Medium/Heavy Duty)
Basic Designation 6308
Suffix 2RS / 2RS1 (Two Rubber Seals)
Bore Diameter (d) 40 mm
Outer Diameter (D) 90 mm
Width (B) 23 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) 40.8 kN
Static Load Rating (C₀ʳ) 24.0 kN
Limiting Speed (Grease) 4,800 r/min
Limiting Speed (Oil) --
Weight (approx.) 0.635 kg

Interchange Part Numbers

The 6308-2RS adheres to strict international ISO standards, making it a direct drop-in replacement for the following global brand designations:

  • NSK: 6308 DDU
  • SKF: 6308-2RS1 / 6308-2RSH
  • KOYO: 6308 2RS
  • NTN: 6308 LLU
  • EZO: 6308-2RS
  • FAG: 6308-2RSR
  • Timken: 6308-2RS

Design & Configuration

The internal geometry of the 6308-2RS is engineered to prioritize structural integrity under stress. Unlike metal-shielded (ZZ) variants designed purely for speed, the 2RS configuration accepts a slight increase in starting friction in exchange for vastly superior environmental protection. The NBR rubber seals are reinforced with a steel insert for rigidity, snapping securely into the outer ring and wiping against a specialized recess on the inner ring to seal the lubricant inside permanently.

It is the optimal upgrade for machinery operating in compromised environments—such as sawmills, farming terrain, or chemical plants—where bearing failure is simply not an option.

"A rugged, high-capacity radial bearing engineered to deliver unyielding performance and superior sealing in demanding industrial environments."

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