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62 Series
Home Deep Groove Ball Bearings 62 Series

6210 Open Type Deep Groove Ball Bearing | Unshielded Medium-Duty Bearing | 50×90×20 mm

6210 Open Type Deep Groove Ball Bearing | Unshielded Medium-Duty Bearing | 50×90×20 mm

The 6210 is a high-performance open-type ball bearing designed for heavy-duty industrial systems where integrated external lubrication is utilized. By omitting physical seals and shields, this unshielded configuration offers the absolute minimum starting torque and zero contact friction. Featuring an industry-standard 50mm bore, a 90mm outer diameter, and a 20mm width, the 6210 allows for unrestricted oil or grease flow, making it a critical rotational component for high-speed enclosed gearboxes, industrial compressors, and internal transmission assemblies.

6210 Deep Groove Ball Bearing 50x90x20 mm | Standard 62 Series | Unshielded for Fluid Lubrication

Engineered for seamless integration into complex, enclosed mechanical architectures, the 6210 utilizes premium GCr15 chrome steel to deliver exceptional radial support and moderate bidirectional axial capacity. Because the internal rolling elements are fully exposed, lubricant can circulate directly through the raceways. This constant fluid exchange provides superior thermal dissipation, effectively carrying away heat during continuous, high-RPM duty cycles. The open design also allows maintenance engineers to perform direct visual inspections of the bearing's internal condition during routine gearbox servicing.

6210 Open Type Deep Groove Ball Bearing | Unshielded Medium-Duty Bearing | 50×90×20 mm

Comprehensive Applications

The 6210 Open Bearing is the definitive solution for machinery featuring built-in oil-bath or oil-mist systems:

Industrial Gearboxes & Transmissions
  • High-torque planetary gear reducers
  • Enclosed industrial drive trains
  • Heavy-duty automotive transmission internals
Manufacturing & Processing Equipment
  • Heavy-duty textile spinning machinery
  • Internal motor drive components
  • Automated machine tool spindles
Pumps & Fluid Handling Systems
  • Large-scale centrifugal pump internal shafts
  • Oil-submerged rotary compressor units
  • High-pressure hydraulic pump drives

Key Performance Features

01. Zero-Friction Rotational Efficiency

Without the physical drag caused by rubber seals or the air resistance of metal shields, the 6210 achieves the highest possible mechanical efficiency. This zero-contact architecture is essential for systems where minimizing energy loss and maximizing power transfer are the primary engineering goals.

02. Optimized Thermal Regulation

In high-speed operations, heat accumulation is a leading cause of component fatigue. The open-type structure allows cooling oil to wash directly over the steel balls and cage, maintaining a stable thermal equilibrium even under heavy industrial loads.

03. High Load-to-Volume Ratio

Belonging to the robust 62 series, this bearing features thicker rings and larger rolling elements than the lighter 60 series. It successfully balances a highly compact 50x90x20mm dimensional footprint with the formidable dynamic load ratings required for heavy industrial power transmission.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 62 Series (Medium Duty)
Basic Designation 6210
Suffix N/A (Open Type)
Bore Diameter (d) 50 mm
Outer Diameter (D) 90 mm
Width (B) 20 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard (P0) / P6 or P5 Available Upon Request
Cage Material Pressed Steel
Dynamic Load Rating (Cʳ) 35.1 kN
Static Load Rating (C₀ʳ) 23.2 kN
Limiting Speed (Grease) 8,500 r/min
Limiting Speed (Oil) --
Weight (approx.) 0.46 kg

Interchange Part Numbers

Directly compatible with industry-standard unshielded 50mm bore bearings:

  • SKF: 6210
  • NSK: 6210
  • FAG6210
  • NTN: 6210
  • KOYO: 6210
  • Nachi: 6210

Design & Configuration

The 6210 Open Bearing is supplied with a protective coating of light anti-rust preservative oil. It is explicitly designed to be lubricated on-site using a high-grade machine oil or specialized grease tailored to the specific application's temperature and velocity. If the bearing will be mounted in an exposed environment without an external protective housing, we strongly recommend utilizing the 6210-ZZ or 6210-2RS models to prevent catastrophic contamination.

"Engineered for unrestricted fluid dynamics and maximum power transfer, the 6210 Open Type is the core component for enclosed industrial architectures."

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