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62 Series
Home Deep Groove Ball Bearings 62 Series

626 Open Miniature Deep Groove Ball Bearing | 6×19×6 mm for Oil Bath & Internal Enclosures

626 Open Miniature Deep Groove Ball Bearing | 6×19×6 mm for Oil Bath & Internal Enclosures

The 626 Open is a high-precision miniature radial ball bearing designed for internal machinery applications where external contamination is not a factor. Manufactured without shields or rubber seals, this unshielded bearing provides completely unrestricted access to the balls and raceways. This open architecture makes it the ultimate choice for enclosed systems that utilize continuous oil bath or oil mist lubrication. With a 6mm bore, a 19mm outer diameter, and a 6mm width, it delivers absolute minimum rolling resistance and exceptional heat dissipation.

626 Deep Groove Ball Bearing 6x19x6 mm | Miniature 600 Series | High-Speed Rotation

Engineered to exacting ISO tolerances, the 626 Open belongs to the versatile miniature 600 series. Because it lacks closure components, it completely eliminates the dragging friction commonly associated with shielded or sealed bearings. This allows the 626 to achieve the highest possible RPM thresholds in its size category. It is an indispensable component for highly sensitive precision instruments, internal gearboxes, and micro-transmissions where rapid fluid circulation and frictionless motion are top priorities.

626 Open Miniature Deep Groove Ball Bearing | 6×19×6 mm for Oil Bath & Internal Enclosures

Comprehensive Applications

Optimized for enclosed, clean environments and continuous lubrication systems:

Precision Instruments & Equipment
  • Sensitive measuring tools and optical devices
  • Clockwork mechanisms and analog instrumentation
  • Micro-medical devices and laboratory centrifuges
  • Anemometers and weather monitoring equipment
Internal Gearboxes & Transmissions
  • Micro-motor internal support shafts
  • Enclosed planetary gear systems
  • Robotics actuators and internal joint assemblies
  • High-speed pneumatic tool internal turbines
Hobby & Model Engineering
  • Internal RC car engine components
  • Model helicopter rotor heads
  • Scale locomotive drivetrains
Office & Automation Machinery
  • Internal paper feeding mechanisms in printers
  • High-speed sorting machine rollers
  • Light-duty automated assembly line parts

Key Performance Features

01. Absolute Minimum Friction

By omitting seals and shields entirely, the 626 Open eliminates all seal-to-inner-ring contact drag. This "zero-drag" design significantly lowers startup torque and running friction, allowing small motors and delicate instruments to operate at peak efficiency with minimal power loss.

02. Unrestricted Lubrication Access

The open cage design allows lubricating oil or fluid to flow freely through the rolling elements. This constant circulation not only ensures optimal hydrodynamic lubrication at extreme speeds but also actively carries heat away from the bearing, drastically reducing operating temperatures in high-stress internal environments.

03. Forged GCr15 Chrome Steel

Despite its small 6x19x6mm dimensions, the 626 Open is manufactured from premium, vacuum-degassed GCr15 chrome steel (SAE 52100). The precisely ground deep-groove raceways provide excellent load distribution, allowing this miniature bearing to effortlessly handle high-speed radial loads and moderate axial thrust.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series Miniature 600 Series
Basic Designation 626
Suffix None (Open Type)
Bore Diameter (d) 6 mm
Outer Diameter (D) 19 mm
Width (B) 6 mm
Material (Races & Balls) High-Carbon Chrome Steel (GCr15 / AISI 52100)
Precision Class ABEC-1 (ABEC-3 / ABEC-5 Upgrades Available)
Closure Type Open (Unshielded / Unsealed)
Dynamic Load Rating (Cʳ) 2.34 kN
Static Load Rating (C₀ʳ) 0.89 kN
Limiting Speed (Grease) 36,000 r/min
Limiting Speed (Oil) 43,000 r/min
Weight (approx.) 0.008 kg

Interchange Part Numbers

A direct drop-in equivalent for the following manufacturer parts:

  • NSK: 626
  • SKF: 626
  • KOYO: 626
  • NTN: 626
  • EZO: 626
  • FAG: 626
  • Nachi: 626

Design & Configuration

The 626 Open is shipped with a light anti-rust oil, making it ready for immediate integration into your custom lubrication systems. If your application is exposed to dust or moisture, Welink Bearing also manufactures this exact size in metal-shielded (626-ZZ) and rubber-sealed (626-2RS) configurations. For highly corrosive environments, stainless steel equivalents (SS626) can be supplied upon request.

"The 626 Open maximizes efficiency by eliminating friction, offering engineers a high-velocity, free-spinning solution for internal precision assemblies."

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