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69 Series
Home Deep Groove Ball Bearings 69 Series

6904-2RS Sealed Ultra-Thin Deep Groove Ball Bearing for Precision Compact Mechanisms | 20×37×9 Mm

6904-2RS Sealed Ultra-Thin Deep Groove Ball Bearing for Precision Compact Mechanisms | 20×37×9 Mm

The 6904-2RS is a Double Rubber-Sealed Ultra-Thin Deep Groove Ball Bearing engineered for applications requiring a slender profile along with reliable contamination protection. Fitted with two rubber contact seals (2RS) on both sides, it effectively shields against dust, moisture, and fine particles while maintaining internal lubrication. With a 20 mm bore and a slim 9 mm width, this bearing offers an ideal solution for compact motors, precision equipment, and small devices where space savings and environmental sealing are essential.

6904-2RS Deep Groove Ball Bearing 20×37×9 mm | 69 Series – Ultra-Thin | Double Rubber Sealed

Built on a space-efficient deep groove geometry, this sealed bearing supports smooth and quiet operation at speeds up to 18,000 r/min (Oil). Designed to carry light to moderate radial loads, the 6904-2RS provides consistent performance and effective sealing where minimal axial space and operational reliability are paramount.

6904-2RS Sealed Ultra-Thin Deep Groove Ball Bearing for Precision Compact Mechanisms | 20×37×9 Mm

Comprehensive Applications

Designed for use across a variety of compact and precision-driven industries:

Medical & Laboratory Instruments
  • Dental Handpiece and Lab Tool Motors
  • Diagnostic and Monitoring Device Drives
  • Pump and Fluid Handling Mechanisms
Automotive & Mobility Applications
  • Automotive Auxiliary Motors and Actuators
  • E-Mobility Drivetrain Support Bearings
  • Dashboard and Control Unit Drives
Small Motors & Precision Actuators
  • Small Industrial and Hobby Motors
  • Servo and Stepper Motor Drives
  • Optical and Sensor Rotary Supports
Electronics & Appliance Systems
  • Cooling Fans for Electronics and Communication Devices
  • Household and Personal Appliance Motors
  • Office and Printing Equipment Mechanisms

Key Performance Features

01. Optimized Ultra-Thin Design

Featuring a slim 9 mm width, the 6904-2RS achieves an optimal balance between space conservation and functional performance. Its compact form factor supports assembly designs with strict axial space limitations while maintaining adequate load support.

02. Reliable Sealing for Challenging Environments

Equipped with two integrated rubber contact seals (2RS), this bearing ensures durable protection against moisture and particulate contamination. This contributes to extended service intervals and reliable operation in humid, dusty, or demanding settings.

03. Smooth and Stable Operation

Precision-engineered from chrome steel with optimized internal clearances, it delivers consistently quiet running with low vibration, ensuring accurate and refined rotational performance for precision mechanisms.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 69 Series – Extra Thin
Basic Designation 6904
Suffix 2RS (Double Rubber Contact Seals)
Bore Diameter (d) 20 mm
Outer Diameter (D) 37 mm
Width (B) 9 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Steel Stamped
Dynamic Load Rating (Cʳ) 5.65 kN
Static Load Rating (C₀ʳ) 2.85 kN
Limiting Speed (Grease) 14,000 r/min
Limiting Speed (Oil) 18,000 r/min
Weight (approx.) 32 g

Interchange Part Numbers

Common manufacturer equivalents include:

  • SKF: 6904-2RS
  • NSK: 6904DDU
  • FAG: 6904-2RSR
  • NTN: 6904LLU
  • KOYO: 6904LLB

Design & Configuration

The 6904-2RS is equipped as standard with two rubber contact seals, making it suitable for applications exposed to dust, humidity, or occasional fluid contact. For high-speed operation in clean and dry environments, the double metal-shielded version (6904-ZZ) is available as an alternative configuration.

"A premier choice for space-sensitive applications including small motors, precision instruments, and compact drives, where reliable sealing and a slim, robust design are simultaneously required."

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