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69 Series
Home Deep Groove Ball Bearings 69 Series

6903-2RS Sealed Ultra-Thin Deep Groove Ball Bearing | 17x30x7 mm for Compact Applications

6903-2RS Sealed Ultra-Thin Deep Groove Ball Bearing | 17x30x7 mm for Compact Applications

The 6903-2RS is a Double Rubber-Sealed Ultra-Thin Series Deep Groove Ball Bearing designed for applications where space constraints and environmental protection are equally critical. Equipped with two effective rubber contact seals (2RS), it provides reliable defense against dust, moisture, and fine contaminants while retaining lubrication. Featuring a 17 mm bore and a slim 7 mm width, this bearing is an excellent choice for compact motors, precision instruments, and small mechanisms operating in potentially contaminated or humid conditions.

6903-2RS Deep Groove Ball Bearing 17×30×7 mm | 69 Series – Ultra-Thin | Double Rubber Sealed

Engineered with an optimized deep groove geometry, this sealed bearing delivers smooth and quiet operation while conserving critical axial space. It achieves speeds up to 20,000 r/min (oil). Ideal for applications with extremely tight installation spaces, it is designed to handle light to moderate radial loads. The double rubber contact seals (2RS) provide effective protection against dust and moisture, making it a reliable choice for miniature motors, power tools, and precision instruments where a slim profile is non-negotiable.

6903-2RS Sealed Ultra-Thin Deep Groove Ball Bearing for Precision and Compact Applications | 17×30×7 Mm

Comprehensive Applications

Ideal for compact assemblies and precision devices across various fields:

Appliance & Consumer Products
  • Household and Personal Care Appliance Motors
  • Cooling Fans for Electronics and IT Equipment
  • Office Automation Drives (Printers, Scanners)
Small Motors & Drives
  • Small AC/DC Motors and Micro Gearmotors
  • Servo and Stepper Motors in Automation
  • Encoder and Sensor Support Bearings
Precision & Medical Equipment
  • Dental and Laboratory Handpiece Drives
  • Diagnostic and Analysis Instrumentation
  • Optical and Positioning Devices
Automotive & Mobility Components
  • Automotive Actuators and Small Pump Motors
  • E-Bike and Personal Mobility Drive Supports
  • Dashboard and Control Module Mechanisms

Key Performance Features

01. Ultra-Thin, Space-Saving Design

At just 7 mm in width, this bearing offers a significant reduction in axial space and overall weight, enabling exceptionally compact and lightweight product designs ideal for size-constrained applications.

02. Precision Performance in Slim Profile

Manufactured from precision-ground chrome steel with optimized internal geometry, it ensures smooth operation characterized by low noise, minimal vibration, and reliable performance even within tightly confined spaces.

03. Integrated Rubber Seal Protection

Two rubber contact seals (2RS) are integrated to provide effective defense against dust, moisture, and contaminants. This design helps extend service life and maintain performance in challenging or unclean environments.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 69 Series – Extra Thin
Basic Designation 6903
Suffix 2RS (Double Rubber Contact Seals)
Bore Diameter (d) 17 mm
Outer Diameter (D) 30 mm
Width (B) 7 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard / P5 Grade Available
Cage Material Steel Stamped
Dynamic Load Rating (Cʳ) 4.75 kN
Static Load Rating (C₀ʳ) 2.36 kN
Limiting Speed (Grease) 16,000 r/min
Limiting Speed (Oil) 20,000 r/min
Weight (approx.) 23 g

Interchange Part Numbers

Common manufacturer equivalents include:

  • SKF: 6903-2RS
  • NSK: 6903DDU
  • FAG: 6903-2RSR
  • NTN: 6903LLU
  • KOYO: 6903LLB

Design & Configuration

The 6903-2RS features dual rubber contact seals as standard, offering reliable protection against light moisture, dust, and incidental contact. This configuration is particularly well-suited for precision equipment and compact assemblies. Where ultra-high-speed operation is required in controlled, debris-free environments, a double metal-shielded variant (6903-ZZ) is available to minimize rotational torque.

"A precision-engineered bearing solution for miniature drives, handheld tools, and confined mechanical assemblies where maintaining a low profile and protecting internal components from contamination are equally critical."

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