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62 Series
Home Deep Groove Ball Bearings 62 Series

6203 Open Deep Groove Ball Bearing | High Speed Unsealed Bearing | 17×40×12 mm

6203 Open Deep Groove Ball Bearing | High Speed Unsealed Bearing | 17×40×12 mm

The 6203 Open is a versatile, light-series ball bearing designed for applications requiring maximum rotational speed and efficient heat dissipation. Unlike sealed variants, this open-type configuration features no contact seals or shields, allowing for minimal friction torque and the ability to utilize external lubrication systems tailored to specific operating conditions. With a compact 17mm bore, 40mm outer diameter, and 12mm width, it serves as a critical component in electric motors, household appliances, and automotive accessories where the housing provides sufficient environmental protection.

6203 Deep Groove Ball Bearing 17x40x12 mm | Light Duty 62 Series | Open Design (No Seals)

Engineered for performance in clean or protected environments, the 6203 Open utilizes high-carbon GCr15 chrome steel races and balls to ensure durability under continuous operation. The absence of sealing elements means this bearing relies on proper housing integration to keep contaminants out, but it offers superior speed capabilities compared to rubber-sealed counterparts. Pre-lubricated with standard grease for immediate use, it allows for easy re-lubrication during maintenance cycles, extending service life in high-cycle machinery. While it lacks the inherent protection of the 2RS model, its low-friction design makes it the preferred choice for high-RPM drives and precision instruments.

6203 Open Deep Groove Ball Bearing | High Speed Unsealed Bearing | 17×40×12 mm

Comprehensive Applications

The 6203 Open is widely utilized across industries where speed and accessibility outweigh the need for integrated sealing:

Electric Motors & Power Tools
  • Small AC/DC motor armatures
  • Handheld drill and grinder spindles
  • Cooling fan motor shafts
Automotive Components
  • Alternator and generator pulleys
  • Idle pulleys and tensioners
  • Interior blower motor assemblies
Home Appliances & Consumer Electronics
  • Washing machine drum supports (protected housings)
  • Vacuum cleaner motor bearings
  • Exercise equipment flywheels
Industrial Machinery
  • Gearbox shafts within enclosed casings
  • Textile machinery rollers
  • Printing press guide rollers

Key Performance Features

01. Optimized for High-Speed Rotation

The primary advantage of the 6203 Open design is the lack of seal friction. This allows the bearing to achieve higher limiting speeds compared to sealed versions, making it ideal for applications where RPM is a critical factor. The open design also facilitates better heat escape from the rolling elements.

02. Flexible Lubrication Options

Since the bearing cavity is accessible, users are not locked into factory grease fills. This allows maintenance teams to apply specialized lubricants suited for extreme temperatures or specific load conditions, providing greater control over the bearing's operational lifecycle.

03. Compact & Lightweight Design

As part of the 62 series, the 6203 offers a robust load capacity relative to its small footprint. Its lightweight construction (approx. 0.069 kg) reduces overall rotational mass, contributing to energy efficiency in motor-driven systems and reducing inertia during start-stop cycles.

Technical Specifications

Bearing Type Single Row Deep Groove Ball Bearing
ISO Dimension Series 62 Series (Light Duty)
Basic Designation 6203
Suffix Open (No Seals/Shields)
Bore Diameter (d) 17 mm
Outer Diameter (D) 40 mm
Width (B) 12 mm
Material (Races & Balls) Chrome Steel (GCr15 / SAE 52100)
Precision Class Standard (P0) / P6 or P5 Available Upon Request
Seal Type None (Open)
Dynamic Load Rating (Cʳ) 9.56 kN
Static Load Rating (C₀ʳ) 4.75 kN
Limiting Speed (Grease) 17,000 r/min
Limiting Speed (Oil) 20,000 r/min
Weight (approx.) 0.069 kg

Interchange Part Numbers

Directly compatible with industry-standard 17mm bore open bearings:

  • SKF: 6203
  • NSK: 6203
  • FAG6203
  • NTN: 6203
  • KOYO: 6203
  • Nachi: 6203

Design & Configuration

The 6203 Open is intended for installation within protected housings or clean environments. Standard grease lubrication is effective for temperatures between -30°C and +110°C. For applications exposed to dust or moisture, we recommend upgrading to the 6203-2RS (Rubber Sealed) or 6203-ZZ (Metal Shielded) variants to prevent premature wear. For high-precision requirements, P5 and P6 precision grades are available to reduce vibration and noise levels in sensitive equipment.

"Maximizing speed while minimizing friction, the 6203 Open delivers efficient rotational power for protected mechanical systems."

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