6204 Bearing: Dimensions, Types, and Selection Guide for Engineers

The deep groove 6204 bearing is one of the most widely used deep groove ball bearings in modern machinery. Known for its durability, precision, and versatility, this bearing is found in electric motors, automotive systems, agricultural equipment, and industrial machinery. This guide provides a comprehensive overview of the 6204 bearing — including its structure, dimensions, seal options, technical specifications, and applications — to help engineers, technicians, and purchasing decision-makers select the right bearing for their needs.

What is a 6204 Bearing?

The 6204 bearing is a single row deep groove ball bearing designed to carry both radial and limited axial loads. Its raceway grooves are slightly larger than the ball radius, providing point contact that reduces friction and supports stable rotation at high speeds. While often used individually in applications such as motors and gearboxes, 6204 bearings can also be paired in specific arrangements when axial load balancing is required.

Composition of 6204 Bearing

• Inner Ring & Outer Ring – Form the raceways for the balls

• Balls (rolling elements) – Distribute load evenly with minimal friction

• Cage (retainer) – Keeps balls spaced and guided, commonly made of pressed steel or polyamide

• Raceway Groove – Deep and precise for stable high-speed rotation

6204 Bearing Dimensions

• Inner Diameter (d): 20 mm

• Outer Diameter (D): 47 mm

• Width (B): 14 mm

These dimensions are standardized, ensuring global interchangeability across brands.

Technical Specifications of 6204 Bearing

• Bearing Type: Single row deep groove ball bearing

• Material: High-quality bearing steel (GCr15/100Cr6)

• Load Direction: Primarily radial, with moderate axial capacity

• Precision Class: JIS Grade 0 / ISO Normal Class

• Cage Type: Stamped steel (common), polyamide (optional in some brands)

• Standards: Metric series

Key Features of 6204 Bearing

• Robust and versatile design

• High-speed capability with low noise and vibration

• Long service life with proper lubrication

• Cost-effective and widely available

• Minimal maintenance requirements

Seal Options for 6204 Bearing

Open Type (6204)

• No seals or shields

• Lowest friction, supports high-speed operation

• Requires clean environments and frequent lubrication

Single Shielded (6204Z)

• One metal shield

• Basic protection against large contaminants

• Useful where relubrication is required on one side

Double Shielded (6204ZZ)

• Shields on both sides

• Better protection against dust and debris

• Retains lubricant longer, extends service life

Rubber Sealed (6204-2RS / 6204DDU / 6204LLU / 6204-2NSE)

• Rubber seals on both sides

• Strong barrier against moisture, dust, and liquids

• Ideal for harsh or contaminated environments

Bearing Code Meaning (6204 Example)

• 6 → Single row deep groove ball bearing

• 2 → Light series

• 04 → Bore code (04 × 5 = 20 mm inner diameter)

For a complete guide, see: How to Read & Identify Bearing Number.

Brand Variations of 6204 Bearing

Applications of 6204 Bearing

6204 bearings are used across multiple industries, including:

• Automotive: Wheel hubs, alternators, transmissions

• Electric Motors: Fans, pumps, compressors

• Agricultural Machinery: Harvesters, tractors

• Industrial Equipment: Conveyors, gearboxes, power tools

• Household Appliances: Washing machines, dryers, vacuum cleaners

Their combination of compact size, reliability, and cost-effectiveness makes them a global standard.

Selecting the Right 6204 Bearing

When choosing a 6204 bearing, consider:

1. Operating environment – Dusty, wet, or clean conditions

2. Load type – Primarily radial vs. combined axial loads

3. Speed requirements – Open type for high speed, sealed type for harsh conditions

4. Material needs – Standard steel vs. stainless steel (W6204)

5. Maintenance frequency – Shielded types retain grease longer

Conclusion

The 6204 bearing offers an excellent balance of performance, availability, and durability. Whether used in industrial machinery, automotive systems, or home appliances, this bearing remains one of the most trusted components in global engineering. Selecting the right seal type and brand variant ensures optimal performance and service life.