The USSR 6303 Ball Bearing is a metric deep groove ball bearing designed to support rotating shafts while reducing friction between the shaft and stationary housing.

The 6303 series typically uses a single-row deep-groove raceway design, making it suitable primarily for radial loads while also supporting moderate axial loads in both directions under appropriate operating conditions.

Nominal dimensions are:

Bore Diameter: 17 mm

Outside Diameter: 47 mm

Bearing Width: 14 mm

Approximate inch dimensions:

Bore: 0.669 in

Outside Diameter: 1.850 in

Width: 0.551 in

Because the bearing is identified simply as 6303 without an additional suffix such as ZZ, 2RS, C3, or similar, the exact closure arrangement and internal clearance should be verified from the physical bearing or original equipment specification.

A replacement bearing should match not only the basic dimensions but also the operating requirements, including:

• Seal or shield arrangement
• Internal clearance
• Cage design
• Lubrication
• Radial and axial load
• Shaft and housing fit
• Rotational speed
• Operating temperature
• Precision requirement
• Installation environment

⚙️ Applications

• Electric motors
• Industrial pumps
• Gearboxes
• Fans and blowers
• Conveyor systems
• Agricultural machinery
• Mechanical transmissions
• Machine tools
• General rotating machinery
• Legacy industrial equipment

🎯 Benefits

✔ Standard 6303 bearing dimensions

✔ Supports radial loads efficiently

✔ Can support moderate axial loads in both directions

✔ Low-friction rolling-element design

✔ Compact 17 mm bore configuration

✔ Widely used in industrial machinery

✔ Easy to cross-reference with modern 6303-series bearings

✔ Suitable for maintenance and overhaul work

✔ Useful for legacy equipment restoration

🧠 Technical Insight

• USSR 6303 Bearing Reference
• Standard Metric 6303 Series
• Single-Row Deep Groove Ball Bearing
• 17 mm Bore Diameter
• 47 mm Outside Diameter
• 14 mm Width
• Suitable for Radial and Moderate Axial Loads
• Exact Clearance and Closure Type Should Be Verified

✅ Key Features

• USSR / Soviet-Origin Bearing Reference
• 6303 Bearing Series
• Deep Groove Ball Bearing
• Single-Row Construction
• Metric 17x47x14 mm Dimensions
• Industrial Rotary Support
• Legacy Equipment Replacement
• Cross-Reference Support Available

📊 Specifications

Brand / Marking: USSR

Model / Bearing Number: 6303

Bearing Series: 6303

Bearing Type: Single-Row Deep Groove Ball Bearing

Bore Diameter (d): 17 mm

Outside Diameter (D): 47 mm

Width (B): 14 mm

Inch Equivalent: Approximately 0.669 × 1.850 × 0.551 in

Rolling Elements: Ball

Number of Rows: 1

Raceway Type: Deep Groove

Load Capability: Primarily radial load with moderate axial-load capability in both directions

Seal / Shield: Not indicated by the supplied 6303 designation; verify actual bearing

Cage: Verify original bearing or replacement specification

Internal Clearance: Standard clearance cannot be assumed; verify whether Normal, C3, or another clearance is required

Lubrication: Depends on whether the original bearing is open, shielded, or sealed and on the equipment lubrication system

Speed Rating: Depends on manufacturer, closure type, lubrication, load, fit, temperature, and operating conditions

Temperature Range: Depends on bearing steel, lubricant, cage, seals if fitted, and operating environment

Shaft Fit: Select according to shaft rotation, load direction, and operating conditions

Housing Fit: Select according to load, temperature, housing material, and application

Standard: Metric 6303-Series Deep Groove Ball Bearing

🔁 Equivalent

Suitable replacement or cross-reference candidate for compatible:

• 6303 Deep Groove Ball Bearing
• USSR 6303 Bearing
• 17x47x14 Ball Bearing
• 17 mm Bore Ball Bearing
• 6303 Open Bearing
• SKF 6303 Series
• FAG 6303 Series
• NSK 6303 Series
• NTN 6303 Series
• KOYO 6303 Series

The 6303 basic designation and 17 × 47 × 14 mm dimensions provide a strong dimensional cross-reference, but the replacement should still match the required seal/shield configuration, internal clearance, cage, lubrication, precision class, load rating, speed capability, and operating environment.

For example, 6303, 6303-ZZ/2Z, 6303-2RS, and 6303-C3 may share the same nominal dimensions but differ significantly in closure and internal operating characteristics.

(Always verify the original USSR 6303 bearing construction and application requirements before selecting a modern replacement.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for electric motors, pumps, gearboxes, fans, conveyors, agricultural equipment, machine tools, transmission systems, and restoration of legacy industrial machinery.

📲 Contact via LINE ID: dusitrea

📧 Email: sales@seal4go.com

💬 Technical support available before ordering

🔍 Assistance available for cross-reference and equivalent part identification