The MRC (SKF) 304SZZC is a single-row deep groove radial ball bearing designed for industrial equipment requiring a compact 20 mm bore and 52 mm OD while using a much wider bearing section than a conventional 304-series bearing.

Its distinguishing characteristic is the Cartridge-Type construction, with a nominal width of:

22.23 mm / 7/8 inch

For comparison, a standard 304SZZ version may use a width of approximately 15 mm, while the 304SZZC Cartridge-Type execution increases the width to approximately 22.23 mm.

This wider construction is important in machinery where:

• Bearing housing depth is greater than standard
• Shaft shoulders are positioned for a cartridge-width bearing
• Axial location depends on the wider inner/outer ring geometry
• Spacers, retainers, or adjacent components are designed around the original width
• A standard-width replacement would create incorrect axial positioning

The bearing uses single-row deep groove geometry, providing good radial-load capability together with moderate axial-load capability in both directions.

⚙️ Applications

• Industrial electric motors
• Industrial gearboxes
• Pumps
• Fans and blowers
• Conveyor drive systems
• Machine tools
• Mechanical transmissions
• Industrial drive assemblies
• Legacy OEM equipment
• Machinery using cartridge-width bearings

🎯 Benefits

✔ Special 22.23 mm Cartridge Width

✔ Standard 20 mm bore and 52 mm OD

✔ Single-row deep groove ball-bearing construction

✔ Supports radial loads efficiently

✔ Can support moderate axial loads in both directions

✔ Protected closure helps retain lubricant

✔ Suitable for industrial contamination environments

✔ ABEC 1 / ISO Normal precision class

✔ Cross-reference assistance available

🧠 Technical Insight

• MRC 304SZZC Bearing Reference
• Single-Row Deep Groove Radial Ball Bearing
• Cartridge-Type Bearing Construction
• 20 mm Bore
• 52 mm Outside Diameter
• 22.23 mm / 7/8 in Width
• Dynamic Load Rating 15.9 kN
• Static Load Rating 7.8 kN

✅ Key Features

• MRC (SKF) Industrial Bearing
• Model 304SZZC
• Cartridge-Type Design
• Single-Row Deep Groove Raceway
• Extra-Wide 22.23 mm Section
• Protected Double-Side Closure
• ABEC 1 Precision
• Cross-Reference Support Available

📊 Specifications

Brand: MRC (SKF)

Model / Bearing Number: 304SZZC

Basic Bearing Number: 304

Bearing Type: Single-Row Deep Groove Radial Ball Bearing

Bearing Configuration: Cartridge-Type Bearing

Bore Diameter (d): 20.000 mm

Outside Diameter (D): 52.000 mm

Width (B): 22.23 mm

Width in Inches: 7/8 in / approximately 0.875 in

Approx. Inch Dimensions: 0.787 × 2.047 × 0.875 in

Rolling Elements: Ball

Number of Rows: 1

Raceway Type: Deep Groove

Section Type: Cartridge Width / Extra-Wide

Suffix S: Single-row deep groove radial bearing execution

Suffix ZZ: Protected / double-side closure designation

Suffix C: Cartridge-Type / extra-width execution

Closure Type: The supplied technical references describe the ZZC configuration as a protected double-side closure using shield/seal elements for contamination protection and grease retention. Because historical MRC suffix usage can vary, the exact shield/seal construction should be confirmed from the actual bearing or original MRC drawing where critical.

Basic Dynamic Radial Load Rating (C): 15,900 N / 15.9 kN

Basic Static Radial Load Rating (C₀): 7,800 N / 7.8 kN

Precision Rating: ABEC 1

ISO Precision Class: Normal

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

Lubrication: Protected bearing configuration designed to retain grease internally; verify actual lubricant specification for the application

Internal Clearance: Verify original MRC 304SZZC specification

Speed Rating: Depends on closure design, lubrication, clearance, cage, load, fit, and operating temperature

Temperature Range: Depends on lubricant, closure material, cage, fit, and operating conditions

Shaft Fit: Nominal 20 mm shaft; verify shaft tolerance and interference

Housing Fit: Nominal 52 mm housing bore; verify housing tolerance and shoulder geometry

Installation Consideration: The 22.23 mm cartridge width must match the original housing depth, shaft shoulders, retaining arrangement, and axial space

Standard: Manufacturer-Specific MRC Cartridge-Type Deep Groove Bearing

🔁 Equivalent

Suitable replacement or cross-reference candidate for compatible:

• MRC 304SZZC
• MRC 304 SZZC
• 20x52x22.23 mm Deep Groove Ball Bearing
• 20x52x7/8 in Cartridge Bearing
• Cartridge-Type 304 Bearing
• Extra-Wide 20 mm Bore Ball Bearing
• Protected Cartridge Ball Bearing
• 52 mm OD Industrial Bearing
• Legacy MRC 304 Series Bearing
• Industrial Cartridge-Type Deep Groove Bearing

A standard-width bearing should not automatically be considered a direct replacement simply because the bore and outside diameter are the same.

For example, the supplied reference distinguishes:

MRC 304SZZC: approximately 20 × 52 × 22.23 mm

versus a standard-width 304SZZ: approximately 20 × 52 × 15 mm

The difference in width is approximately:

7.23 mm

That difference affects:

• Shaft shoulder position
• Housing depth
• Spacer location
• Axial retention
• End play
• Adjacent gear or pulley location
• Overall assembly geometry

The replacement should also match the closure arrangement, internal clearance, precision class, lubrication, load rating, cage, shaft fit, housing fit, and operating environment.

(Always verify the original MRC 304SZZC dimensions and machine mounting arrangement before selecting another bearing.)

📦 Availability

✅ In Stock

🚚 Fast Delivery Available

🌎 Worldwide Shipping Available

📦 MOQ: 1 Piece

🏭 Suitable for motors, gearboxes, pumps, conveyors, fans, machine tools, mechanical drives, industrial machinery, and legacy OEM equipment designed around a 20 × 52 × 22.23 mm cartridge-width bearing.

📲 Contact via LINE ID: dusitrea

📧 Email: sales@seal4go.com

💬 Technical support available before ordering

🔍 Assistance available for cross-reference and equivalent part identification