What are the dimensions of this bearing?

This ball bearing has an inside diameter of 20 mm, an outside diameter of 52 mm, and a width of 21 mm.

What is the benefit of a double row deep groove ball bearing?

With two rows of balls, it provides a significantly higher load carrying capacity for combined radial and axial loads than single-row bearings.

Is the SKF 4304 ATN9 sealed?

No, this is an open bearing without built-in seals.

What does the suffix TN9 signify?

The TN9 suffix indicates a cage made of glass-fibre reinforced polyamide (plastic).

What internal clearance does this bearing have?

This bearing features standard normal radial internal clearance (class CN).

SKF 4304 ATN9 double-row groove ball bearing cylindrical 20x52x21 mm

Supplier number: SKF 4304 ATN9 | EAN 7316577004567

Recommended Retail Price €106.47

52.60 tax incl.

€43.47 excl. VAT (incl. all environmental contributions)

On stock - immediately available | we have 3 products in stock.

Ordered before 20:00 - delivered tomorrow 16/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

↓ Documents (1) ✆ Talk to a specialist

Smooth rotation with Skf

Practical benefits

High combined load capacity: The double-row design ensures you can easily accommodate heavy radial and axial loads in both directions.
Lightweight polyamide cage: The reinforced polymer cage reduces internal friction so you achieve smooth operation at high rotational speeds.
Robust bearing steel: Crafted from durable bearing steel, it provides dependable structural integrity and long service life in industrial machinery.

In a nutshell

The right choise for

Equip your industrial machinery, pumps, and electric motors with the Skf 4304 ATN9 double-row deep groove ball bearing for dependable power transmission. Engineered with two rows of balls, it reliably supports higher combined radial and axial loads in both directions compared to a single-row bearing. The lightweight polyamide cage (TN9) reduces internal friction and operating noise, promoting smooth rotation at high speeds. Built from durable bearing steel with a 20 mm cylindrical bore, this open bearing delivers robust performance and long-lasting stability in clean, enclosed lubrication environments.

Product information FAQ

€52.60

In stock - tax incl.

Key features according to our expert

Inner diameter: 20 mm
Width: 21 mm
Number of rows: 2
Sealing (bearing): Without seals
Material (bearing seal): Not applicable
Radial clearance: CN (Normal)
Material (bearing): Steel
Material (cage): Plastic
Bore type: Cylindrical
High temperature: No
Outer diameter: 52 mm

Product description

Double row deep groove ball bearings correspond, in their design and operation, to a pair of single row deep groove ball bearings. They are robust in operation, requiring little maintenance, can operate at high speeds and accommodate radial and axial loads in both directions. They are slightly wider than single row bearings of the same bore and outside diameter but have a considerably higher load carrying capacity.

Versatile and robust design
High-speed capability
Accommodate high axial and radial loads in both directions
Require little maintenance

Documents

⤓ Technical data sheet PDF

All Features

Inner diameter: 20 mm
Width: 21 mm
Number of rows: 2
Sealing (bearing): Without seals
Material (bearing seal): Not applicable
Radial clearance: CN (Normal)
Material (bearing): Steel
Material (cage): Plastic
Bore type: Cylindrical
High temperature: No
Outer diameter: 52 mm
Matched arrangement: No
Tolerance class: Normal
Radial internal clearance: CN
Basic static load rating: 16
Material, bearing: Bearing steel
Relubrication feature: Without
Reference speed: 22000
Lubricant: None
Cage: Non-metallic
Locating feature, bearing outer ring: None
Filling slots: Without
Coating: Without
Sealing: Without
Limiting speed: 12000
Bore diameter: 20
Basic dynamic load rating: 23.4
Outer diameter: 52

Brand SKF
01020023
EAN 7316577004567
Supplier number SKF 4304 ATN9

Frequently asked questions about this product

Answered by specialists

What are the dimensions of this bearing?: This ball bearing has an inside diameter of 20 mm, an outside diameter of 52 mm, and a width of 21 mm.
What is the benefit of a double row deep groove ball bearing?: With two rows of balls, it provides a significantly higher load carrying capacity for combined radial and axial loads than single-row bearings.
Is the SKF 4304 ATN9 sealed?: No, this is an open bearing without built-in seals.
What does the suffix TN9 signify?: The TN9 suffix indicates a cage made of glass-fibre reinforced polyamide (plastic).
What internal clearance does this bearing have?: This bearing features standard normal radial internal clearance (class CN).