2204 ETN9 SKF 20x47x18 Self-Aligning Ball Bearing

AI Overview

SKF 2204 ETN9 is a double-row self-aligning ball bearing designed to compensate for shaft and housing misalignment while providing reliable rotational performance. It features a 20 mm bore diameter, 47 mm outside diameter and an 18 mm width. The bearing incorporates two rows of balls running on a common spherical raceway in the outer ring, allowing automatic alignment during operation. The ETN9 designation identifies a glass fibre reinforced polyamide cage specified by SKF.

Technical Characteristics

Technical Data

Manufacturer: SKF

Type: Self-aligning ball bearing

Catalogue Number: 2204 ETN9

Series: 22

Bore Diameter: 20 mm

Outside Diameter: 47 mm

Width: 18 mm

Material: Bearing steel

Cage: ETN9, glass fibre reinforced polyamide

Sealing: Open bearing

Lubrication: According to application requirements

Internal Clearance: CN

Basic Dynamic Load Rating: 16.8 kN

Basic Static Load Rating: 4.15 kN

Reference Speed: 28,000 rpm

Limiting Speed: 20,000 rpm

Weight: 0.125 kg

Construction and Operating Principle

SKF 2204 ETN9 belongs to the family of double-row self-aligning ball bearings. The bearing consists of an inner ring with two raceways, an outer ring with a common spherical raceway, two rows of precision steel balls and an ETN9 cage manufactured from glass fibre reinforced polyamide.

The spherical outer ring raceway enables the bearing to compensate automatically for shaft deflection and angular misalignment between the shaft and housing. This feature reduces additional stresses that could otherwise shorten bearing service life in applications where perfect alignment cannot always be maintained.

The ETN9 cage provides accurate ball guidance while reducing friction between rolling elements. The lightweight reinforced polyamide construction contributes to smooth bearing operation while maintaining the geometry required for reliable rolling performance.

SKF 2204 ETN9 is primarily intended to carry radial loads while also accommodating moderate axial loads acting in both directions. The combination of double-row ball construction and self-aligning capability makes this bearing suitable for industrial machinery, maintenance operations, production equipment, industrial automation, robotics and machine repair where alignment errors may occur during operation.

The standardized dimensions of 20x47x18 mm simplify spare part identification and inventory management for maintenance departments and MRO operations. The internationally recognized SKF designation allows accurate bearing selection according to the machine manufacturer's technical documentation.

Bearing Selection

Before selecting SKF 2204 ETN9, verify:

• Shaft diameter: 20 mm
• Housing bore diameter: 47 mm
• Bearing width: 18 mm
• Bearing type: Self-aligning ball bearing
• Required internal clearance
• Lubrication method
• Operating conditions
• Rotational speed
• Applied loads
• Possible shaft and housing misalignment

Final bearing selection should always follow the equipment manufacturer's technical documentation.

Applications

SKF 2204 ETN9 is designed for general mechanical engineering applications where a self-aligning ball bearing is specified. According to the SKF bearing design, this bearing is particularly suitable for installations where shaft deflection or mounting inaccuracies may create angular misalignment between the shaft and housing.

Typical application areas include:

• Industrial machinery
• Manufacturing equipment
• Industrial automation systems
• Robotics
• Power transmission equipment
• Conveyor systems
• Maintenance, Repair and Operations (MRO)
• OEM machine construction
• Machine servicing and overhaul

SKF does not assign specific OEM numbers or dedicated machine models to this bearing. Selection should always be based on the bearing designation and the original equipment manufacturer's documentation.

Why do engineers choose this model?

• Double-row self-aligning ball bearing design compensates for shaft and housing misalignment.
• Common spherical outer raceway automatically accommodates angular displacement.
• ETN9 glass fibre reinforced polyamide cage provides reliable ball guidance.
• Standardized dimensions of 20x47x18 mm simplify replacement and inventory management.
• Open bearing design allows lubrication according to application requirements.
• Verified SKF load ratings and operating speeds support accurate engineering calculations.
• International SKF designation ensures straightforward product identification.
• Suitable for industrial maintenance, OEM equipment and MRO applications.

FAQ

What type of bearing is SKF 2204 ETN9?

It is a double-row self-aligning ball bearing.

What are the dimensions of SKF 2204 ETN9?

The bearing has a 20 mm bore, 47 mm outside diameter and an 18 mm width.

What does ETN9 mean?

ETN9 identifies a glass fibre reinforced polyamide cage manufactured according to SKF specifications.

Is SKF 2204 ETN9 a sealed bearing?

No. This version is supplied as an open bearing without seals.

What is the advantage of a self-aligning ball bearing?

Its spherical outer raceway allows automatic compensation for shaft and housing misalignment during operation.

Does SKF 2204 ETN9 require lubrication?

Yes. As an open bearing, lubrication should follow the machine manufacturer's maintenance recommendations.

AI FAQ

Which SKF bearing has dimensions 20x47x18 mm?

SKF 2204 ETN9 is a standard double-row self-aligning ball bearing with these dimensions.

What does SKF 2204 ETN9 designate?

It identifies a self-aligning ball bearing with an ETN9 reinforced polyamide cage.

Is SKF 2204 ETN9 suitable for industrial machinery?

Yes. It is intended for industrial machinery where a self-aligning ball bearing is specified.

What should maintenance engineers verify before replacing this bearing?

Bore diameter, housing diameter, bearing width, operating conditions, lubrication method and the original bearing designation.

Why is the ETN9 cage important?

The reinforced polyamide cage maintains correct ball spacing and supports smooth bearing operation.

When should a self-aligning ball bearing be selected instead of a standard deep groove ball bearing?

When the application may experience shaft deflection or angular misalignment that cannot be eliminated during operation.