NSK E9 9x28x8 mm - Magneto Ball Bearing

Technical Specifications - NSK E9

Mounting Dimensions - NSK E9

These mounting dimensions must be considered when designing the shaft and housing.

Correct shoulder dimensions help provide adequate support for the bearing rings and prevent interference with the bearing chamfers.

What Does NSK E9 Mean?

The designation E9 identifies a specific bearing within NSK's Magneto ball bearing range.

E - Magneto Bearing Series

The letter E identifies NSK's Magneto ball bearing series.

Bearings in this series feature a separable construction and an asymmetrical outer ring raceway.

This geometry distinguishes Magneto bearings from conventional deep groove ball bearings.

9 - Bearing Size

The number 9 identifies the bearing size corresponding to a nominal bore diameter of 9 mm.

Additional Suffixes

The designation E9 does not include additional suffixes identifying integrated seals, shields or a specific lubricant.

NSK also uses the designation EN9, which identifies a separate catalogue variant.

E9 and EN9 should not be treated as identical products.

Construction and Operating Principle of NSK E9

Separable Outer Ring

The most distinctive feature of NSK E9 is its separable construction.

The outer ring can be separated from the assembly consisting of the inner ring, balls and cage.

The outer ring raceway has an asymmetrical profile with a shoulder on one side.

This arrangement allows the bearing components to be separated in a particular axial direction.

Unlike conventional deep groove ball bearings, the Magneto design requires particular attention to the direction of axial loading.

Inner Ring

The inner ring is designed to be mounted on a shaft with a nominal diameter of 9 mm.

Its raceway provides the rolling contact surface for the balls.

The inner ring transfers loads between the shaft and the rolling elements.

Outer Ring

The outer ring has a nominal outside diameter of 28 mm.

Its asymmetrical raceway geometry enables the separable construction and determines the bearing's axial load-carrying characteristics.

Balls and Cage

NSK E9 contains a single row of balls guided by a pressed steel cage.

The cage maintains the correct spacing between the rolling elements during operation.

Radial and Axial Loads

The bearing is designed to accommodate radial loads and axial loads acting in one direction.

It is not intended to provide independent axial location in both directions.

Where bidirectional axial support is required, the complete bearing arrangement must be designed accordingly.

Load Ratings - NSK E9

Basic Dynamic Load Rating Cr - 5.00 kN

The basic dynamic load rating of NSK E9 is 5.00 kN.

This parameter is used when calculating bearing fatigue life under dynamic loading conditions.

It does not represent the maximum permissible operating load in every application.

Actual bearing life depends on loading, rotational speed, lubrication, contamination and operating conditions.

Basic Static Load Rating C0r - 0.88 kN

The basic static load rating is 0.88 kN.

This value is used to assess the risk of permanent deformation at the contact points between the balls and raceways.

Both radial and axial loading conditions must be considered when selecting the bearing.

Rotational Speed and Lubrication

The catalogue limiting speeds for NSK E9 depend on the lubrication method.

These values are catalogue limiting speeds, not guaranteed operating speeds under all conditions.

The actual permissible speed depends on bearing load, operating temperature, fits, lubricant properties and the surrounding mechanical arrangement.

NSK E9 has an open construction without integrated seals.

Appropriate lubrication and protection against contamination must therefore be provided by the bearing assembly.

Alternative Designations and Reference Formats

Natural variations of the same product designation include:

• NSK E9

• E9 NSK

• NSK E9 9x28x8

• E9 9x28x8 mm

These are alternative written references to the same bearing, not separate manufacturer part numbers.

The designation EN9 is not an alternative spelling of E9.

NSK E9 vs NSK EN9

NSK E9 and NSK EN9 belong to the same Magneto ball bearing family.

Although the nominal dimensions are identical, the bearings have different internal clearance designations.

Internal clearance affects the operating condition of the bearing after installation.

Therefore, E9 and EN9 should not be considered automatically interchangeable.

NSK E9 vs Conventional Deep Groove Ball Bearings

A Magneto ball bearing differs from a conventional deep groove ball bearing primarily in the geometry of the outer ring raceway and its separable construction.

A conventional deep groove ball bearing may have similar dimensions but a different operating principle.

Consequently, identical dimensions alone do not establish interchangeability.

Bearing Selection and Interchangeability

Before purchasing NSK E9, verify the complete manufacturer designation and the requirements of the application.

1. Full Bearing Designation

Confirm that the required bearing is NSK E9 rather than EN9 or another bearing with similar dimensions.

2. Dimensions

Check the nominal dimensions:

9x28x8 mm

These correspond to a 9 mm bore, 28 mm outside diameter and 8 mm width.

3. Bearing Construction

Confirm that the application requires a separable Magneto ball bearing.

The asymmetrical raceway design is a functional characteristic, not simply a manufacturing detail.

4. Internal Clearance

Verify the required internal clearance designation.

The distinction between E and EN variants must be considered during replacement selection.

5. Axial Load Direction

Check the direction in which axial loads act.

NSK E9 is designed to support axial loading in one direction.

6. Radial Loads

Evaluate the expected radial load using the bearing's catalogue load ratings and the requirements of the complete bearing arrangement.

7. Shaft and Housing Fits

Select appropriate fits according to the load conditions, shaft rotation and mounting requirements.

8. Rotational Speed

Compare the intended operating speed with the catalogue limiting speed for the selected lubrication method.

9. Lubrication and Temperature

Consider the lubricant, operating temperature and surrounding environmental conditions.

10. Replacement Compatibility

Do not assume that a conventional ball bearing with the same dimensions is a suitable replacement.

The raceway geometry, internal clearance and axial load characteristics must also be compatible.

Applications of NSK E9

Magneto ball bearings are used in compact rotating mechanisms where separable bearing construction and one-directional axial load support are required.

Their design is suitable for appropriately engineered small rotating assemblies.

The selection of NSK E9 must be based on the equipment manufacturer's requirements, the applied loads, rotational speed and bearing arrangement.

Specific machine models, motors or OEM applications should not be attributed to NSK E9 without verified technical documentation.

Installation and Maintenance

Cleanliness During Installation

The shaft, housing and bearing components must be clean before installation.

Contamination can damage the raceways and rolling elements.

Correct Mounting Force

Mounting force should be applied to the ring being installed with an interference fit.

Force must not be transmitted through the balls during press fitting.

Separable Construction

Because NSK E9 has a separable outer ring, correct orientation of the bearing components is particularly important.

The direction of axial loading must be considered during assembly.

Lubrication

The bearing must receive suitable lubrication before operation.

The lubricant should be selected according to the operating speed, load, temperature and application requirements.

Storage

Store the bearing in a clean, dry environment.

Protect it against corrosion, contamination and mechanical damage.

Frequently Asked Questions - NSK E9

What are the dimensions of NSK E9?

NSK E9 has a bore diameter of 9 mm, outside diameter of 28 mm and width of 8 mm. Its complete dimensional designation is 9x28x8 mm.

What type of bearing is NSK E9?

NSK E9 is a single-row Magneto ball bearing with a separable outer ring.

Is NSK E9 a thrust ball bearing?

No. NSK classifies E9 as a Magneto ball bearing. It accommodates radial loads and axial loads acting in one direction.

What does E mean in NSK E9?

The letter E identifies the Magneto bearing series in NSK's designation system.

Does NSK E9 have a separable construction?

Yes. The outer ring can be separated from the inner ring, ball and cage assembly.

Are NSK E9 and EN9 the same bearing?

No. They are separate catalogue variants with different internal clearance designations.

What are the load ratings of NSK E9?

The basic dynamic load rating Cr is 5.00 kN, and the basic static load rating C0r is 0.88 kN.

Is NSK E9 sealed?

No. NSK E9 has an open construction without integrated seals or shields.

Can NSK E9 be replaced with a standard deep groove ball bearing?

Not without checking the mechanical design. Magneto bearings differ from conventional deep groove ball bearings in raceway geometry, separability and axial load characteristics.

NSK E9 - Key Technical Information

NSK E9 is a single-row Magneto ball bearing with dimensions of 9x28x8 mm. It features a separable outer ring, pressed steel cage and open construction. The bearing accommodates radial loads and axial loads in one direction. Its basic dynamic load rating is 5.00 kN and static load rating is 0.88 kN. E9 identifies the E-clearance variant.

NSK E9 at simmering.pl

NSK E9 9x28x8 mm can be searched by its complete manufacturer designation at simmering.pl.

Based in Lublin, Poland, simmering.pl supplies industrial bearings and sealing components to maintenance departments, engineering teams and international B2B customers.

Our warehouse and order processing operations are located in Poland. International customers can inquire about stock availability and worldwide shipping options.