SKF 1202 ETN9/C3 15x35x11 mm - Self-Aligning Ball Bearing

SKF 1202 ETN9/C3 15x35x11 mm - Self-Aligning Ball Bearing

SKF 1202 ETN9/C3 15x35x11 mm is a double-row self-aligning ball bearing with a cylindrical bore, open design, TN9 polyamide cage and C3 radial internal clearance. Two rows of balls and a common spherical raceway in the outer ring enable the bearing to self-align and accommodate angular misalignment between the shaft and housing.

Technical data

What does SKF 1202 ETN9/C3 mean?

The complete designation 1202 ETN9/C3 identifies the bearing size, internal design, cage and radial internal clearance.

1202 - basic designation of a double-row self-aligning ball bearing from the 12 series with a 15 mm bore.

E - SKF internal bearing design designation.

TN9 - injection-moulded polyamide 66 cage, rolling element centred.

C3 - radial internal clearance greater than Normal.

These designation elements are technically relevant when selecting a replacement bearing.

SKF 1202 ETN9/C3 dimensions

The principal dimensions are:

15x35x11 mm

where:

• d = 15 mm - bore diameter

• D = 35 mm - outside diameter

• B = 11 mm - bearing width

SKF 1202 ETN9/C3 has a cylindrical bore.

It is not a tapered-bore version.

Self-aligning ball bearing construction

SKF 1202 ETN9/C3 has two rows of balls and a common spherical raceway in the outer ring.

Its construction includes:

• inner ring

• outer ring with spherical raceway

• two rows of balls

• TN9 cage

• cylindrical bore

The spherical geometry of the outer-ring raceway allows the inner ring and ball assembly to align relative to the outer ring.

This self-aligning capability is the fundamental constructional difference between a self-aligning ball bearing and a conventional deep groove ball bearing.

Why is SKF 1202 ETN9/C3 self-aligning?

The common spherical raceway in the outer ring enables the bearing to accommodate angular misalignment between the shaft and housing.

Misalignment can result from factors such as:

• shaft deflection

• mounting inaccuracies

• structural deflection

• imperfect housing alignment

This makes self-aligning ball bearings useful in bearing arrangements where maintaining perfect shaft-to-housing alignment is difficult.

This capability does not mean that unlimited misalignment is permissible. The actual permissible angular misalignment is determined by the bearing arrangement and operating conditions.

What does TN9 mean?

The TN9 suffix identifies the cage design.

In SKF nomenclature, TN9 identifies an injection-moulded polyamide 66 cage, rolling element centred.

The cage:

• maintains ball spacing

• guides the rolling elements

• prevents direct contact between adjacent balls

• forms an integral part of the bearing design

TN9 should not automatically be ignored when selecting a technically equivalent replacement, particularly where cage design or operating conditions are important.

What does C3 mean?

The C3 suffix identifies radial internal clearance greater than Normal.

A simplified comparison of clearance classes is:

C2 - smaller than Normal

Normal - normal radial internal clearance

C3 - greater than Normal

C4 - greater than C3

C3 is not a quality or precision grade.

It specifies a range of initial radial internal clearance before the bearing is mounted and reaches operating conditions.

Why is C3 clearance important?

Bearing internal clearance after installation can differ from the initial clearance of the unmounted bearing.

Operating clearance can be affected by:

• inner-ring interference fit

• outer-ring fit

• operating temperature

• temperature differences between bearing rings

• thermal expansion

• operating conditions

SKF 1202 ETN9/C3 should therefore be used where C3 clearance is required by the bearing arrangement.

C3 should not be considered automatically superior to Normal clearance.

Load ratings of SKF 1202 ETN9/C3

SKF specifies:

C = 7.41 kN

Basic dynamic load rating.

C0 = 1.76 kN

Basic static load rating.

Pu = 0.09 kN

Fatigue load limit.

These are SKF catalogue values for this 1202 ETN9 bearing size and design.

Catalogue load ratings alone are not sufficient to determine bearing service life in a specific application. Actual load, rotational speed, lubrication, misalignment and operating conditions must also be considered.

SKF 1202 ETN9/C3 speeds

SKF catalogue data specifies:

Reference speed - 45000 r/min

Limiting speed - 28000 r/min

These are manufacturer catalogue values determined under defined conditions.

They do not mean that every installation using SKF 1202 ETN9/C3 can safely operate at these speeds.

Actual operating capability also depends on:

• load

• lubrication

• operating temperature

• bearing fits

• misalignment

• shaft design

• housing design

SKF 1202 ETN9/C3 vs 1202 ETN9

Both bearings have the same principal dimensions:

15x35x11 mm

and the same basic self-aligning ball bearing construction.

The important difference is radial internal clearance.

1202 ETN9 - Normal radial internal clearance when no special clearance suffix is specified.

1202 ETN9/C3 - radial internal clearance greater than Normal.

A C3 bearing should not automatically be replaced by a Normal-clearance version merely because the mounting dimensions are identical.

SKF 1202 ETN9/C3 vs 1202 K

Bearings in the 1202 family can be available with different bore designs.

SKF 1202 ETN9/C3 has a:

cylindrical bore

In this bearing family, the suffix:

K

identifies a tapered bore.

A tapered-bore bearing can require a different mounting arrangement, including an appropriate adapter sleeve depending on the installation.

Bore design must therefore be verified when selecting a replacement.

SKF 1202 ETN9/C3 vs 6202

SKF 1202 ETN9/C3 and a 6202 deep groove ball bearing can share the same principal dimensions:

15x35x11 mm

but they are fundamentally different bearing designs.

1202 ETN9/C3 - double-row self-aligning ball bearing.

6202 - single-row deep groove ball bearing.

The 1202 design has two rows of balls and a spherical outer-ring raceway that provides self-aligning capability.

A 6202 has different raceway geometry and does not provide the same self-aligning function.

Therefore, matching 15x35x11 mm dimensions do not establish interchangeability.

Radial and axial loads

Self-aligning ball bearings are primarily suitable for radial loads.

Their design also allows them to accommodate axial loads in both directions within the operating limits of this bearing type.

A particularly important characteristic is their ability to accommodate angular misalignment between the shaft and housing.

Actual bearing selection should consider the magnitude and direction of loads in the specific bearing arrangement.

Alternative designations and search references

Natural identification and search references include:

• SKF 1202 ETN9/C3

• 1202 ETN9/C3 SKF

• SKF 1202ETN9/C3

• 1202ETN9/C3 SKF

• SKF 1202 ETN9 C3

• 1202 ETN9 C3 SKF

• SKF 1202 C3

• SKF 1202 15x35x11

• 1202 ETN9/C3 15x35x11

• SKF 1202 self-aligning bearing

• SKF 1202 self-aligning ball bearing

• 1202 C3 self-aligning ball bearing

For technical documentation and precise product identification, the complete manufacturer designation should be used:

1202 ETN9/C3

Selection and interchangeability

Before selecting a replacement, verify:

• manufacturer

• complete designation

• bearing type

• dimensions 15x35x11 mm

• double-row construction

• self-aligning design

• cylindrical bore

• open execution

• TN9 cage

• C3 radial internal clearance

• required load capacity

• rotational speed

• shaft and housing fits

• lubrication

• operating temperature

• permissible misalignment

Matching dimensions alone do not guarantee interchangeability.

A good example is 6202, which can have the same 15x35x11 mm dimensions but uses a fundamentally different bearing design.

Applications

Self-aligning ball bearings are particularly suitable for bearing arrangements where angular misalignment between the shaft and housing or shaft deflection can occur.

Typical applications for this bearing type include:

• transmission shafts

• industrial machinery

• long shaft arrangements

• systems susceptible to angular misalignment

• mechanisms where shaft deflection can occur

These are general applications of self-aligning ball bearings.

They do not confirm that SKF 1202 ETN9/C3 is suitable for a specific machine, motor or piece of equipment without verification against the equipment manufacturer's documentation.

Installation of SKF 1202 ETN9/C3

Before installation:

• clean the shaft and housing

• inspect the mounting surfaces

• verify the required fits

• confirm that C3 clearance is required

• protect the bearing against contamination

Where an interference fit is used, mounting force should be applied directly to the ring being fitted.

Mounting force should not be transmitted through the balls and raceways.

The bearing should be lubricated according to the requirements of the specific bearing arrangement.

Store the bearing in a clean, dry environment and preferably keep it in its original packaging until installation.

FAQ

What are the dimensions of SKF 1202 ETN9/C3?

The bearing measures 15x35x11 mm: 15 mm bore, 35 mm outside diameter and 11 mm width.

What type of bearing is SKF 1202 ETN9/C3?

It is a double-row self-aligning ball bearing with a cylindrical bore.

What does ETN9 mean?

The designation includes the SKF E internal design and TN9 cage. TN9 identifies an injection-moulded polyamide 66 cage, rolling element centred.

What does C3 mean?

C3 identifies radial internal clearance greater than Normal.

Is SKF 1202 ETN9/C3 sealed?

No. It is an open bearing.

Can SKF 1202 ETN9/C3 accommodate misalignment?

Yes. Its two rows of balls and common spherical outer-ring raceway provide self-aligning capability and allow the bearing to accommodate angular misalignment within the limits of its design.

Are SKF 1202 ETN9/C3 and 6202 interchangeable?

This should not be assumed. Both can measure 15x35x11 mm, but 1202 is a double-row self-aligning ball bearing while 6202 is a single-row deep groove ball bearing.

Can 1202 ETN9/C3 be replaced by 1202 ETN9?

Not automatically. The C3 version has greater radial internal clearance than a Normal-clearance bearing. The required clearance class should be determined by the design and operating conditions of the bearing arrangement.

SKF 1202 ETN9/C3 - key information

SKF 1202 ETN9/C3 is an open double-row self-aligning ball bearing measuring 15x35x11 mm, with a cylindrical bore, TN9 polyamide cage and C3 radial internal clearance greater than Normal. Its two rows of balls and spherical outer-ring raceway provide self-aligning capability and accommodate angular misalignment between the shaft and housing.

SKF 1202 ETN9/C3 is available from the specialist industrial supplier simmering.pl, with stock in Poland and worldwide shipping. Assistance with identifying SKF bearings and selecting the correct bearing execution is also available.