SKF 6205-2Z/C3 25x52x15 mm - Deep Groove Ball Bearing

SKF 6205-2Z/C3 25x52x15 mm - Deep Groove Ball Bearing

SKF 6205-2Z/C3 is a single-row deep groove ball bearing with dimensions 25x52x15 mm, fitted with metal shields on both sides. The suffix 2Z identifies two non-contact shields, while C3 indicates radial internal clearance greater than Normal. The bearing has a cylindrical bore, a sheet steel cage and is factory filled with grease.

Technical Specifications - SKF 6205-2Z/C3

Dimensions of SKF 6205-2Z/C3

The principal dimensions are:

25x52x15 mm

where:

d = 25 mm - bore diameter

D = 52 mm - outside diameter

B = 15 mm - bearing width

SKF 6205-2Z/C3 has a cylindrical bore.

Dimensions are an important part of bearing identification, but they should not be the only criterion when selecting a replacement. The 2Z shields, C3 internal clearance and operating requirements of the specific bearing arrangement must also be checked.

What Does SKF 6205-2Z/C3 Mean?

The complete manufacturer designation is:

SKF 6205-2Z/C3

Each part of this designation has a specific technical meaning.

6205

6205 is the basic designation of this single-row deep groove ball bearing.

The bearing belongs to the 62 dimension series.

The bore code 05 corresponds to:

d = 25 mm

The principal dimensions are:

25x52x15 mm

2Z

2Z identifies metal shields on both sides of the bearing.

The Z shields are non-contacting.

Their purpose is to help retain lubricant inside the bearing while limiting the ingress of larger contaminants into the bearing interior.

Because the shields do not operate with sealing lip contact, they generate very little additional friction. This is particularly important in applications requiring relatively high rotational speeds.

C3

C3 means that the radial internal clearance is greater than Normal.

C3 is not a quality grade and does not indicate a higher accuracy class.

Greater internal clearance can be required when the operating clearance is reduced by interference fits, temperature differences or other operating conditions.

C3 should therefore not automatically be considered better than Normal clearance.

The correct clearance class must be selected according to the requirements of the bearing arrangement.

Is SKF 6205 ZZ C3 the Same as SKF 6205-2Z/C3?

6205 ZZ C3 is a widely used commercial description for a 6205 bearing with metal shields on both sides and C3 internal clearance.

In SKF nomenclature, the correct designation for this configuration is:

6205-2Z/C3

For this reason, 6205 ZZ C3 is useful as a natural commercial and search reference, while the product title, technical specification and ordering reference should use the precise SKF designation:

SKF 6205-2Z/C3

Construction of SKF 6205-2Z/C3

SKF 6205-2Z/C3 is a single-row deep groove ball bearing.

Its construction includes:

inner ring

outer ring

balls

sheet steel cage

two metal Z shields

factory-applied grease

The deep raceway geometry allows the bearing to accommodate primarily radial loads together with axial loads acting in both directions within the operating limits of this bearing design.

2Z Metal Shields

SKF 6205-2Z/C3 has metal shields on both sides.

The designation:

2Z

means two Z shields.

These shields do not operate in the same way as contacting elastomer seals. They are a non-contact design.

This results in very low additional friction and makes shielded deep groove ball bearings suitable for relatively high rotational speeds.

However, their protection against moisture and fine contaminants differs from the protection provided by contacting seals used in 2RS-type configurations.

C3 Radial Internal Clearance

SKF 6205-2Z/C3 has:

C3 radial internal clearance

which means clearance greater than Normal.

Bearing internal clearance can decrease after installation, particularly when one or both rings are mounted with interference fits.

Operating temperature can also affect clearance.

If the inner ring operates at a higher temperature than the outer ring, differential thermal expansion can further reduce the operating clearance.

C3 is therefore selected for specific mounting and operating conditions.

It should not be selected solely because it is perceived as a higher specification than Normal clearance.

Load Ratings of SKF 6205-2Z/C3

SKF specifies for this bearing size and design:

C = 14.8 kN - basic dynamic load rating

C0 = 7.8 kN - basic static load rating

Pu = 0.335 kN - fatigue load limit

These are catalogue parameters used for bearing selection and life calculations.

The basic dynamic load rating of 14.8 kN should not be interpreted as a simple maximum permissible load for a machine.

Actual bearing life depends on operating load, speed, lubrication, temperature, contamination, fits and required service life.

Speed Ratings

SKF catalogue data for the 6205-2Z design specify:

Reference speed = 28,000 r/min

Limiting speed = 14,000 r/min

The ability to operate at relatively high speed is supported by the non-contact nature of the Z shields.

Actual permissible operating speed in a specific application also depends on load, lubrication, temperature, fits and heat dissipation.

SKF 6205-2Z/C3 vs SKF 6205-2Z

Both variants have:

dimensions 25x52x15 mm

metal shields on both sides

single-row deep groove ball bearing construction

The important difference is radial internal clearance.

SKF 6205-2Z has Normal internal clearance in its standard configuration.

SKF 6205-2Z/C3 has radial internal clearance greater than Normal.

The two versions should therefore not be interchanged solely because their dimensions are identical.

SKF 6205-2Z/C3 vs SKF 6205-2RS1/C3

Both versions may have the same principal dimensions:

25x52x15 mm

and both may have C3 internal clearance.

However, their closure systems are different.

2Z identifies non-contact metal shields.

2RS1 identifies contact seals on both sides.

Metal shields produce very low additional friction and support higher-speed operation, while contact seals provide different protection against contaminants.

The correct configuration should therefore be selected according to operating conditions.

SKF 6205-2Z/C3 vs Open SKF 6205/C3

An open SKF 6205/C3 does not have the metal shields used in the 2Z version.

This affects:

protection against contamination

lubricant retention

lubrication arrangement

maintenance possibilities

operating characteristics

The same 25x52x15 mm dimensions therefore do not make open and shielded variants technically identical.

Alternative Designations and Search References

Natural reference variants include:

SKF 6205-2Z/C3

6205-2Z/C3 SKF

SKF6205-2Z/C3

SKF 6205 2Z C3

6205 2Z C3 SKF

Common commercial search references also include:

SKF 6205 ZZ C3

6205 ZZ C3 SKF

SKF 6205 ZZ C3 25x52x15

6205 ZZ C3 25x52x15

The designation ZZ is widely used in the bearing market to describe metal shields on both sides.

For precise identification of this SKF product, however, the manufacturer's official designation should be retained:

SKF 6205-2Z/C3

Selection and Interchangeability

Before selecting SKF 6205-2Z/C3 or an alternative bearing, verify:

• full designation SKF 6205-2Z/C3
• single-row deep groove ball bearing design
• bore diameter d = 25 mm
• outside diameter D = 52 mm
• width B = 15 mm
• metal shields on both sides
• non-contact shield design
• C3 radial internal clearance
• required radial load
• required axial load
• rotational speed
• operating temperature
• shaft fit
• housing fit
• lubrication conditions
• contamination level
• requirements of the specific bearing arrangement

Identical dimensions of 25x52x15 mm do not automatically establish complete technical interchangeability.

Typical Applications

Single-row deep groove ball bearings are widely used in rotating bearing arrangements requiring low friction, relatively high rotational speeds and the ability to accommodate radial loads together with axial loads within the capabilities of the bearing design.

The 2Z configuration is particularly useful where lubricant retention and low shield friction are required.

The C3 version is relevant where mounting conditions, temperature or other operating factors require radial internal clearance greater than Normal.

However, the exact SKF 6205-2Z/C3 reference should not be assigned to a specific electric motor, gearbox, machine, vehicle or other equipment unless confirmed by OEM or equipment manufacturer documentation.

Installation and Operation

SKF 6205-2Z/C3 should be installed under clean conditions.

Before installation, inspect the shaft, housing and bearing seats.

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

When mounting the bearing onto a shaft, force should not be transmitted through the balls to the outer ring.

When pressing the bearing into a housing, force should not be transmitted through the balls to the inner ring.

Do not strike the bearing directly.

The 2Z metal shields should be protected against deformation and mechanical damage during handling and installation.

The bearing should be stored in a clean and dry environment, preferably in its original packaging until installation.

FAQ - SKF 6205-2Z/C3

What are the dimensions of SKF 6205-2Z/C3?

SKF 6205-2Z/C3 has dimensions of 25x52x15 mm: d = 25 mm, D = 52 mm and B = 15 mm.

What does 2Z mean in SKF 6205-2Z/C3?

2Z means that the bearing has metal shields on both sides. SKF Z shields are non-contacting.

What does C3 mean?

C3 means radial internal clearance greater than Normal. It is an internal clearance class, not a quality or accuracy grade.

Are SKF 6205 ZZ C3 and SKF 6205-2Z/C3 the same product?

6205 ZZ C3 is a common commercial way of describing this configuration. The precise SKF designation is 6205-2Z/C3.

Is SKF 6205-2Z/C3 factory lubricated?

Yes. The shielded bearing is supplied with grease inside the bearing.

Are SKF 6205-2Z/C3 and SKF 6205-2Z identical?

No. They have the same principal dimensions and shields, but differ in radial internal clearance. The /C3 version has clearance greater than Normal.

What are the load ratings of SKF 6205-2Z/C3?

SKF specifies a basic dynamic load rating C of 14.8 kN, a basic static load rating C0 of 7.8 kN and a fatigue load limit Pu of 0.335 kN.

Can SKF 6205-2RS1/C3 replace SKF 6205-2Z/C3?

Not automatically. 2RS1 uses contact seals, while 2Z uses non-contact metal shields. This affects sealing performance, friction and permissible operating speed.

SKF 6205-2Z/C3 - Key Information

SKF 6205-2Z/C3 is a single-row deep groove ball bearing measuring 25x52x15 mm with non-contact metal shields on both sides and C3 radial internal clearance greater than Normal. It has a sheet steel cage and factory grease filling. SKF specifies C = 14.8 kN, C0 = 7.8 kN and Pu = 0.335 kN.

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