SKF 6305 2RS C4 25x62x17 mm

SKF 6305 2RS C4 25x62x17 mm - Single-Row Deep Groove Ball Bearing

SKF 6305 2RS C4 is a single-row deep groove ball bearing with dimensions of 25x62x17 mm, double-sided elastomer sealing and C4 radial internal clearance. Manufactured by SKF, it belongs to the 63 bearing series and is designed to accommodate primarily radial loads and permissible axial loads in both directions. C4 clearance is greater than C3, while the commercial designation 2RS requires confirmation of the exact SKF seal execution.

Technical Specifications - SKF 6305 2RS C4

These specifications identify the bearing construction indicated by the commercial designation. The exact seal design, cage execution, lubricant and operating parameters must be verified against the manufacturer's complete product designation.

What Does SKF 6305 2RS C4 Mean?

The designation identifies the manufacturer, bearing type, dimensional series, bore diameter, sealing arrangement and radial internal clearance.

SKF - Bearing manufacturer.

6 - Single-row deep groove ball bearing.

63 - Bearing dimensional series.

05 - Bore code corresponding to a nominal bore diameter of 25 mm.

2RS - Common commercial designation indicating two rubber or elastomer seals positioned on opposite sides of the bearing.

C4 - Radial internal clearance greater than C3.

What Is the Correct SKF Designation?

The designation 6305 2RS C4 is widely understood in the bearing trade, but it does not unambiguously identify the exact SKF sealing execution.

Depending on the specific product, SKF may use more detailed sealing suffixes, such as 2RS1 or 2RSH.

An example of a complete SKF designation format is:

6305-2RS1/C4

However, this must not be treated as the confirmed catalogue designation of the offered bearing without checking the packaging, bearing markings or manufacturer documentation.

SKF 6305 2RS C4 Dimensions

The principal mounting dimensions are:

• Bore diameter d: 25 mm.

• Outside diameter D: 62 mm.

• Width B: 17 mm.

Bearing dimensions: 25x62x17 mm.

The 25 mm bore corresponds to the nominal shaft diameter.

The 62 mm outside diameter determines the nominal housing bore size.

The 17 mm width must be considered when positioning the bearing axially within the assembly.

Dimensions of 25x62x17 mm are shared by several 6305 bearing variants. Matching dimensions alone therefore do not establish complete interchangeability.

Construction of SKF 6305 2RS C4

The bearing belongs to the family of single-row deep groove ball bearings.

Its principal components include:

• Inner ring with a deep groove raceway.

• Outer ring with a deep groove raceway.

• One row of balls.

• Cage maintaining the spacing between the rolling elements.

• Two seals positioned on opposite sides of the bearing.

The deep groove raceway geometry enables the bearing to accommodate radial loads and specified axial loads in both directions.

The seals help limit the entry of contaminants and retain lubricant inside the bearing.

The bearing has a non-separable construction.

2RS Sealing - Design and Characteristics

The commercial designation 2RS indicates two elastomer seals.

Their principal functions are:

• Limiting the entry of dust and other contaminants.

• Helping retain grease within the bearing.

• Protecting the raceways and rolling elements during operation.

Compared with an open bearing, a sealed execution provides additional protection for the internal components.

Contact seals also introduce additional friction.

The exact seal geometry and performance characteristics depend on the specific SKF execution.

Sealing does not mean that the bearing is completely resistant to pressurised water, aggressive chemicals or every type of contamination.

C4 Radial Internal Clearance - What Does It Mean?

C4 identifies a radial internal clearance class greater than C3.

Radial internal clearance describes the relative radial displacement possible between the bearing rings before mounting, under specified measurement conditions.

The principal clearance classes are:

Why Is C4 Clearance Used?

Bearing internal clearance may decrease during mounting and operation.

The principal influencing factors include:

• Interference fit between the inner ring and shaft.

• Fit between the outer ring and housing.

• Temperature differences between the bearing rings.

• Deformation associated with operating loads.

Greater initial clearance may be necessary in certain mounting arrangements and operating conditions.

However, this does not mean that C4 is suitable for every electric motor or industrial machine.

Does C4 Indicate Higher Bearing Quality?

No.

C4 is a radial internal clearance designation, not a bearing quality grade, precision class or indication of longer service life.

Incorrect clearance selection can adversely affect bearing operation, even when the selected clearance is greater than Normal.

Radial and Axial Load Accommodation

SKF 6305 2RS C4 is primarily intended to accommodate radial loads.

Its deep groove ball bearing construction also enables it to support permissible axial loads in both directions.

Correct bearing selection requires consideration of:

• Radial load magnitude.

• Axial load magnitude.

• Direction of applied forces.

• Rotational speed.

• Operating temperature.

• Lubrication conditions.

• Shaft and housing fits.

• Required operating clearance.

• Calculated bearing life.

A standard deep groove ball bearing is not designed to compensate for substantial angular misalignment between the shaft and housing.

SKF 6305 2RS C4 vs Other Bearing Variants

SKF 6305 2RS C4 vs SKF 6305 2RS C3

Both variants have dimensions of 25x62x17 mm and double-sided sealing according to their commercial designations.

They differ in radial internal clearance.

6305 2RS C3 - Clearance greater than Normal.

6305 2RS C4 - Clearance greater than C3.

Substitution requires verification of mounting fits and thermal operating conditions.

SKF 6305 2RS C4 vs SKF 6305/C4

Both executions have dimensions of 25x62x17 mm and C4 radial internal clearance.

6305 2RS C4 - Double-sided sealed execution.

SKF 6305/C4 - Open execution.

The principal differences concern contamination protection and lubrication arrangements.

SKF 6305 2RS C4 vs SKF 6305-2Z/C3

Both variants have identical principal dimensions.

6305 2RS C4 - Elastomer seals and C4 radial internal clearance.

6305-2Z/C3 - Two non-contact metal shields and C3 radial internal clearance.

The differences concern both the closure design and the internal clearance class.

SKF 6305 2RS C4 vs SKF 6305

The standard SKF 6305 bearing has dimensions of 25x62x17 mm, an open design and Normal radial internal clearance, CN.

The 6305 2RS C4 variant has double-sided sealing and greater radial internal clearance.

These executions must not be considered automatically interchangeable.

Bearing Selection and Interchangeability

Before purchasing or replacing the bearing, verify:

• Complete SKF designation.

• Dimensions 25x62x17 mm.

• Exact seal type.

• C4 radial internal clearance.

• Required dynamic and static load ratings.

• Permissible rotational speed.

• Lubrication conditions.

• Operating temperature.

• Shaft and housing fits.

• Required bearing service life.

It is particularly important to confirm that the application actually requires C4 radial internal clearance.

Dimensional compatibility alone is not sufficient for correct bearing selection.

Typical Applications of 6305 Series Bearings

Double-sealed, single-row deep groove ball bearings can be used in rotating assemblies where additional protection against contamination is required.

Typical applications of this bearing design include:

• Industrial machinery drive systems.

• Rotating mechanical assemblies.

• Gearbox assemblies.

• Production equipment.

• Electric motors requiring an appropriately selected clearance class.

• Shafts and mechanical assemblies operating under specified thermal conditions.

These are general applications associated with the bearing design, not confirmed original equipment applications for this specific product number.

Mounting and Operation

Before installation, inspect the shaft, housing and bearing seating surfaces.

Verify the required fits and alignment.

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

Force must not be transmitted through the balls and raceways.

Protect the seals against mechanical damage during installation.

Do not remove the seals or add grease without checking the manufacturer's recommendations and the operating conditions.

Store the bearing in its original packaging in a clean, dry environment.

FAQ

What are the dimensions of SKF 6305 2RS C4?

The bearing measures 25x62x17 mm. The bore diameter is 25 mm, the outside diameter is 62 mm and the width is 17 mm.

What does 2RS mean?

2RS is a common commercial designation for two elastomer seals. The exact SKF sealing execution must be confirmed using the complete manufacturer designation.

What does C4 mean?

C4 indicates radial internal clearance greater than C3.

Is C4 clearance greater than C3?

Yes. C4 represents a greater radial internal clearance range than C3.

Is SKF 6305 2RS C4 a sealed bearing?

Yes. According to the supplied commercial designation, 2RS indicates a bearing with seals on both sides.

Can a 6305 C3 bearing be replaced with a 6305 C4?

Not automatically. The variants differ in radial internal clearance. Substitution requires evaluation of mounting and operating conditions.

Do 6305 2RS C4 and 6305-2Z/C3 have the same dimensions?

Yes. Both variants measure 25x62x17 mm, but they differ in closure design and radial internal clearance.

Can SKF 6305 2RS C4 accommodate axial loads?

Yes. Its deep groove ball bearing construction enables it to accommodate permissible axial loads in both directions.

SKF 6305 2RS C4 - Key Information

SKF 6305 2RS C4 is a single-row deep groove ball bearing measuring 25x62x17 mm, with double-sided elastomer sealing and C4 radial internal clearance, greater than C3. It accommodates radial loads and permissible axial loads in both directions. The exact SKF seal execution must be confirmed using the complete manufacturer designation.

SKF 6305 series bearings are offered by the specialist industrial bearing supplier simmering.pl. Stock in Poland, worldwide shipping and technical assistance with identifying the correct bearing execution.