SKF 629/C3 9x26x8 mm - Deep Groove Ball Bearing

629/C3 SKF 9x26x8 mm - Single Row Deep Groove Ball Bearing

SKF 629/C3 is a single row deep groove ball bearing with dimensions of 9x26x8 mm, belonging to the 62 dimensional series. It is an open radial ball bearing with one row of balls, designed to accommodate radial loads and axial loads in both directions. The C3 suffix indicates radial internal clearance greater than normal (CN). The absence of a seal or shield suffix identifies the basic open bearing design.

Technical Specifications - SKF 629/C3

Load ratings, speed limits, mass and other execution-specific parameters must be verified for the exact SKF 629/C3 bearing. Values from shielded, sealed or normal-clearance variants should not automatically be transferred to this product.

What Does SKF 629/C3 Mean?

629 - Basic Bearing Designation

The designation 629 identifies a single row deep groove ball bearing with dimensions of 9x26x8 mm.

The bearing consists of an inner ring, an outer ring and a single row of balls running in deep raceway grooves.

The designation belongs to the 62 dimensional series.

The nominal bore diameter is 9 mm. It should not be calculated using the bore-code multiplication rules applicable to larger bearing sizes.

C3 - Increased Radial Internal Clearance

The suffix C3 indicates radial internal clearance greater than normal.

Radial internal clearance describes the permissible radial displacement of one bearing ring relative to the other before installation, under the applicable measurement conditions.

Common radial internal clearance groups include:

• C2 - Clearance smaller than normal.

• CN - Normal radial internal clearance.

• C3 - Clearance greater than normal.

• C4 - Clearance greater than C3.

• C5 - Clearance greater than C4.

C3 clearance may be required when interference fits or thermal operating conditions reduce the bearing's internal clearance after installation.

C3 does not indicate an increased load rating, a higher accuracy class or a special bearing material.

Open Bearing Design

The designation 629/C3 does not contain a suffix specifying metal shields or elastomeric contact seals.

It therefore identifies the basic open bearing configuration.

An open bearing allows the lubrication system to be selected according to the machine design, including grease or oil lubrication.

However, the surrounding assembly must provide suitable protection against contamination and moisture.

Construction and Operating Principle of SKF 629/C3

Inner and Outer Rings

The bearing has an inner ring with a cylindrical bore diameter of 9 mm and an outer ring with an outside diameter of 26 mm.

Both rings incorporate deep raceway grooves designed to accommodate the rolling elements.

The overall bearing width is 8 mm.

The raceway geometry enables the bearing to support radial loads and axial loads acting in either direction.

Balls and Cage

A single row of steel balls is positioned between the inner and outer rings.

A pressed steel cage separates and guides the rolling elements, maintaining their circumferential spacing during operation.

This cage construction is associated with the specified SKF bearing configuration.

Open Construction

SKF 629/C3 does not have integrated metal shields or contact seals.

The open design allows the bearing to operate with an appropriately engineered grease or oil lubrication system.

However, the bearing must be protected from contamination by the surrounding housing or sealing arrangement.

Load Transmission

The bearing is primarily designed to accommodate radial loads.

It can also support axial loads in both directions, within the permissible limits of the bearing design and operating conditions.

SKF 629/C3 is not a thrust ball bearing or an angular contact ball bearing.

Load Ratings and Operating Parameters

The following technical values are associated with the SKF 629/C3 configuration in catalogue and distributor information.

Basic load ratings are catalogue parameters used in bearing selection and service life calculations. They are not universal permissible working loads independent of application conditions.

Likewise, the limiting speed does not mean that every installation can operate continuously at that speed.

Actual operating limits depend on lubrication, load, temperature, mounting conditions and the surrounding mechanical assembly.

Alternative Designations and Reference Numbers

Natural variations of the product designation include:

• SKF 629/C3

• 629/C3 SKF

• 629 C3 SKF

• SKF 629 C3

• SKF629/C3

The designation 629 C3 is commonly used in commercial product listings.

The SKF catalogue-style designation uses a separator before the C3 suffix: 629/C3.

This product should not automatically be considered equivalent to SKF 629-2Z/C3 or SKF 629-2RSH/C3, because these variants have different protective arrangements.

SKF 629/C3 vs Other SKF 629 Variants

These bearing variants may share the same dimensions of 9x26x8 mm while differing in internal clearance, sealing arrangements, lubrication requirements and operating characteristics.

They are not automatically interchangeable.

SKF 629/C3 vs SKF 629

The principal difference is radial internal clearance.

SKF 629/C3 has greater initial radial internal clearance than the standard SKF 629 bearing with normal clearance.

Replacing one variant with the other requires verification of bearing fits, operating temperature and the required operating clearance.

SKF 629/C3 vs SKF 629-2Z/C3

Both variants belong to the same dimensional family and specify C3 radial internal clearance.

However, SKF 629/C3 is an open bearing, whereas SKF 629-2Z/C3 incorporates metal shields on both sides.

Metal shields help reduce the entry of larger contaminants but are not equivalent to contact seals.

The difference may affect lubrication arrangements and suitability for the application.

Bearing Selection and Interchangeability

Before ordering SKF 629/C3, verify the following requirements:

• Complete bearing designation SKF 629/C3.

• Shaft diameter of 9 mm.

• Housing bore diameter of 26 mm.

• Available installation width of 8 mm.

• Required C3 radial internal clearance.

• Open bearing construction.

• Inner and outer ring fits.

• Radial and axial loading conditions.

• Operating speed.

• Operating temperature.

• Lubrication method.

• Protection against dust, moisture and contamination.

Identical dimensions do not necessarily mean full interchangeability.

In particular, replacing SKF 629/C3 with a normal-clearance bearing should not be considered without checking the application's operating clearance requirements.

Applications of SKF 629/C3

Based on its single row deep groove ball bearing construction, SKF 629/C3 may be considered for compact rotating assemblies requiring dimensions of 9x26x8 mm and C3 radial internal clearance.

Typical applications for this type of bearing include:

• Small rotating shaft assemblies.

• Industrial machinery mechanisms.

• Compact drive systems.

• Small mechanical assemblies.

• Radial shaft support arrangements.

• Mechanisms subject to radial and bidirectional axial loads.

These are general applications associated with the bearing design.

They are not verified OEM applications for the specific SKF 629/C3 product.

Suitability must be determined from the operating requirements of the individual machine or mechanical assembly.

Installation and Operating Recommendations

Cleanliness During Installation

Clean the shaft, housing and mating surfaces before installation.

Because the bearing has an open design, protecting its internal components from contamination is particularly important.

Correct Bearing Fits

Shaft and housing fits should be selected according to the load characteristics and operating conditions.

Excessive interference may significantly reduce radial internal clearance.

Applying Mounting Force

When mounting the bearing onto a shaft, apply the installation force to the inner ring.

When pressing the bearing into a housing, apply the force to the outer ring.

Mounting forces must not be transmitted through the balls and raceways.

Lubrication

The open bearing requires an appropriately designed lubrication system.

Grease or oil selection should consider rotational speed, load, operating temperature and the surrounding equipment.

Do not assume that an open bearing contains sufficient factory-applied lubricant for operation without additional lubrication.

Storage

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

Protect it from moisture, contamination and mechanical damage before installation.

Frequently Asked Questions - SKF 629/C3

What are the dimensions of SKF 629/C3?

The bearing has a 9 mm bore diameter, 26 mm outside diameter and 8 mm width. Its dimensions are 9x26x8 mm.

What does C3 mean in SKF 629/C3?

C3 indicates radial internal clearance greater than normal. It may be required where bearing fits or thermal conditions reduce the internal clearance during operation.

Is SKF 629/C3 an open bearing?

Yes. The basic SKF 629/C3 configuration does not include integrated metal shields or contact seals.

Are SKF 629 and SKF 629/C3 the same bearing?

No. Although they share the same basic dimensions, they have different radial internal clearance groups. SKF 629/C3 has increased clearance.

Can SKF 629-2Z/C3 replace SKF 629/C3?

Not automatically. The 2Z variant has metal shields on both sides, which affect the bearing's protective arrangement and lubrication conditions. Interchangeability must be checked against the machine design.

Can SKF 629/C3 support axial loads?

Yes. As a single row deep groove ball bearing, it can accommodate axial loads in both directions within the permissible limits of the bearing design and operating conditions.

Does SKF 629/C3 require lubrication?

Yes. The open bearing requires a suitable lubrication arrangement. The lubricant must be selected according to the operating conditions.

Is a 9x26x8 C3 bearing from another manufacturer interchangeable?

Not necessarily. The bearing design, tolerances, cage, internal clearance, load ratings, operating speed and application requirements must be verified. Matching dimensions and C3 clearance alone do not establish complete interchangeability.

SKF 629/C3 - Key Technical Information

SKF 629/C3 is a single row deep groove ball bearing measuring 9x26x8 mm. It features an open design, a pressed steel cage and C3 radial internal clearance greater than normal. The bearing supports radial and bidirectional axial loads within its design limits. Suitable lubrication and protection against contamination must be provided by the surrounding assembly.

SKF 629/C3 at simmering.pl

SKF 629/C3 is available through simmering.pl, a specialist supplier of rolling bearings and industrial mechanical components.

We support maintenance departments, machinery repair specialists, engineers and industrial B2B customers with bearing identification and procurement.

Our warehouse and order processing operations are located in Lublin, Poland. We supply customers throughout Europe and international markets, with worldwide shipping options.