SKF 6208-2Z 40x80x18 mm - Deep Groove Ball Bearing

SKF 6208-2Z 40x80x18 mm - Deep Groove Ball Bearing

SKF 6208-2Z is a single-row deep groove ball bearing from the 6200 series with dimensions 40x80x18 mm, a cylindrical bore and two non-contact metal shields. The suffix 2Z identifies a metal shield on both sides of the bearing. The commonly used trade designation 6208 ZZ SKF refers to a double-shielded version, while the correct SKF catalogue designation is 6208-2Z.

SKF 6208-2Z - Technical Data

SKF 6208-2Z Dimensions

The principal dimensions of SKF 6208-2Z are:

d = 40 mm

D = 80 mm

B = 18 mm

Complete dimensional identification:

40x80x18 mm

SKF 6208-2Z belongs to the 6200 dimensional series. When selecting a replacement, the dimensions 40x80x18 mm should be checked together with the complete 2Z execution and other technical requirements.

What Does SKF 6208-2Z Mean?

6208

6208 is the basic bearing designation within the 6200 series.

The bore code 08 corresponds to a nominal bore diameter of:

d = 40 mm

For this reference, the complete principal dimensions are:

40x80x18 mm

2Z

The suffix 2Z means that the bearing has a metal shield on both sides.

SKF uses:

Z - metal shield on one side

2Z - metal shields on both sides

The shields are non-contact closures. Unlike contacting elastomer seals, they do not use a sealing lip rubbing against the mating surface in the same way as a contact seal.

The shields help retain lubricant inside the bearing and protect the internal components from contamination under conditions appropriate for this closure design.

Why Does SKF Use 2Z Instead of ZZ?

SKF's catalogue designation for this double-shielded bearing is:

6208-2Z

In industrial trade, purchasing systems and online searches, the following forms are also frequently encountered:

6208 ZZ

6208ZZ

6208 2Z

For exact product identification, however, the SKF manufacturer designation 6208-2Z should be retained.

SKF 6208-2Z Construction

SKF 6208-2Z is a single-row deep groove ball bearing.

Its principal components include:

• inner ring
• outer ring
• balls as rolling elements
• cage separating and guiding the balls
• two metal shields

The deep raceway grooves enable this bearing type to accommodate primarily radial loads and also axial loads in both directions within the operating limits of the bearing design.

The 6208-2Z version differs from the open 6208 by the presence of metal shields on both sides.

2Z Metal Shields

The two metal shields are one of the key identifying features of this variant.

In SKF nomenclature:

Z - one metal shield

2Z - two metal shields

The shields are non-contacting. This means they do not create the same type of frictional contact associated with contacting elastomer seals.

This distinction is important when comparing SKF 6208-2Z with sealed versions of the same basic bearing size.

Load Ratings

SKF specifies the following catalogue values for 6208-2Z:

C = 32.5 kN

The basic dynamic load rating is used in bearing rating-life calculations under dynamic operating conditions.

C0 = 19 kN

The basic static load rating is used when evaluating bearing performance under static or very slowly moving load conditions.

Pu = 0.8 kN

The fatigue load limit is a parameter used in bearing life and operating-condition calculations.

C, C0 and Pu are standardized bearing catalogue parameters. The C or C0 value should not be interpreted simply as the maximum permissible load of an installed bearing arrangement.

Speed Ratings

For SKF 6208-2Z, the catalogue values are:

Reference speed: 18,000 rpm

Limiting speed: 9,000 rpm

These are different technical parameters.

The actual permissible operating speed in a machine also depends on load, lubrication, temperature, heat dissipation, fits and the design of the complete bearing arrangement.

The catalogue speed values should therefore not automatically be treated as recommended continuous operating speeds for every application.

SKF 6208-2Z vs SKF 6208

Both versions have the same principal dimensions:

40x80x18 mm

However, their construction differs.

SKF 6208 is an open bearing.

SKF 6208-2Z has metal shields on both sides.

Identical dimensions therefore do not mean identical execution.

SKF 6208-2Z vs SKF 6208-Z

6208-Z has a metal shield on one side.

6208-2Z has metal shields on both sides.

When the machine documentation specifies a particular closure arrangement, the complete bearing designation should be followed.

SKF 6208-2Z vs SKF 6208-2Z/C3

These two designations should not be treated as identical.

6208-2Z identifies the bearing with two metal shields.

6208-2Z/C3 additionally includes the C3 suffix, which identifies radial internal clearance greater than Normal.

Both bearings have the same principal dimensions of 40x80x18 mm and use the 2Z closure arrangement, but their internal-clearance specifications differ.

SKF 6208-2Z/C3 should therefore not automatically be substituted for SKF 6208-2Z solely because the dimensions are identical.

SKF 6208-2Z vs Sealed 6208 Variants

The 6208 bearing family also includes versions using different closure systems.

The 2Z version uses non-contact metal shields.

Versions with elastomer seals use a different closure construction and can have different characteristics in terms of friction, contamination exclusion and operating speed.

For this reason, designations such as ZZ, 2Z, 2RS, 2RS1 and 2RSH should not be treated as universal synonyms.

Suffix nomenclature can also differ between bearing manufacturers.

Alternative Designations and Search References

The precise SKF catalogue designation is:

SKF 6208-2Z

Users, engineers and purchasing departments may also search for this bearing using forms such as:

6208-2Z SKF

SKF 6208 2Z

6208 2Z SKF

SKF6208-2Z

6208-2Z

SKF 6208 ZZ

6208 ZZ SKF

SKF 6208ZZ

6208ZZ SKF

6208 ZZ 40x80x18

6208-2Z 40x80x18

SKF 6208-2Z 40x80x18

SKF 6208 ZZ 40x80x18

6208 bearing 40x80x18

6208 shielded bearing

6208 double shielded bearing

6208 40mm bore bearing

40x80x18 bearing

40x80x18 ball bearing

40x80x18 deep groove ball bearing

40 mm bore ball bearing 6208

SKF deep groove ball bearing 6208

For SKF, the correct catalogue designation remains 6208-2Z. The term 6208 ZZ is useful as a common trade and search reference, but it should not replace the manufacturer's exact designation in technical documentation.

Selection and Interchangeability

When selecting SKF 6208-2Z, first check the complete designation on the removed bearing or in the machine documentation.

Important selection parameters include:

• complete 6208-2Z designation
• dimensions 40x80x18 mm
• 2Z shield configuration
• required internal clearance
• shield or seal type
• cage requirements where specified
• rotational speed
• radial and axial loads
• operating temperature
• lubrication conditions
• accuracy requirements
• shaft and housing fits
• requirements of the specific bearing arrangement

A 6208 ZZ or 6208-2Z bearing from another manufacturer may have the same principal dimensions, but its complete technical specification should still be checked before substitution.

Identical 40x80x18 mm dimensions do not by themselves establish full technical interchangeability.

Typical Applications of the 6208-2Z Design

Single-row deep groove ball bearings are used in many types of machinery where primarily radial loads and moderate axial loads occur.

The double-shielded version is suitable for bearing arrangements that require a bearing with metal shields on both sides.

This does not mean that SKF 6208-2Z should automatically be assigned to a specific motor, gearbox, vehicle or machine.

A specific application should only be stated when supported by machine documentation, an OEM reference or other reliable technical data.

Installation and Handling

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

Installation should be carried out in clean conditions.

Mounting force should be applied to the ring that is being installed with an interference fit. Mounting force should not be transmitted through the balls and raceways, as this can damage the rolling-contact surfaces.

The metal 2Z shields should not be deformed or damaged during handling and installation.

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

FAQ - SKF 6208-2Z

What are the dimensions of SKF 6208-2Z?

SKF 6208-2Z has dimensions of 40x80x18 mm: bore diameter d = 40 mm, outside diameter D = 80 mm and width B = 18 mm.

Are SKF 6208 ZZ and SKF 6208-2Z the same designation?

6208 ZZ is a commonly used trade description for a bearing with metal shields on both sides. SKF's exact catalogue designation for this product is 6208-2Z, which should be used for precise technical identification.

What does 2Z mean in SKF 6208-2Z?

The suffix 2Z means that the bearing has a non-contact metal shield on both sides.

Does SKF 6208-2Z have C3 clearance?

The designation 6208-2Z does not include the C3 suffix. SKF identifies the version with C3 clearance separately as 6208-2Z/C3.

Are SKF 6208-2Z and 6208-2Z/C3 the same size?

Yes. Both have principal dimensions of 40x80x18 mm, but their internal-clearance specifications differ. Dimensional compatibility alone does not make the two variants automatically interchangeable.

Can SKF 6208-2Z accommodate axial load?

Yes. As a deep groove ball bearing, it is designed primarily for radial loading but can also accommodate axial loads in both directions within the operating limits of the bearing and arrangement.

What is the dynamic load rating of SKF 6208-2Z?

The basic dynamic load rating C is 32.5 kN. The basic static load rating C0 is 19 kN, and the fatigue load limit Pu is 0.8 kN.

What is the speed rating of SKF 6208-2Z?

SKF specifies a reference speed of 18,000 rpm and a limiting speed of 9,000 rpm. The permissible speed in a specific application depends on the complete operating conditions.

SKF 6208-2Z - Key Information

SKF 6208-2Z is a single-row deep groove ball bearing from the 6200 series with dimensions 40x80x18 mm. The 2Z suffix identifies non-contact metal shields on both sides. Its basic dynamic load rating is 32.5 kN and static load rating 19 kN. The commonly searched designation 6208 ZZ refers to the double-shielded configuration.