FAG QJ208-TVP 40x80x18 mm - Four-Point Contact Ball Bearing

FAG QJ208-TVP 40x80x18 mm - Four-Point Contact Ball Bearing

FAG QJ208-TVP is a single-row four-point contact angular contact ball bearing manufactured by FAG, a Schaeffler brand. The bearing has dimensions of 40x80x18 mm, a split inner ring and a one-piece outer ring. It belongs to the QJ2 dimensional series. The TVP suffix identifies a glass-fibre reinforced polyamide window-type cage guided by the balls. Its design enables axial loads to be accommodated in both directions.

Technical Specifications - FAG QJ208-TVP

What Does FAG QJ208-TVP Mean?

The designation QJ208-TVP identifies a specific FAG four-point contact bearing design.

QJ - Four-point contact angular contact ball bearing with a split inner ring. The design enables axial loads to be carried in both directions.

2 - Dimensional series 2.

08 - Bore code corresponding to a nominal bore diameter of 40 mm.

TVP - Solid window-type cage made of glass-fibre reinforced polyamide, guided by the balls.

The absence of a sealing suffix corresponds to the open bearing design.

The TVP suffix is technically significant and should be retained when identifying or ordering a replacement bearing.

FAG QJ208-TVP Dimensions

The principal bearing dimensions are:

• Bore diameter d: 40 mm

• Outside diameter D: 80 mm

• Width B: 18 mm

Bearing dimensions: 40x80x18 mm.

These dimensions correspond to the QJ208 bearing size. However, the four-point contact design, cage execution and requirements concerning internal clearance and loading must also be considered when selecting a replacement.

Bearings with identical principal dimensions may have different internal designs and perform different functions within a bearing arrangement.

Construction of FAG QJ208-TVP

QJ208-TVP belongs to the family of single-row four-point contact angular contact ball bearings.

Its characteristic construction includes:

• One-piece outer ring.

• Axially split, two-piece inner ring.

• Single row of balls.

• Raceway geometry providing four-point contact capability.

• TVP polyamide cage.

• Open design without integrated seals.

The split inner ring allows the bearing to accommodate a relatively large number of balls compared with certain conventional angular contact ball bearing arrangements of similar dimensions.

The principal advantage of this construction is the ability to accommodate axial loads acting in both directions using a single bearing.

Four-Point Contact Raceway Geometry

The raceway geometry of FAG QJ208-TVP provides four potential contact points between each ball and the bearing rings.

This does not mean that all four contact points continuously carry the load simultaneously during normal operation.

Under a predominantly axial load acting in one direction, the load is transmitted through the corresponding pair of contact points.

When the axial load direction reverses, the active contact pair changes.

This enables a single four-point contact bearing to support axial forces acting in either direction.

The contact conditions depend on the magnitude and direction of the applied loads, internal clearance and bearing arrangement.

Contact Angle of 35 Degrees

FAG QJ208-TVP has a nominal contact angle of 35 degrees.

The contact angle describes the geometry through which forces are transmitted between the balls and raceways.

For four-point contact bearings, this geometry is particularly important for axial load accommodation.

However, the permissible operating loads cannot be determined from the contact angle alone.

Bearing selection must also consider catalogue load ratings, load direction, rotational speed, axial clearance and mounting arrangement.

What Loads Can FAG QJ208-TVP Accommodate?

The primary function of FAG QJ208-TVP is to accommodate axial loads in both directions.

The bearing can also accommodate certain radial loads, but the four-point contact design requires particular attention when radial and axial loads act simultaneously.

Excessive radial loading may produce unfavourable ball-to-raceway contact conditions, increased friction and higher operating temperatures.

For this reason, four-point contact ball bearings are frequently used in arrangements where a separate bearing carries the radial load.

In such an arrangement, QJ208-TVP can provide axial location of the shaft while another bearing provides radial support.

The suitability of this arrangement depends on the design of the complete bearing system.

TVP - FAG Polyamide Cage

The TVP suffix identifies the cage execution.

FAG QJ208-TVP uses a solid window-type cage manufactured from glass-fibre reinforced polyamide and guided by the balls.

The cage maintains the correct spacing between rolling elements and prevents direct contact between adjacent balls.

When selecting a bearing with a polyamide cage, the following factors must be considered:

• Operating temperature.

• Lubricant type.

• Material compatibility.

• Rotational speed.

• Loading conditions.

A TVP cage should not automatically be replaced by a brass or steel cage execution without verifying the operating requirements.

Split Inner Ring Design

A characteristic feature of the QJ bearing design is its axially split inner ring.

This arrangement allows the ball complement to be assembled and provides the raceway geometry required to accommodate axial loads in both directions.

During installation, both halves of the inner ring must remain part of the complete bearing assembly.

Neither half should be treated as an independent bearing ring intended for separate operation.

The components must be installed according to the requirements of the specific bearing design.

FAG QJ208-TVP vs Other Bearing Variants

QJ208-TVP vs QJ208-XL-TVP

The XL designation in Schaeffler nomenclature identifies an X-life bearing execution.

QJ208-XL-TVP belongs to the same basic bearing family but may have different catalogue performance characteristics from an earlier version without the XL designation.

Dynamic load ratings, static load ratings, speed limits and other technical values must not automatically be transferred from the XL version to QJ208-TVP.

QJ208-TVP vs QJ208-MPA

Both designations refer to four-point contact ball bearings of the same basic dimensional size.

One important difference concerns cage construction.

QJ208-TVP uses a glass-fibre reinforced polyamide cage guided by the balls.

QJ208-MPA identifies a solid machined brass cage guided by the outer ring.

Before substituting one version for the other, operating temperatures, lubrication conditions, speed requirements and other technical characteristics must be compared.

QJ208-TVP vs 7208-B-TVP

QJ208-TVP and 7208-B-TVP have the same principal dimensions of 40x80x18 mm, but their internal construction and operating functions differ.

QJ208-TVP:

• Single-row four-point contact ball bearing.

• Split inner ring.

• Accommodates axial loads in both directions.

7208-B-TVP:

• Single-row angular contact ball bearing.

• Designed to accommodate axial load in one direction.

• May require an appropriate paired arrangement to accommodate axial loads in both directions.

Matching dimensions do not establish direct interchangeability.

QJ208-TVP vs 6208

A standard 6208 deep groove ball bearing also has dimensions of 40x80x18 mm.

However, QJ208-TVP has a four-point contact design intended primarily for axial load accommodation.

A 6208 deep groove ball bearing must not automatically be considered a replacement for QJ208-TVP.

Alternative Designations and Search References

Natural identification variants include:

• FAG QJ208-TVP

• QJ208-TVP FAG

• FAG QJ 208 TVP

• QJ 208 TVP FAG

• FAG QJ208TVP

• QJ208TVP FAG

• FAG QJ208-TVP 40x80x18

• QJ208-TVP 40x80x18

• FAG QJ208-TVP bearing

• FAG QJ208-TVP four-point contact ball bearing

• QJ208-TVP angular contact bearing

• FAG four-point contact bearing 40x80x18

For technical documentation and purchasing, the complete manufacturer designation should be used:

FAG QJ208-TVP

Additional suffixes such as XL or N2 must not be added unless they are confirmed as part of the specific bearing execution being ordered.

Bearing Selection and Interchangeability

Before purchasing FAG QJ208-TVP or selecting an equivalent bearing, verify:

• Complete manufacturer designation.

• Principal dimensions of 40x80x18 mm.

• QJ four-point contact construction.

• TVP cage execution.

• Axial internal clearance.

• Dynamic and static load ratings.

• Rotational speed.

• Operating temperature.

• Lubrication requirements.

• Shaft axial location arrangement.

• Interaction with other bearings in the system.

It is particularly important to establish whether the bearing will primarily accommodate axial loads or whether significant radial loads will also be present.

When considering a bearing from another manufacturer, compare the complete technical specifications rather than relying solely on the QJ208 designation and principal dimensions.

Typical Applications of Four-Point Contact Ball Bearings

Four-point contact ball bearings are used in bearing arrangements requiring axial load accommodation in both directions within a relatively compact installation space.

Typical applications for this bearing design include:

• Industrial gearbox bearing arrangements.

• Axial shaft locating systems.

• Bearing arrangements with separate radial support.

• Drive systems requiring bidirectional axial location.

These are typical applications associated with four-point contact bearing construction. They do not establish FAG QJ208-TVP as a confirmed OEM component for any specific gearbox or machine model.

Mounting FAG QJ208-TVP

Before installation, clean the shaft, housing bore and all bearing seating surfaces.

Particular attention should be paid to:

• Correct shaft and housing fits.

• Completeness of the split inner ring.

• Protection of balls and raceways against damage.

• Correct axial location of the bearing components.

• Axial clearance after installation.

• Appropriate lubrication.

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

Force must not be transmitted through the balls and raceways.

Where the four-point contact bearing operates together with a separate radial bearing, the installation must be checked against the design requirements of the complete bearing arrangement.

Lubrication and Storage

FAG QJ208-TVP is an open bearing.

The lubrication method must be selected according to the bearing arrangement, rotational speed, operating loads and temperature.

A specific lubricant type or quantity should not be assumed without the application documentation.

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

Protect it against moisture, dust, aggressive substances and mechanical damage.

The packaging should preferably be opened immediately before installation.

FAQ

What are the dimensions of FAG QJ208-TVP?

FAG QJ208-TVP measures 40x80x18 mm. The bore diameter is 40 mm, the outside diameter is 80 mm and the width is 18 mm.

Is FAG QJ208-TVP a single-row bearing?

Yes. It is a single-row four-point contact angular contact ball bearing with an axially split inner ring.

What does QJ mean in FAG QJ208-TVP?

QJ identifies a four-point contact angular contact ball bearing design capable of accommodating axial loads in both directions.

What does TVP mean?

TVP identifies a solid window-type cage made from glass-fibre reinforced polyamide and guided by the balls.

Can FAG QJ208-TVP accommodate axial loads in both directions?

Yes. Bidirectional axial load accommodation is a primary function of its four-point contact construction. Permissible loads depend on the catalogue ratings and actual operating conditions.

Is FAG QJ208-TVP sealed?

No. QJ208-TVP is an open bearing without integrated seals on either side.

Can a 6208 bearing replace FAG QJ208-TVP?

Not without a detailed engineering assessment. Although both bearings have dimensions of 40x80x18 mm, they differ in raceway geometry, internal construction and intended function.

Are QJ208-TVP and QJ208-XL-TVP identical?

Complete equivalence should not be assumed. XL identifies the Schaeffler X-life execution. The catalogue specifications of both versions should be compared before substitution.

FAG QJ208-TVP - Key Information

FAG QJ208-TVP is a single-row four-point contact angular contact ball bearing measuring 40x80x18 mm. It features an axially split inner ring, a nominal contact angle of 35 degrees and a glass-fibre reinforced polyamide TVP cage. Its principal function is to accommodate axial loads in both directions, enabling axial location of a shaft.

FAG QJ208-TVP can be ordered from the specialist industrial bearing supplier simmering.pl. Stock in Poland, worldwide shipping and technical assistance with FAG bearing identification and selection.