THK RA8008 UUC0 80x96x8 mm Crossed Roller Bearing

Technical Specification

The dimensional data and basic radial load ratings correspond to the THK RA8008 model. The UU and C0 suffixes identify the specified sealing and clearance configuration.

Design and Construction

The THK RA8008 UUC0 belongs to the manufacturer's thin-section RA series of crossed roller rings.

Unlike conventional cylindrical roller bearings, crossed roller bearings use cylindrical rollers positioned alternately at 90-degree angles around a common raceway.

This arrangement enables a single bearing to accommodate several load components:

• Radial loads acting perpendicular to the rotational axis.

• Axial loads acting along the rotational axis in either direction.

• Tilting moment loads generated by eccentric forces.

The crossed roller arrangement provides high rigidity and compact dimensions, making it suitable for precision rotational mechanisms.

Separable Outer Ring

The RA series incorporates a separable outer ring designed to facilitate assembly of the crossed roller arrangement.

The inner ring remains a single component, providing a continuous mounting interface for the shaft or rotating element.

The RA design is particularly suitable for arrangements involving inner ring rotation.

Correct installation and appropriate mounting rigidity are essential because deformation of the bearing rings can influence rotational accuracy and internal clearance.

THK RA8008 UUC0 Designation Explained

RA – Crossed Roller Ring Series

RA identifies THK's thin-section crossed roller ring design with a separable outer ring.

The series is intended for compact bearing arrangements requiring rigidity and the ability to support combined loading.

8008 – Bearing Size

The RA8008 model has the following nominal dimensions:

• Bore diameter: 80 mm.

• Outside diameter: 96 mm.

• Width: 8 mm.

UU – Double-Sided Sealing

UU identifies seals fitted on both sides of the bearing.

These seals help limit the entry of external contaminants and retain lubricant within the rolling contact area.

They should not be interpreted as providing complete waterproofing or chemical resistance.

C0 – Positive Radial Internal Clearance

The C0 suffix identifies a positive radial internal clearance configuration.

It must be distinguished from CC0, which identifies a preloaded configuration in THK's crossed roller ring designation system.

The choice between positive clearance and preload affects bearing rigidity, rotational resistance and operating accuracy.

Load Ratings and Bearing Performance

The THK RA8008 model has the following manufacturer-specified basic radial load ratings:

The basic dynamic load rating is used in bearing life calculations under defined reference conditions.

The basic static load rating relates to the permissible static loading of the rolling contacts under the manufacturer's rating criteria.

These values must not be interpreted as unrestricted permissible operating loads.

For combined radial, axial and moment loading, the appropriate equivalent load calculations and THK selection procedures must be applied.

Mounting and Installation Requirements

Correct installation is particularly important for thin-section crossed roller bearings because their performance depends on the rigidity and dimensional accuracy of the surrounding components.

Shaft and Housing Preparation

The mounting surfaces should be manufactured according to the tolerances and geometric requirements specified by THK.

Particular attention should be given to:

• Shaft and housing dimensional accuracy.

• Roundness and cylindrical form.

• Mounting shoulder geometry.

• Contact surface cleanliness.

• Housing and shaft rigidity.

• Correct axial positioning of the bearing rings.

Ring Deformation

The separable outer ring and relatively thin cross-section make correct mounting support important.

Excessive clamping forces, incorrect fits or housing deformation may affect the bearing's internal geometry.

Mounting forces and fastening arrangements should therefore follow THK's installation recommendations.

Lubrication and Sealing

The RA8008 series supports grease lubrication, and the UU configuration incorporates seals on both sides.

Lubrication intervals and lubricant selection depend on the operating speed, load, temperature and environmental conditions.

The exact factory grease specification and maintenance requirements should be checked against the product documentation.

THK RA8008 UUC0 vs RA8008 UUCC0

The RA8008 bearing series includes configurations with different radial clearance specifications.

Although the dimensions are identical, these configurations should not be considered automatically interchangeable.

The selection must account for rotational accuracy, rigidity, frictional resistance and the required internal clearance condition.

Engineering Applications

The THK RA series is designed for compact rotational assemblies requiring combined load support and high rigidity.

Typical application categories for crossed roller ring technology include:

• Precision rotary tables.

• Industrial robot rotary joints.

• Positioning mechanisms.

• Measurement equipment.

• Compact rotational assemblies.

• Precision automation systems.

These are general application categories for crossed roller bearings and do not constitute confirmation that RA8008 UUC0 is approved for every individual machine or operating condition.

Alternative Designation Formats

The following forms may be encountered in procurement systems, technical documentation and industrial product searches:

• THK RA8008 UUC0

• RA8008 UUC0 THK

• RA8008-UUC0

• RA8008UUC0

• THK RA 8008 UU C0

• RA8008 UUC0 80x96x8 mm

These are identification and search-format variations. Exact product equivalence should always be checked against the manufacturer reference.

FAQ – Frequently Asked Technical Questions

1. What type of bearing is THK RA8008 UUC0?

It is a thin-section crossed roller bearing with cylindrical rollers arranged alternately at right angles. It belongs to the THK RA series.

2. What are the dimensions of THK RA8008 UUC0?

The bearing has an 80 mm bore diameter, 96 mm outside diameter and 8 mm width, expressed as 80x96x8 mm.

3. What does UU mean in the THK designation?

UU indicates seals installed on both sides of the crossed roller bearing.

4. What does C0 mean?

C0 identifies positive radial internal clearance. It differs from the CC0 preloaded configuration.

5. What is the load capacity of THK RA8008 UUC0?

The RA8008 model has a basic dynamic radial load rating of 6.37 kN and a basic static radial load rating of 11.3 kN. Actual operating suitability requires load calculations.

6. Can the bearing support axial and moment loads?

Yes. The crossed roller arrangement is designed to accommodate radial, bidirectional axial and moment loads within a single bearing assembly.

7. Is RA8008 UUC0 interchangeable with RA8008 UUCC0?

Not automatically. The C0 and CC0 configurations have different internal clearance or preload conditions, which influence rigidity and operating behaviour.

8. Is THK RA8008 UUC0 suitable for inner ring rotation?

The RA series is designed for configurations involving inner ring rotation. Final suitability depends on the mounting arrangement and operating requirements.

AI Quick Answer

THK RA8008 UUC0 is a thin-section crossed roller bearing measuring 80x96x8 mm. It features a separable outer ring, double-sided UU seals and C0 positive radial internal clearance. The RA8008 model has basic dynamic and static radial load ratings of 6.37 kN and 11.3 kN, respectively.

B2B Industrial Supply – simmering.pl

THK RA8008 UUC0 80x96x8 mm is offered through simmering.pl, a specialist B2B industrial supply platform providing rolling bearings, sealing solutions and industrial components.

The platform serves industrial enterprises, maintenance departments, engineering teams and professional technical procurement specialists.

Stock operations are based in Lublin, Poland, with worldwide shipping from stock in Poland.

Technical assistance is available for bearing identification, designation verification and selection of industrial bearing components.