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THK RA 6008 Crossed Roller Bearings

With the Cross-Roller Bearing, cylindrical rollers are arranged crosswise, with each roller perpendicular to the adjacent roller, in a 90 ゜ V groove, separated from each other by a spacer retainer. This design allows just one bearing to receive loads in all directions including, radial, axial and moment loads.

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RA Type THK Cross roller bearings

Part Number RA6008 Bearings
Bearing Type Crossed Roller Bearing
For Load Direction Combined Radial; Thrust; and Moment
Construction Single Row
Seal Type Open, Separable outer ring type
ABEC Rating ABEC-5 ABEC-7 ABEC-9
Ring Material Steel
Roller Material Steel
Shaft dia. mm 60
Mass(kg) 0.09
Bore Dia (d) 60
Outer Dia (D) 76
Width (B) 8
Greasing hole(a) 2
Greasing hole(b) 0.8
r(min) 0.5
Shoulder height ds(max) 63.5
Shoulder height Dh(min) 70.5
Basic load rating (radial)C kN 5.68
Basic load rating (radial)Co kN 8.68
Lubrication Required
Shaft Mount Type Press Fit
Temperature Range 0 -230
With the Cross-Roller Bearing, cylindrical rollers are arranged crosswise, with each roller perpendicular to the adjacent roller, in a 90 ゜ V groove, separated from each other by a spacer retainer. This design allows just one bearing to receive loads in all directions including, radial, axial and moment loads.

● High Rotation Accuracy of RA 6008 Cross Roller Bearing


The spacer retainer fitting among cross-arrayed rollers prevents rollers from skewing and the rotation torque from increasing due to friction between rollers. Unlike conventional types using steel sheet retainers, the Cross- Roller Ring does not cause displacement or locking of rollers and provides a stable rotation torque.

Since the inner and outer rings are designed to be separable, the bearing clearance can be adjusted. In addition, highly accurate rotary motion is ensured through adjusting the bearing clearance to provide a preload.


● Easy Handling

The inner and outer rings, which are separable, are secured to the Cross-Roller Ring body after the rollers and spacer retainers are installed. This procedure prevents the rings from separating from each other. Thus, it is easy to handle the rings when installing the Cross-Roller Ring.




Major dimensions Shoulder dimensions Basic load rating Mass
Shaft diameter
(radial)
TKW Model No. Inner diameter Outer diameter Roller pitch circle diameter









d D dp Width Greasing hole


C C0





B B1 a b rmin ds Dh kN kN kg
50 RA 5008 50 66 57 8 2 0.8 0.5 53.5 60.5 5.1 7.19 0.08
60 RA 6008 60 76 67 8 2 0.8 0.5 63.5 70.5 5.68 8.68 0.09
70 RA 7008 70 86 77 8 2 0.8 0.5 73.5 80.5 5.98 9.8 0.1
80 RA 8008 80 96 87 8 2 0.8 0.5 83.5 90.5 6.37 11.3 0.11
90 RA 9008 90 106 97 8 2 0.8 0.5 93.5 100.5 6.76 12.4 0.12
100 RA 10008 100 116 107 8 2 0.8 0.5 103.5 110.5 7.15 13.9 0.14
110 RA 11008 110 126 117 8 2 0.8 0.5 113.5 120.5 7.45 15 0.15
120 RA 12008 120 136 127 8 2 0.8 0.5 123.5 130.5 7.84 16.5 0.17
130 RA 13008 130 146 137 8 2 0.8 0.5 133.5 140.5 7.94 17.6 0.18
140 RA 14008 140 156 147 8 2 0.8 0.5 143.5 150.5 8.33 19.1 0.19
150 RA 15008 150 166 157 8 2 0.8 0.5 153.5 160.5 8.82 20.6 0.2
160 RA 16013 160 186 172 13 2.5 1.6 0.8 165 179 23.3 44.9 0.59
170 RA 17013 170 196 182 13 2.5 1.6 0.8 175 189 23.5 46.5 0.64
180 RA 18013 180 206 192 13 2.5 1.6 0.8 185 199 24.5 49.8 0.68
190 RA 19013 190 216 202 13 2.5 1.6 0.8 195 209 24.9 51.5 0.69
200 RA 20013 200 226 212 13 2.5 1.6 0.8 205 219 25.8 54.7 0.71


Crossed roller bearing is a special type bearing with split inner ring and rotating outer ring. Since the divided inner ring or outer ring is installed with rollers and spacers, it is fixed with the cross roller ring to prevent separation from each other, so it is easy to operate when installing the cross roller ring. Since the rollers are arranged in a cross, only one set of cross roller rings can bear loads in all directions. Compared with the conventional model, the rigidity is increased by 3 to 4 times. At the same time, because the inner ring or outer ring of the cross roller bearing has a two-part structure, the bearing gap can be adjusted, and even if preload is applied, high-precision rotational movement can be obtained. Moreover, due to its special structure, it is usually used as a joint bearing in industrial robots.


When you purchase the crossed roller bearings, please confirm the designation first.

1.  Model RU (Integrated Inner/Outer Ring Type) 

2. Model RB (Separable Outer Ring Type for Inner Ring Rotation)

3. Model RE (Separable Inner Ring Type for Outer Ring Rotation)

4. USP-Grade Series of Models RB/RE

5. Model RA (Separable Outer Ring Type for Inner Ring Rotation)

6. Model RA-C (Single-Split Type)


cross roller bearings


Features of Crossed Roller Bearings RA6008

1. Excellent rotation accuracy

2. Simplified operation and installation

3. Withstand large axial and radial loads

4. Significantly save installation space

5. High speed capability

6. Reduce shaft length and processing costs, thermal expansion causes limited changes in geometric dimensions

7. Adopt nylon divider, low moment of inertia, low starting torque, easy to control angle indexing

8. Optimize the pre-tightening force, the rigidity is large, and the guiding roller has high precision

9. Carburized steel provides excellent impact resistance and surface abrasion resistance

10. Simple but well lubricated


EASIER designs and manufactures a variety of crossed roller bearings that can handle radial, thrust and moment loads at the same time. These compact bearings feature rollers crossed at right angles between inner and outer rings.


-- Widely used in machine tools, industrial robots and medical equipment because of their high rotational accuracy.

-- Roller guide options include a cage or separator as well as a full complement design. Both the cage and separator styles offer a small coefficient of friction for high-speed rotation. Full complement bearings handle heavy loads at low speeds.

-- Sealed and open designs are available. Sealed bearings incorporate synthetic rubber seals to protect against dust, dirt and grease.


E-mail: sales@xrbearing.com, brandbearings@gmail.com

Skype:brandbearings

Whatsapp: 0086-13280450757

www.electricallyinsulatedbearings.com