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Japan RA 8008 Crossed Roller Bearings

RA8008 80x96x8mm-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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Availability:
  • RA 8008
  • EASIER / TKW
  • CRBS808AUUE08
  • Best Factory Price

RA Type THK Cross roller bearings

RA8008 80x96x8mm-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.
Part Number RA8008 Bearings
Bearing Type Crossed Roller Bearings
For Load Direction Combined Radial; Thrust; and Moment
Construction Single Row
Interchange Brand THK,IKO,TKW,China  
ABEC Rating ABEC-5 ABEC-7 ABEC-9
Ring Material Steel
Roller Material Steel
Shaft dia. mm 80
Mass(kg) 0.11
Bore Dia (d) 80
Outer Dia (D) 96
Width (B) 8


● High Rotation Accuracy of RA 8008/CRBS808AUUE08 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.


● Skewing Prevention

The spacer retainer keeps rollers in their proper position, thereby preventing them from skewing. This eliminates friction between rollers, and therefore secures a stable rotation torque.

● Significantly Increased Rigidity (Three to Four times Greater)

Unlike the thin angular ball bearings installed in double rows, the cross array of rollers allows a single Cross-Roller Ring unit to receive loads in all directions, increasing the rigidity to three to four times greater than the conventional type.




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


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 RA8008/CRBS808AUUE08

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


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.


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