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Spherical bearing
Spherical Rolling Joint SRJ series

Rolling guide with zero clearance has realized high rigidity and high precision.

Joints with multiple degrees of freedom essential to parallel mechanism have conventionally obtained 2~3 degrees of freedom by combining rotational joints.
However, these joints have been characterized by upsizing due to complex structure.
Sliding spherical joints with multiple degrees of freedom have also been available, however, they have had large frictional resistance and inner clearance.
In order to resolve these problems, HEPHAIST SEIKO has developed rolling Spherical Rolling Joint.

High precision
The movable part has less frictional resistance due to its rolling joint structure under preload, achieving high precision with zero clearance.
Downsizing of joints with multiple degrees of freedom
Compared with those combining rolling bearings with 3 degrees of freedom, higher rigidity and downsizing has been achieved.
Application to parallel mechanism
Optimal for achieving high precision, high rigidity and downsizing of parallel mechanism.
Superfine inner spherical machining technology
Realized with superfine inner spherical machining technology of HEPHAIST.
Type selection


Product specifications
C series
Type A B C D E F G H K M N C(N) Co(N) Spot facing depth Width across flat Weight (kg) permissible angle of swing
SRJ004C 19 15 3.8 2.5 10 6 M3 3.6 2 6 1.5 128 100 1.5 4 0.015 ±15°
SRJ006C 25 20 5.5 3.8 11.5 8 M4×0.5 4.5 3 10 2 320 280 2.3 5 0.036 ±30°
SRJ008C 30 24 7 4 16 12 M5×0.5 5.5 3.4 11 2 490 540 2 7 0.06 ±30°
SRJ012C 42 34 11 6 20 15 M10 11 4.3 14 2 720 770 3.6 14 0.18 ±30°
SRJ016C 56 45 12 7 32 18 M12 12.6 5.5 25 5 1170 1300 4.6 14 0.37 ±30°
SRJ024C 74 62 17 11 42 23 M14 15 6.6 35 7 2840 3920 5.5 17 0.93 ±30°
SRJ032C 100 84 22 16 60 30 M16 16.6 9 48 10 5800 8820 8.6 22 2.3 ±30°
SRJ048C 136 114 38 22 78 38 M28×2 30 11 60 10 10600 16000 10.8 30 6.73 ±30°
*:  C and Co indicate the cases of compression (indentation) loads acting on the rod. The above dimensions may be changed without prior notice.
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