UJ

Features

・Miniature coupling, utilizing the fatigue resistance of engineering plastics.
・Light, smooth rotational transmission, thanks to excellent bending fatigue performance superior to that of metal products made of aluminum alloys.
・Suitable for light-load transmissions, for devices such as rotary switchers, encoders, and small motors.

・Suitable for rotational transmissions requiring electrical insulation.

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Configuration and materials

 

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Cautions when using plastic couplings
・Since they are made of plastic, their strength is inferior to that of metal products. So please take care when handling.
・Take care not to exceed the rated value of the fastening torque (given in the table) for set screws. Otherwise around the screw may be damaged, resulting in axial slip.
・Insert the shaft securely to the B dimension of the external diagram, and do not insert it beyond the slit part.
・Please design so that it does not exceed allowable torque even when excessive torque is applied, such as when starting or stopping the motor.
・When operating continuously at high speed (≧3,000 rpm), secure a safety factor more than twice the allowable value in the table.
・Use two UJ series couplings to connect shafts having a large parallel misalignment.

Dimensions

Item
No.
d1 

Standard hole diameters ød1,ød2 H8

(left/right can be freely conbined)

DLFBSet screw
MFastening
torque
(N⋅m)
UJ 2   2                               8 9 1.6 3.2 2 0.05
  2.5           3                       12 14.5 2.6 5.3 3 0.18
  3           3                       12 14.5 2.6 5.3 3 0.18

 

3.2               3.2                   12 14.5 2.6 5.3 3 0.2
  4           3       4               14 15 2.6 5.2 3 0.2
  5                       5           14 15 2.6 5.2 3 0.2
  6       2.4   3   3.2   4   5   6       15 15.5 2.8 5.5 3 0.2
  8                   4   5   6  

8

  18 17.8 2.6 5.5 3 0.25

Specifications

Item

No.

(d1-d2)

Allowable torque

(N⋅m)

Maximum

Rotating speed

(rpm)

Torsional rigidity
(N⋅m/rad)

Allowable parallel

misalignment

(mm)

Allowable angular

misalignment

(°)

Allowable

end play

(mm)

Moment of inertia
(kg⋅m2)
Mass
Materials
(g)
UJ 2-2 0.1 4,000 2.5 0.05 3 ±0.15  0.5x10-8 0.7 GFR PBT 
2.5-3 0.3 4,000 8 0.1 4 ±0.2   0.4x10-7 2.3 Polyacetal
3-3
3.2-3.2 0.4 4,000 8 0.1 4 ±0.2 0.4x10-7 2.2
4-3 0.5 5,000 9 0.1 5 ±0.3  0.6x10-7 2.4
4-4
5-5 0.6 5,000 9 0.1 5 ±0.3  0.6x10-7  2.7
6-2.4 0.6 6,000 9 0.1 5 ±0.3   0.8x10-7  3
6-3
6-3.2 0.6 6,000 9 0.1 5 ±0.3   0.8x10-7  3
6-4
6-5
6-6 0.6 6,000 9 0.1 5  ±0.3 0.8x10-7 3
8-4 0.9 6,000 25 0.2

 

5

 

 ±0.3    2.5x10-7 4 GFR PBT
8-5
8-6
8-8

・Heat resistance (ambient temperature):Polyacetal,-20℃ to 60℃ / GFR PBT,-30℃ to 85℃

・Note:When the ambient temperature to be used is the maximum, the permissible torque is 1/2 of the value in the table.