Check whether the profile is injured or not by visual inspection, if yes, fix it with triangular rasp as left, then, refining it with crocus paper as right.

 

 

 

Clean the inner thread and outer thread by using cleaning naphtha or cleaning fluid then lubricate it before assembling.

 

 

 

Lubricate the inner thread and the outer thread before assembling. (refer to left and right).

 

 

 

Lock the locknut manually until it contacted end surface (please refer to left and right), please skip this step if the locknut type is YSK.

 

 

 

For YSF, YSR and YSA locknut, loosen the screws slightly after the locknut is contacted the end surface(left side); For YSK locknut, loosen the screws slightly before the locknut is contacted the end surface.

 

 

 

Choose suitable tool to apply the needed torque onto locknut.

Assembly tools for precision locknut

 

 

 

Divide the needed torque and apply it onto locknut by using digital wrench with hook wrench for 3-4 times.

e.g. If the needed torque is 90N-m, divide it into 30N-m→60N-m→90N-m, then apply the torque as follow:

 

1. first, 30N-m on each groove

 

 

 

2. second, 60N-m on each groove

 

 

 

3. final, 90N-m on each groove

 

 

 

Follow above steps until reaching needed torque.

 

For YSK locknut, please use pin wrench collocate with digital wrench (left & right), and assembly the locknut according to above steps.

 

Use digital wrench collocate socket wrench (left & right), by this kind of wrench, you can apply the torque onto locknut equally, therefore, the needed torque can be applied directly.

 

Socket wrench for YSK type

 

 

 

Apply the torque onto set screws until reaching needed value with suitable torque wrench.

e.g. If the needed torque is 9N-m, dividing it into 3N-m→6N-m→9N-m, then apply the torque as follow:

 

1. first, 3N-m on each groove

 

 

 

2. second, 6N-m on each groove

 

 

 

3. final, 9N-m on each groove

 

 

 

The locking way of set screws of YSK type

e.g. If the needed torque is 9N-m, dividing it into 3N-m→6N-m→9N-m, then apply the torque as follow:
1. first, 3N-m on each groove
2. second, 6N-m on each groove
3. final, 9N-m on each groove
Follow above steps until reaching needed torque.

 

Applying the torque with U shaped wrench for YSK locknut is not recommended due to the locking way of this kind of locknut can cause deformation and leads thread seizing easily.

 

 

 

The torque can be influenced by many factors, e.g. the preload of bearing(ball screw), different kind of locknut, the accuracy, hardness, processing way of surface, even type of lubricant, therefore, there’s no specific torque value, the recommend torque value is for reference.

Should you have any questions in assembling locknut, please check YINSH website at Q & A section or please contact us directly, thank you!