What decrease in torque can be expected with a 3mm hex compared to a 4mm hex?

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In summary, the conversation discusses the decrease in maximum torque that a set screw with a 3mm hex and its driver can withstand compared to a set screw with a 4mm hex. The speaker is seeking information on the expected decrease without having to physically test the parts. Based on previous discussions, it is suggested to use approximately 40% of the 4mm torque when tightening the 3mm screw. A link is provided for further information.
  • #1
sbbiomed
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I have done mechanical testing on a set screw with a 4mm hex and its driver. I now have a set screw with a 3mm hex. Without the time and expense of making parts and testing, I want to know the percentage decrease in maximum torque that the set screw and/or driver will be able to withstand on the 3mm hex. I am getting a torque limiting device and I need it to be used for both set screws and I don't want it to strip the hex on the 3mm driver by being too large of a value.

If the materials and hex depth do not change (only change is 4mm to 3mm hex), what decrease do I expect to see in the 3mm hex?

Thanks,
sbbiomed
 
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  • #2
If I understand your question correctly, you should use about 40% of the 4 mm torque when tightening the 3 mm screw.
 
  • #3
How did you get 40%

How did you get to 40%?
 

FAQ: What decrease in torque can be expected with a 3mm hex compared to a 4mm hex?

What is torque to strip hex wrenches?

Torque to strip hex wrenches is a measurement of the amount of force or twisting required to strip the head of a hex bolt or screw. It is an important consideration when using a hex wrench to ensure proper tightening without damaging the fastener.

How is torque to strip calculated?

Torque to strip is calculated by multiplying the coefficient of friction between the wrench and bolt head by the diameter of the bolt and the yield strength of the material. This calculation can vary depending on the specific materials and conditions, so it is important to consult a torque chart or calculator for accurate measurements.

What factors can affect torque to strip?

There are several factors that can affect torque to strip, including the material and surface finish of the bolt and wrench, the lubrication of the threads, and the angle of the wrench. It is also important to consider the material and strength of the fastener being tightened.

How do I prevent stripping hex wrenches?

To prevent stripping hex wrenches, it is important to use the correct size and type of wrench for the fastener, and to apply the appropriate amount of torque using a torque wrench or other measuring tool. It is also recommended to use lubrication on the threads and to avoid over-tightening the fastener.

What are the consequences of stripping hex wrenches?

If a hex wrench is stripped, it can result in difficulty removing the fastener or even complete failure of the joint. This can lead to costly repairs and potential safety hazards. It is important to use caution and proper techniques when using hex wrenches to avoid stripping them.

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