If I'm not mistaken, the thread size is what determines the recommended torque, and that is directly related to the bolt head size. I believe that you may be looking at the wrong portion of the sensor when you made this observation. I would certainly be hesitant to make the guarantee that you made, assuming that the sensor takes the same size socket (27mm) as the rear axle nut. That's my story and I'm sticking to it until someone can show me conclusively that it's wrong. Note that I stated 80lbf-ft, max, not necessarily that value, as that value is unknown to us mortals.
I stand by my statement. In this case I think it is safe to say the sensor, the microphone and 12v switch are taking up room, and placed inside the head of the bolt, making the head bigger then it needs to be.
Different grade bolts will reacte differently at the same torque.
Different metals will hold torque different.
There are meny different threads with the same bolt head size.
The bolt size, thread, pitch and type of metal should give us a idea of the torque it can handle we still have to ask about what it's going into and what the bolt is holding.
For example spark plugs all seem to have similar torque values. 5/8 or 13/16, in steal or aluminum block.
Sorry about the long reply, more and more came to mind. I'm sure I did leave out lots of technical stuff, no need for that, a engineer could say much more.
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