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Topic Torque Marks

Torque Marks

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This topic contains 2 replies, has 2 voices, and was last updated by  Mike 3 weeks, 2 days ago.

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  • #706887 Reply


    Anyone have experience with torque marks across fittings and bolts? Fittings are currently my biggest concern as per manufacturers recommendation should be made up until wrench meets resistance, marked with a line across the fitting then wrenched a certain number a flats past the initial mark. Having to stop making up the connection to mark the fitting, keeping track of the pen to mark, knowing the correct amount of flats to go past for different size fittings all create issues.
    Just wondering what others have done to solve this issue.

    #706892 Reply

    No experience with that but I’ve done some auto mechanics. Of course a torque wrench has to be eye-balled by the operator so that’s another variable. Today you can get a digital torque wrench that’s really accurate if properly calibrated. But it sounds like there are more variables in your situation than just torque. It sounds like a poor way to set torque, since you aren’t actually measuring that.

    #706918 Reply


    Using marks to identify when a nut has been correctly tightened is a common method of visibly assuring that a process has been carried out.
    It is typical to use both torque and angle, so achieve a set torque which will be when your torque wrench clicks and a given angle – the number o flats is just the way you are measuring the angle.

    Tightening to you feel resistance isnt a satisfactory method – you need a torque wrench set to the correct torque. In volume production DC tooling will do this for you and measure the angle that is turned after torque is reached but if you are using a manual wrench I am afraid you are stuck with doing this manually – usually by applyign tape to the wrench.

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