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B.S. 951 Bonding Clamp.

Zoomup
Good morning,

                           I have often wondered at just what is the purpose of the locking nut on the main fixing screw on a B.S. 951 bonding clamp. On static non vibrating pipes I can hardly imagine the screw becoming loose. So, is the locking nut superfluous? Or is it perhaps to allow correct orientation of the razor blade sharp warning label?


Z.

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    Zoomup:

    I can't see that pipe expansion or contraction will create any rotational force on the main fixing screw so the locking nut is pointless. On fixing the clamp, the band will crush the pipe slightly thus creating a tight permanent grip for the bonding clamp.


    Z.


    Since the thread of a screw is at an angle, simply pushing against the thread creates a small rotational force.  It's usually too weak to overcome friction, which is why screws remain done up most of the time.


    Where a screw is subjects to a lot of vibration, something else is needed to keep it done up, perhaps a nylok nut or star washer.  Thermal expansion and contraction has the same effect, but much slower.


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  • 0
    Zoomup:

    I can't see that pipe expansion or contraction will create any rotational force on the main fixing screw so the locking nut is pointless. On fixing the clamp, the band will crush the pipe slightly thus creating a tight permanent grip for the bonding clamp.


    Z.


    Since the thread of a screw is at an angle, simply pushing against the thread creates a small rotational force.  It's usually too weak to overcome friction, which is why screws remain done up most of the time.


    Where a screw is subjects to a lot of vibration, something else is needed to keep it done up, perhaps a nylok nut or star washer.  Thermal expansion and contraction has the same effect, but much slower.


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