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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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  • 0
    Wheel nuts are very carefully designed with a cone shaped area of contact between the wheel and the nut or bolt head, so that there is plenty of friction at the largest possible radius, and the design is self centring so that the circle of contact is more or less guaranteed to be complete. A normal nut is flat, or may be slightly high in the centre and that means that there need not be a large area of contact. On a car with studs and nuts, if you put the nuts on backwards, so the conical surfaces are facing out, or use ordinary nuts of the same thread, instead of the mating ones, it soon comes undone, and chews the thread on the studs as a bonus,


    More importantly to the BS951 clamp, the thing the nut is pressing against is bent up from flat stock, and is not re-finished, so the surface quality is not guaranteed, and the tolerances on the threading are such the bolt may be anything between quite tight or finger loose. They are made to a price, and as such the tolerancing is not great.
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  • 0
    Wheel nuts are very carefully designed with a cone shaped area of contact between the wheel and the nut or bolt head, so that there is plenty of friction at the largest possible radius, and the design is self centring so that the circle of contact is more or less guaranteed to be complete. A normal nut is flat, or may be slightly high in the centre and that means that there need not be a large area of contact. On a car with studs and nuts, if you put the nuts on backwards, so the conical surfaces are facing out, or use ordinary nuts of the same thread, instead of the mating ones, it soon comes undone, and chews the thread on the studs as a bonus,


    More importantly to the BS951 clamp, the thing the nut is pressing against is bent up from flat stock, and is not re-finished, so the surface quality is not guaranteed, and the tolerances on the threading are such the bolt may be anything between quite tight or finger loose. They are made to a price, and as such the tolerancing is not great.
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