Terminal fittings for insulators
The metal fittings which terminate ceramic insulators are almost always made from ferrous material. An exception is bushing shells, the flanges of which must not be of magnetic material. Caps and flanges are cast. The principal materials here are malleable iron, spheroidal graphitic or ductile iron. Pins, to be buried in cement within the ceramic parts of discs or pedestal posts, are more highly stressed mechanically than caps and are almost always forged from steel.
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