A metal tube crimped over stranded wire to secure it within a screw terminal usually with electrical insulation protecting any exposed portion of the wire not completely inside the screw terminal post.
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Compression fittings for attaching tubing (piping) commonly have ferrules in them.
ferrule |
By 1905, the workshops around the courtyard of Leah’s Yard were occupied by eighteen Little mesters whose trades included dram flask manufacturer, hollow ware and silver buffers, palette knife makers, steel fork manufacturer, silver ferrule maker, brass and nickel silver turners, electroplate producer and a cutler.