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Bolts are often made of steel, and where resistance is required to weather or corrosion, they may be galvanised, or stainless steel, brass, zinc or titanium may be used. The bolt consists of a head and a cylindrical body with screw threads along a portion of its length. The nut is the female member of the pair, having internal threads to match those of the bolt. Washers are often used to prevent loosening and crushing.
