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Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood. Twinfast screw: A Twinfast screw is a type of screw with two threads (i.e. a twin-start screw), so that it can be driven twice as fast as a normal (i.e. single-start) screw with the same pitch. [4]
Both the barrel and screw have heads designed to clamp (bind) material between the head of the barrel and the head of the screw, or to bridge the gap between two parts. Other names for sex bolts, or (in some cases) for the female half specifically, include: architectural bolts, [1] barrel bolts, [citation needed] barrel nuts, [2] binding ...
Football nose armor as depicted in The Daily Review (Decatur, Illinois) of December 4, 1892. In the days before helmets, players often wore nose guards or "nose masks" or "nose armor". [9] Football was a brutal sport before the introduction of helmets and other protective gear. Serious injuries and even deaths were common occurrences in the game.
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Hook-and-loop fasteners, commonly known as Velcro (a genericized trademark), hook-and-pile fasteners or touch fasteners are versatile fastening devices that allow two surfaces to be repeatedly attached and detached with ease. Invented in the mid-20th century, they are widely used in clothing, accessories, and various industrial and consumer ...