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In 1798, American David Wilkinson also invented machinery for the mass production of threaded metal screws. Twenty-eight years before Henry Phillips patented his Phillips head screws, which are also square-drive screws.

In 1908, square-drive screws were invented by Canadian P. The Robertson screw is considered the "first recess-drive type fastener practical for production usage." The design became a North American standard, as published in the sixth edition of Industrial Fasteners Institute Metric and Inch Standards.

Mary Bellis, known by some as Calm X, was an experimental artist, film director and producer, video game content creator, and freelance writer for some 18 years.

She specialized in writing about inventors and inventions, in particular. A screw is any shaft with a corkscrew-shaped groove formed on its surface. A screwdriver is a tool for driving (turning) screws; screwdrivers have a tip that fits into the head of a screw.

The hand-tool for driving cap screws and other types is called a spanner (U. We share our reference material free of charge and work hard to make it accurate, but as with any research, mistakes can be made.We are not responsible for the use you make of the information here or the honest mistakes that may occur from time to time.A variety of tools exists to drive screws into the material to be fixed. The hand tools used to drive slot-headed and cross-headed screws are called screwdrivers.

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