Story: Building materials

Screw heads and drivers

Screw heads and drivers

The heads of traditional wood screws were originally slotted (left), with a recessed groove in the surface. In 1908 a square-drive screw head was invented (mid-left), followed in the 1930s by the Phillips head screw (mid-right). The hexagonal-head Allen key (right) was invented in 1900.

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Photograph by Carl Walrond

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How to cite this page:

Jeremy Salmond, 'Building materials - Ironmongery', Te Ara - the Encyclopedia of New Zealand, (accessed 27 June 2022)

Story by Jeremy Salmond, published 11 Mar 2010