
When it comes to the origin of the Allen wrench, we must start with the
Allen screws. In some non-English-speaking countries in Europe, people call
"Allen key" "Unbrako key". This "Unbrako" is actually the earliest brand of
hexagon socket screws, founded by SPS (Standard Pressed Steel Company) in the
United States around 1911. SPS company imported a kind of socket head screw from
the United Kingdom earlier, but the price is very expensive. In order to save
costs, SPS company decided to produce it by itself. H. T. Hallowell, founder of
SPS, said in his memoir: "We started trying to make some screws with square
holes like the ones in the UK, but soon found out that they would not be
accepted in the US. So we decided to add six screws to the screws. Angular
hole." Hallowell's explanation of this history is vague, but it is speculated
that SPS was modified to avoid patent disputes with socket head screws. In
short, the SPS company began to produce this new hexagon socket head screw, and
registered a trademark called "Unbrako", taken from the homonym of
"unbreakable", which means "unbreakable". Later, the socket head cap screws
gradually replaced the socket head cap screws and became the new industry
standard, and are widely used in the manufacturing industries such as
automobiles, aircraft, machinery and furniture.
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