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The origin of the wrench
source:Industry News release time:2022-08-11 Article author:Rosit Popular:Air band saw
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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