The formal name of quincunx screw is iso10664 screw or hexagonal internal, also known as star socket screw. It is a kind of screw fastener developed and listed by camcar Textron in 1967. Because the trade name that Kangjia applied for a patent in that year was "X", it was also called "x screw". Quincunx screw is widely used in brake system, hard disk, computer system and consumer electronic products of automobiles, motorcycles and bicycles.
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