Dzus fastener

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The Dzus fasteners (gold coloured circular objects) fastening the cowling panels of the 1930s Hawker Hind

Dzus (pronounced Zooss[citation needed]) is a proprietary name for a type of quarter-turn fastener often used to secure skin panels on aircraft.

It was invented and patented by a native Ukrainian William Dzus (Volodymyr Dzhus) in the early 1930s. Quarter-turn fasteners are used to secure panels in equipment, airplanes, motorcycles, and racing cars that must be removed often and/or quickly.[1] These fasteners are notable in that they are of an "over-center" design, requiring positive sustained torque to unfasten. Thus, any minor disturbance to the fastener will correct itself rather than proceed to further loosening as it would in threaded fasteners.

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