Lightening holes (often spelled "lightening holes") are cutouts made in structural elements, typically in aerospace and automotive engineering, to reduce weight without compromising structural integrity. These holes are strategically placed to remove excess material in components such as wings, fuselages, or chassis while still maintaining the necessary strength and stiffness. The primary purpose of lightening holes is to make products lighter, which can lead to improved fuel efficiency, better performance, and reduced material costs.
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