In modern aviation, designers constantly pursue weight reductions to improve fuel efficiency, enhance performance and lower operational costs. A significant contributor to this effort is the use of lightweight fasteners, small components that play a pivotal role in making aircraft lighter without compromising structural integrity or safety. The Role of Lightweight Fasteners in Aircraft Design Aircraft are complex systems composed of thousands of parts that must work together under extreme conditions. Traditional metal fasteners like steel bolts and nuts have been the standard for decades. However, the demand for lighter alternatives (due to fuel efficiency and performance goals) has spurred the development of advanced materials and methods that balance strength and weight reduction. Lightweight fasteners, such as those made from