John Evans' Sons

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John Evans' Sons LLC stands as America's oldest spring manufacturer, founded in 1850 and delivering precision-engineered springs, wire forms, and mechanical assemblies for over 175 years. Based in Lansdale, Pennsylvania, the company specializes in custom spring engineering and manufacturing solutions for demanding industrial applications. The company's comprehensive product portfolio includes constant force springs, spiral torsion springs, power springs, vibration isolators, wire forms, stampings/flat springs, spring reels, torsion leaf springs, mechanical assemblies, and helical springs. Their engineering team brings deep expertise to the design and development of custom and high-volume precision spring components, tackling challenging, complex, and high-performance applications that push the boundaries of innovation. John Evans' Sons serves diverse industries including medical devices, aerospace, military/defense, window manufacturing, electric motors, robotics, point of purchase displays, trucking, and elevator systems. The company maintains rigorous quality standards with ISO 9001:2015, ISO 13485:2016, and AS9100 certifications, ensuring compliance with aerospace, medical, and defense industry requirements. Their expertise in constant force spring technology has resulted in the production of over 100 million high-performance window balance products, establishing them as a world leader in this specialized field.

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