To support ASML’s development of high-precision lithography systems, this project quantified the bending stiffness of a flat conductor cable (FCC) subjected to extreme dynamic acceleration. Analytical methods alone were insufficient due to the cable’s complex geometry. A four-point bend test was designed for static analysis, while a dynamic test fixture simulated in-service conditions using a fixed-fixed semicircular setup with force sensing. Static testing yielded an average bending stiffness of 2.605 × 10⁵ N·mm², while dynamic trials returned 1.419 × 10⁵ N·mm². The agreement between methods validated the experimental setups. These results provide ASML with actionable mechanical data to improve cable reliability, minimize wear, and enhance performance under high-stress operating conditions.