Official Answer
Answer
Unlike standard coil springs, wave springs are rarely inspected at free height because the 'wave' shape is difficult to measure repeatably. The primary inspection parameter is the 'Load at Work Height'. This is measured by compressing the spring to a specific axial dimension $H_1$ and recording the force $P_1$. A second point $H_2$ is often measured to verify the spring rate $k = \frac{P_2 - P_1}{H_1 - H_2}$. Additionally, 'Radial Wall' and 'Wire Thickness' are inspected via micrometers, and the 'Gap' (for gap-type springs) or 'Overlap' (for overlap-type) is checked to ensure no interference occurs during full compression.
