Official Answer
Answer
The solid height $H_s$ is the physical limit of the spring's axial dimension under maximum load. For a crest-to-crest wave spring with $N$ turns and shim ends, the formula is $H_s = (N + 1) · t$, where $t$ is the material thickness. However, manufacturing tolerances on the flat wire thickness (typically $\pm 0.0005$ inches) and the wave height must be considered. In reality, the 'theoretical' solid height is rarely achieved due to wave nesting imperfections; thus, engineers use a 'measured' solid height which is often 1.1 times the theoretical value. If the application requires a precise hard stop, the shim ends must be ground to a specific parallelism tolerance, often within $0.002$ inches TIR (Total Indicator Reading).
