About this tool
The table covers the full SAE AS568 range (dash 001 through 475) — 349 published sizes, with the gaps filled in for completeness. Inch values are the original source; metric values are calculated by multiplying by 25.4 and rounded to 0.01 mm.
Sources: SAE AS568 (current revision), Parker O-Ring Handbook ORD 5700, cross-checked against Trelleborg, Apple Rubber, and Eriks catalogues.