there is a great Metric Bolt Grade Markings and steel strength chart that shows the differences between stainless and alloy steel materials.
Of note, there are different A2 variations. Both A2-70 and A2-80 may be called A2, but A2-70 (700 Mpa) and A2-80 (800 Mpa) vary by almost 15% in absolute strength.
https://monsterbolts.com/pages/metric-bolt-grades
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