DIN 931-1 > DIN EN ISO 4014
| Old norm | DIN 931 | M 1,6 to M 39 hexagon head bolts; product grades A and B |
| Current norm: | DIN EN ISO 4014 | Hexagon head bolts - Product grades A and B |
| Current release: 2011-06 | ||
| Changes: | converted to ISO wrench sizes (M10, M12, M14 and M22) Norm revised editorially |
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| Comment: | besides converted wrench sizes interchangeable | |
