| Old norm | DIN 933 | M 1,6 to M 52 hexagon head screws threaded up to the head; product grades A and B |
| Current norm: | DIN EN ISO 4017 | Hexagon head screws - Product grades A and B |
| Current release: 2011-07 | ||
| Changes: | converted to ISO wrench sizes (M10, M12, M14 and M22) Norm revised editorially |
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| Comment: | besides converted wrench sizes interchangeable | |
| Drawing: |  |
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| Ware groups: | ||
