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| UNI 6592 DIN 125 | 
| | RONDELLE PIANE | grezze o zincate | | d | per viti | D | S | | 3.2 | M 3 | 7 | 0.5 | | 4.3 | M 4 | 9 | 0.8 | | 5.3 | M 5 | 10 | 1 | | 6.4 | M 6 | 12.5 | 1.6 | | 8.4 | M 8 | 17 | 1.6 | | 10.5 | M 10 | 21 | 2 | | 13 | M 12 | 24 | 2.5 | | 15 | M 14 | 28 | 2.5 | | 17 | M 16 | 30 | 3 | | 19 | M 18 | 34 | 3 | | 21 | M 20 | 37 | 3 | | 23 | M 22 | 39 | 3 | | 25 | M 24 | 44 | 4 | | 28 | M 27 | 50 | 4 | | 31 | M 30 | 56 | 4 |
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