21 Backnut (P4)
blue chromate
thick layer passivated
black chromate
| Size (in inch) | a | D2 | e | m | s |
|---|---|---|---|---|---|
| 1/8 | 1 | 18 | 21 | 6 | 19 |
| 1/4 | 1 | 20 | 24 | 6 | 22 |
| 3/8 | 1 | 25 | 30 | 7 | 27 |
| 1/2 | 1,5 | 30 | 35 | 8 | 32 |
| 3/4 | 1,5 | 33 | 40 | 9 | 36 |
| 1 | 1,5 | 43 | 51 | 10 | 46 |
| 1 1/4 | 2 | 52 | 61 | 11 | 55 |
| 1 1/2 | 2 | 56 | 67 | 12 | 60 |
| 2 | 2 | 70 | 83 | 13 | 75 |
| 2 1/2 | 2 | 90 | 105,8 | 16 | 95 |
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