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Class 12.9 bolt has the highest percentage of carbon among all bolt materials and has had heating and tempering process on its rod prior to production. Class 12.0 bolt has 1220 Mpa Tensile, 1100 Mpa Yield stress and 38-44 Rockwell hardness. Class 12.9 bolt is manufactured following ASTM F568 standard.
Class 12.9 bolt has a very high strength and is very brittle. It is assembled along with Class 12 nut. This class of bolt can withstand 120 kgs load per square millimeter and will remain in elastic stage under 90 percent of this load. Class 12.9 bolts are usually used in heavy industries like bridge and dam construction.
| N Load in Elastic Area | Proof load N | Proof load Kg | Effective Area mm^2 | mm Minor Diameter | mm Major Diameter | Bolt Class |
|---|---|---|---|---|---|---|
| 13434 | 14926 | 1521.6 | 12.68 | 4.019 | M5 | 12.9 |
| 18787 | 20875 | 2127.96 | 17.733 | 4.773 | M6 | 12.9 |
| 34772 | 38635 | 3938.4 | 32.82 | 6.466 | M8 | 12.9 |
| 55368 | 61520 | 6271 | 52.26 | 8.16 | M10 | 12.9 |
| 80742 | 89714 | 9145 | 76.21 | 9.853 | M12 | 12.9 |
| 110863 | 123182 | 12556 | 104.64 | 11.546 | M14 | 12.9 |
| 152607 | 169563 | 17284.8 | 144.04 | 13.546 | M16 | 12.9 |
| 186955 | 207728 | 21175.2 | 176.46 | 14.993 | M18 | 12.9 |
| 239304 | 265894 | 27104.4 | 225.87 | 16.993 | M20 | 12.9 |
| 300012 | 333347 | 33980.4 | 283.17 | 18.993 | M22 | 12.9 |
| 343377 | 381530 | 38892 | 324.1 | 20.319 | M24 | 12.9 |
| 549573 | 610637 | 62246.4 | 518.72 | 25.706 | M30 | 12.9 |
| 804060 | 893400 | 91070 | 758.92 | 31.093 | M36 | 12.9 |
| 1106732 | 1229703 | 125352 | 1044.6 | 36.479 | M42 | 12.9 |
