Metric Nuts - Proof Loads
Proof loads of metric nuts - coarse and fine threads according to ISO 898-1. Calculate and lookup proof loads for various thread sizes and property classes.
Calculator
Inputs
Results
Proof Load - Fp-- N
| Thread d (mm) | Pitch P (mm) | Class 5 | Class 6 | Class 8 | Class 9 | Class 10 | Class 12 |
|---|---|---|---|---|---|---|---|
| M5 | 0.80 | 5400 | 7100 | 8250 | 9500 | 12140 | 13000 |
| M6 | 1.00 | 7640 | 10000 | 11700 | 13500 | 17200 | 18400 |
| M7 | 1.00 | 11000 | 14500 | 16800 | 19400 | 24700 | 26400 |
| M8 | 1.25 | 13900 | 18300 | 21600 | 24900 | 31800 | 34400 |
| M10 | 1.50 | 22000 | 29000 | 34200 | 39400 | 50500 | 54500 |
| M12 | 1.75 | 32000 | 42200 | 51400 | 59000 | 74200 | 80100 |
| M14 | 2.00 | 43700 | 57500 | 70200 | 80500 | 101200 | 109300 |
| M16 | 2.00 | 59700 | 78500 | 95800 | 109900 | 138200 | 149200 |
| M18 | 2.50 | 73000 | 96000 | 121000 | 138200 | 176600 | 176600 |
| M20 | 2.50 | 93100 | 122500 | 154400 | 176400 | 225400 | 225400 |
| M22 | 2.50 | 115000 | 151500 | 190900 | 218200 | 278800 | 278800 |
| M24 | 3.00 | 134100 | 176500 | 222400 | 254200 | 324800 | 324800 |
| M27 | 3.00 | 174400 | 229500 | 289200 | 330500 | 422300 | 422300 |
| M30 | 3.50 | 213200 | 280500 | 353400 | 403900 | 516100 | 516100 |
| M33 | 3.50 | 263700 | 347000 | 437200 | 499700 | 638500 | 638500 |
| M36 | 4.00 | 310500 | 408500 | 514700 | 588200 | 751600 | 751600 |
| M39 | 4.00 | 370900 | 488000 | 614900 | 702700 | 897900 | 897900 |
| Thread d (mm) | Pitch P (mm) | Class 5 | Class 6 | Class 8 | Class 10 | Class 12 |
|---|---|---|---|---|---|---|
| M8 | 1.00 | 14900 | 19600 | 27000 | 37400 | 43100 |
| M10 | 1.25 | 23300 | 30600 | 44200 | 58400 | 67300 |
| M10 | 1.00 | 24500 | 32200 | 44500 | 61600 | 71000 |
| M12 | 1.50 | 33500 | 44000 | 60800 | 84100 | 97800 |
| M12 | 1.25 | 35000 | 46000 | 63500 | 88000 | 102200 |
| M14 | 1.50 | 47500 | 62500 | 86300 | 119400 | 138800 |
| M16 | 1.50 | 63500 | 83500 | 115200 | 159500 | 185400 |
| M18 | 2.00 | 77500 | 102000 | 146900 | 210100 | 220300 |
| M18 | 1.50 | 81700 | 107500 | 154800 | 221500 | 232200 |
| M20 | 2.00 | 98000 | 129000 | 185800 | 265700 | 278600 |
| M20 | 1.50 | 103400 | 136000 | 195800 | 280200 | 293800 |
| M22 | 2.00 | 120800 | 159000 | 229000 | 327500 | 343400 |
| M22 | 1.50 | 126500 | 166500 | 239800 | 343000 | 359600 |
| M24 | 2.00 | 145900 | 192000 | 276500 | 395500 | 414700 |
| M27 | 2.00 | 188500 | 248000 | 351100 | 510900 | 535700 |
| M30 | 2.00 | 236000 | 310500 | 447100 | 639600 | 670700 |
| M33 | 2.00 | 289200 | 380500 | 547900 | 783800 | 821900 |
| M36 | 3.00 | 328700 | 432500 | 622800 | 942800 | 934200 |
| M39 | 3.00 | 391400 | 515000 | 741600 | 1123000 | 1112000 |