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This part of ISO 898 specifies the mechanical properties of nuts with specified proof load values when tested at an ambient temperature range of + 10 °C to + 35 °C. Mechanical and physical properties will vary with respect to temperature and property class. Products conforming to the requirements of this part of ISO 898 are evaluated only at the ambient temperature range and may not retain the specified physical properties at higher and lower temperatures. At temperatures higher or lower than the ambient temperature range, a significant change in properties may occur. When fasteners are to be used above or below the ambient temperature range, it is the responsibility of the user to ensure that the mechanical and physical properties are suitable for his particular service conditions.
| Property class | Chemical composition limits (check analysis), % | ||||
|---|---|---|---|---|---|
| c max. | Mn min. | p max. | s max. | ||
| 5a; 6 | – | 0,50 | – | 0,060 | 0,150 |
| 8b | 04a | 0,58 | 0,25 | 0,060 | 0,150 |
| 10b | 05b | 0,58 | 0,30 | 0,048 | 0,058 |
| 12b | – | 0,58 | 0,45 | 0,048 | 0,058 |
a. Nuts of this property class may be manufactured from
free-cutting steel unless otherwise agreed between the
purchaser and the manufacturer. In such cases, the following
maximum sulfur, phosphorus and lead contents are
permissible:
sulfur 0,34 %; phosphorus 0,11 %; lead 0,35 %.
b. Alloying elements may be added, if necessary, to develop the
mechanical properties of the nuts.
| Nominal thread d iameter d mm | Property class | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 04 | O5 | 5 | ||||||||||||||
| Stress under proof load, SP N/mm2 | Vickers hardness, HV | Nut | Stress under proof load, SP N/mm2 | Vickers hardness, HV | Nut | Stress under proof load, SP N/mm2 | Vickers hardness, J·rv | Nut. | ||||||||
| min. | ma.x. | state | style | min. | max. | state | style | min. | max. | state | style | |||||
| 8≤d ≤ 16 | 380 | 188 | 302 | NQTa | thin | 500 | 272 | 353 | QTb | thin | 690 | 175 | 302 | NQTa | 1 | |
| 16≤ d ≤ 39 | 720 | 190 | ||||||||||||||
| Nominal thread d iameter d mm | Property class | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 | 8 | |||||||||||||||
| Stress under proof load, Sp N/mm2 | Vickers hardness, HV | Nut | Stress under proof load, Sp N/mm2 | Vickers hardness, HV | Nut | Stress under proof load, Sp N/mm2 | Vickers hardness, l·IV | Nut | ||||||||
| min. | max. | state | style | min. | max. | state | style | min. | max. | state | style | |||||
| 8 ≤ d ≤ 10 | 770 | 188 | 302 | NQTac | 1 | 955 | 250 | 353 | QTb | 1 | 890 | 195 | 302 | NQTa | 2 | |
| 10 < d ≤ 16 | 780 | |||||||||||||||
| 16 < d ≤ 33 | 870 | 233 | 1030 | 295 | – | – | – | |||||||||
| 33 < d ≤ 39 | 930 | 1090 | – | |||||||||||||
| Nominal thread d iameter d mm |
Property class | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 12 | |||||||||||||||
| Stress under proof load, Sp N/mm2 |
Vickers hardness, HV | Nut | Stress under proof load, Sp N/mm2 |
Vickers hardness, HV | Nut | Stress under proof load, Sp N/mm2 |
Vickers hardness, l·IV | Nut | ||||||||
| min. | max. | state | style | min. | max. | state | style | min. | max. | state | style | |||||
| 8 ≤ d ≤ 10 | 1100 | 295 | 353 | QTb | 1 | 1055 | 250 | 353 | QTb | 2 | 1200 | 295 | 353 | QTb | 2 |
|
| 10 < d ≤ 16 | 1100 | |||||||||||||||
| 16 < d ≤ 39 | – | – | 1080 | 260 | – | – | – | |||||||||
| – | – | – | – | – | ||||||||||||
Note:
Minimum hardness is mandatory only for heat-treated nuts and nuts too large to be proof-load tested. For all other nuts, minimum hardness is not mandatory but is provided
for guidance only. For nuts which are not hardened and tempered, and which satisfy the proof-load test, minimum hardness shall not be cause for rejection.
a. NQT = Not quenched and tempered.
b. QT = Quenched and tempered.
c. Nuts with nominal thread diameters d > 16 mm may be quenched and tempered at the discretion of the manufacturer.
| Thread d x P | Nominal stress area of mandrel As | Property class 06 6 6 8 10 12 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 04 | 05 | 5 | 6 | 8 | 10 | 12 | ||||
| Proof load (As x Sp) N | ||||||||||
| mm2 | style l | style 1 | style l | style 2 | style 1 | style 2 | style 2 | |||
| M8 x l MlO x 1 MlO x 1,25 | 39,2 64,5 61,2 | 14 900 24 500 23 300 | 19 600 32 200 30 600 | 27 000 44 500 44 200 | 30 200 49 700 47 100 | 37 400 61 600 58 400 | 34 900 57 400 54 500 | 43 100 71 000 67 300 | 41 400 68 000 64 600 | 47 000 77 400 73 400 |
| M12 x 1,25 Ml2 x 1,5 Ml4 x 1,5 | 92,1 88,1 125 | 35 000 33 500 47 500 | 46 000 44 000 62 500 | 63 500 60 800 86 300 | 71 800 68 700 97 500 | 88 000 84 100 119 400 | 82 000 78 400 111 200 | 102 200 97 800 138 800 | 97 200 92 900 131 900 | 110 500 105700 150 000 |
| Ml6 x 1,5 Ml8 x 1,5 M18 X 2 | 167 215 204 | 63 500 81700 77 500 | 83 500 107 500 102 000 | 115 200 154 800 146 900 | 130 300 187 000 177 500 | 159 500 221500 210 100 | 148 600 – – | 185 400 – – | 176 200 232 200 220 300 | 200 400 – – |
| M20 x 1,5 M20 X 2 M22 x 1,5 | 272 258 333 | 103400 98000 126 500 | 136 000 129 000 166 500 | 195 800 185 800 239 800 | 236 600 224 500 289 700 | 280 200 265 700 343 000 | – – – | – – – | 293 800 278 600 359 600 | – – – |
| M22 X 2 M24 X 2 M27 X 2 | 318 384 496 | 120 800 145 900 188500 | 159 000 192 000 248 000 | 229 000 276 500 351 100 | 276 700 334 100 431 500 | 327 500 395 500 510 900 | – – – | – – – | 343 400 414 700 535 700 | – – – |
| M30 X 2 M33 X 2 M36 X 3 | 621 761 865 | 236 000 289 200 328700 | 310 500 380 500 432 500 | 447 100 547 900 622 800 | 540 300 662 100 804 400 | 639 600 783 800 942 800 | – – – | – – – | 670 700 821 900 934 200 | – – – |
| M39 X 3 | 1030 | 391400 | 515 000 | 741 600 | 957 900 | 1 123 000 | – | – | 1112 000 | – |