Bumax Stainless Steel Fasteners
| Composition and corrosion resistance data | |
|---|---|
| Steel Grade | Acid Resistant |
| Designation: 7) | |
| ISO group | A4 |
| ISO No. | 20a |
| Bulten Stainless | Bumax |
| SS 14. | 2343 |
| Avesta | 832 SK |
| Fagersta | P440 |
| Sandvik | 5R60 |
| Uddeholm | 24 |
| EN Name 1) | X3CrNiMo 17133 |
| EN 10027-2 | 1.4436 |
| USA (AISI) 1) | - |
| U K (BS) 1) | - |
| France (AFNOP) 1) | Z6CND 17-12 |
| Italy (UNI) 1) | X5CrNiMo 1713 |
| Japan (JIS) 1) | - |
| Chemical Composition | |
| Carbon C % | max. 0.03 |
| Chromium Cr % | 16.5-18.5 |
| Nickel Ni % | 11.0 – 14.5 |
| Molybdenum Mo % | 2.5-3.0 |
| Cuppar Cu % | - |
| Stabiliser Ti/Nb % | - |
| Structure | Austenitic |
| Physical Data | |
| Magnetic | No |
| Scalling temperature. In air appr °C | 850 |
| Machining Properties | |
| Hardenabillity | No |
| Weldabillity | Excellent (5) |
| Notes | |
| Used in the cellul-lose and in Pulp & Paper industry. The low carbon and the increased content of Cr. Ni and Mo gives the steel excellent resistance to corrosion. |
|
Bumax Stainless Steel Fasteners - Tightening Data
| Thread size and class | Class | M3 | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tightening Torque * *** | Bumax 109 | 1.7 | 4.1 | 8.1 | 14 | 34 | 66 | 115 | 162 | 248 | 344 | 481 |
| Bumax 88 | 1.3 | 2.9 | 5.7 | 10 | 25 | 47 | 82 | 129 | 198 | 275 | 385 | |
| Bumax Lock | 6.6 | 12 | 29 | 54 | 94 | 228 | 442 | |||||
| Preload applied KN ± 23% ** | Bumax 109 | 2.9 | 5.2 | 8.6 | 12 | 21 | 34 | 49 | 60 | 81 | 100 | 128 |
| Bumax 88 | 2.1 | 3.6 | 5.9 | 8.4 | 15 | 24 | 35 | 48 | 65 | 80 | 102 | |
| Bumax Lock | 8.4 | 15 | 24 | 35 | 65 | 102 | ||||||
| Failure load KN | Bumax 109 | 4.5 | 8 | 13 | 18 | 33 | 52 | 76 | 92 | 125 | 154 | 196 |
| Bumax 88 | 3.2 | 6 | 9 | 13 | 3 | 37 | 54 | 74 | 100 | 123 | 157 | |
| Bumax Lock | 9 | 13 | 23 | 37 | 54 | 100 | 157 | |||||
| Nominal stress area mm² | 5.03 | 8.78 | 14.2 | 20.1 | 36.6 | 58.0 | 84.3 | 115 | 157 | 192 | 245 | |
| Pitch of thread | 0.5 | 0.7 | 0.8 | 1.0 | 1.25 | 1.5 | 1.75 | 2.0 | 2.0 | 2.5 | 2.5 |
| Thread size and class | Class | M24 | M27 | M30 | M36 |
|---|---|---|---|---|---|
| Tightening Torque Mv in Nm * *** | Bumax 88 | 665 | 961 | 1310 | 2280 |
| Bumax Lock | 765 | ||||
| Preload applied KN ± 23% ** | Bumax 88 | 181 | 235 | 287 | 418 |
| Bumax Lock | 181 | ||||
| Failure load KN | Bumax 88 | 282 | 367 | 449 | 654 |
| Bumax Lock | 282 | ||||
| Yield Load KN | Bumax 88 | 226 | 294 | 359 | 523 |
| Bumax Lock | 226 | ||||
| Nominal stress area mm² | 353 | 459 | 561 | 817 | |
| Pitch of thread | 3.0 | 3.0 | 3.5 | 4.0 |
| Thread size and class | Class | 1/4-20 UNC | 5/16-18 UNC | 3/8-16 UNC | 1/2-13 UNC | 5/8-11 UNC | 3/4-10 UNC | 7/8-9 UNC | 1”-8 UNC |
|---|---|---|---|---|---|---|---|---|---|
| Tightening Torque Mv in Nm * *** | Bumax 88 | 11.0 | 22.0 | 39.0 | 95.0 | 188.0 | 329.0 | 527.0 | 789.0 |
| Preload applied KN ± 23% ** | Bumax 88 | 8.7 | 14.3 | 21.1 | 38.7 | 61.7 | 91.2 | 125.9 | 165.2 |
| Failure load KN | Bumax 88 | 17.0 | 28.0 | 41.5 | 75.9 | 121.0 | 179.0 | 247.0 | 325.0 |
| Yield Load KN | Bumax 88 | 13.1 | 22.4 | 33.2 | 60.8 | 96.9 | 143.4 | 197.9 | 259.6 |
| Nominal stress area mm² | 20.5 | 33.8 | 50.0 | 91.5 | 146.0 | 216.0 | 298.0 | 391.0 |
* The Mv recommendations refer to burr-free surfaces lubricated with a good quality lubricant.
** The preload applied is calculated as 65% of Rp 0.2 but in practice the value can be expected to vary between 50 – 80 %
*** The Mv-recommendations are calculated assuming a coefficient of friction of 0.16 which requires a good-quality lubricant.
Note: Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.