17-4 PH® Stainless Steel is a martensitic precipitation-hardening stainless steel, with high strength and hardness, resistance to corrosion, and excellent mechanical properties. It is the most widely used of all the precipitation-hardening stainless steels. (Registered trademark of AK Steel)Help eliminate flange leakage with BelleFlex® flange bolting. Leaks occur by bolt stretch, gasket creep, cycles of thermal change, etc. However, by maintaining load on bolted joints, leakage is greatly reduced, if not eliminated. The load values listed in the table below are according to the calculated theoretical load curve based on the dimensions and material for each part number.
| Part Number | Stud Size | OD | ID | THK | DISH | OAH | Spec Flat Load (lbf) | Torque (ft-lb) |
|---|---|---|---|---|---|---|---|---|
| FB1-15-4 | 1/2" | 0.926 | 0.513 | 0.086 | 0.015 | 0.101 | 2154 | 15 |
| FB1-25-4 | 1/2" | 0.926 | 0.513 | 0.11 | 0.012 | 0.122 | 3607 | 25 |
| FB1-30-4 | 1/2" | 1.012 | 0.528 | 0.122 | 0.013 | 0.135 | 4270 | 30 |
| FB1-45-4 | 1/2" | 1.012 | 0.528 | 0.144 | 0.012 | 0.156 | 6482 | 45 |
| FB1-60-4 | 1/2" | 1.012 | 0.528 | 0.168 | 0.01 | 0.178 | 8578 | 60 |
| FB2-15-4 | 5/8" | 1.149 | 0.641 | 0.107 | 0.019 | 0.126 | 3433 | 30 |
| FB2-25-4 | 5/8" | 1.149 | 0.641 | 0.14 | 0.014 | 0.154 | 5667 | 50 |
| FB2-30-4 | 5/8" | 1.146 | 0.642 | 0.152 | 0.013 | 0.165 | 6793 | 60 |
| FB2-45-4 | 5/8" | 1.146 | 0.642 | 0.184 | 0.011 | 0.195 | 10196 | 90 |
| FB2-60-4 | 5/8" | 1.146 | 0.624 | 0.209 | 0.01 | 0.219 | 13584 | 120 |
| FB3-15-4 | 3/4" | 1.371 | 0.763 | 0.13 | 0.022 | 0.152 | 4998 | 50 |
| FB3-25-4 | 3/4" | 1.371 | 0.763 | 0.168 | 0.017 | 0.185 | 8335 | 83 |
| FB3-30-4 | 3/4" | 1.37 | 0.762 | 0.183 | 0.016 | 0.199 | 10149 | 100 |
| FB3-45-4 | 3/4" | 1.37 | 0.762 | 0.224 | 0.013 | 0.237 | 15122 | 150 |
| FB3-60-4 | 3/4" | 1.37 | 0.762 | 0.253 | 0.012 | 0.265 | 20113 | 200 |
| FB4-15-4 | 7/8" | 1.591 | 0.892 | 0.153 | 0.025 | 0.178 | 6917 | 80 |
| FB4-25-4 | 7/8" | 1.591 | 0.892 | 0.199 | 0.019 | 0.218 | 11567 | 133 |
| FB4-30-4 | 7/8" | 1.588 | 0.891 | 0.215 | 0.018 | 0.233 | 13881 | 160 |
| FB4-45-4 | 7/8" | 1.588 | 0.891 | 0.262 | 0.015 | 0.277 | 20933 | 240 |
| FB4-60-4 | 7/8" | 1.588 | 0.891 | 0.302 | 0.013 | 0.315 | 27784 | 320 |
| FB5-15-4 | 1" | 1.811 | 1.021 | 0.176 | 0.028 | 0.204 | 9145 | 123 |
| FB5-25-4 | 1" | 1.811 | 1.021 | 0.226 | 0.022 | 0.248 | 15213 | 204 |
| FB5-30-4 | 1" | 1.807 | 1.023 | 0.243 | 0.021 | 0.264 | 18197 | 245 |
| FB5-45-4 | 1" | 1.807 | 1.023 | 0.299 | 0.017 | 0.316 | 27442 | 368 |
| FB5-60-4 | 1" | 1.807 | 1.023 | 0.343 | 0.015 | 0.358 | 36554 | 490 |
| FB6-15-4 | 1-1/8" | 2.026 | 1.146 | 0.2 | 0.031 | 0.231 | 11905 | 178 |
| FB6-25-4 | 1-1/8" | 2.026 | 1.146 | 0.258 | 0.024 | 0.282 | 19785 | 296 |
| FB6-30-4 | 1-1/8" | 2.02 | 1.145 | 0.278 | 0.023 | 0.301 | 23906 | 355 |
| FB6-45-4 | 1-1/8" | 2.02 | 1.145 | 0.339 | 0.019 | 0.358 | 35809 | 533 |
| FB6-60-4 | 1-1/8" | 2.02 | 1.145 | 0.395 | 0.016 | 0.411 | 47703 | 710 |
| FB7-15-4 | 1-1/4" | 2.311 | 1.272 | 0.226 | 0.036 | 0.262 | 14988 | 250 |
| FB7-25-4 | 1-1/4" | 2.311 | 1.271 | 0.292 | 0.028 | 0.32 | 25143 | 417 |
| FB7-30-4 | 1-1/4" | 2.31 | 1.27 | 0.314 | 0.027 | 0.341 | 30147 | 500 |
| FB7-45-4 | 1-1/4" | 2.31 | 1.27 | 0.385 | 0.022 | 0.407 | 45279 | 750 |
| FB7-60-4 | 1-1/4" | 2.31 | 1.27 | 0.445 | 0.019 | 0.464 | 60384 | 1000 |
| FB8-15-4 | 1-3/8" | 2.471 | 1.401 | 0.249 | 0.037 | 0.286 | 18471 | 340 |
| FB8-25-4 | 1-3/8" | 2.471 | 1.401 | 0.325 | 0.028 | 0.353 | 31081 | 567 |
| FB8-30-4 | 1-3/8" | 2.47 | 1.401 | 0.349 | 0.027 | 0.376 | 37157 | 680 |
| FB8-45-4 | 1-3/8" | 2.47 | 1.401 | 0.427 | 0.022 | 0.449 | 55450 | 1020 |
| FB8-60-4 | 1-3/8" | 2.47 | 1.401 | 0.494 | 0.019 | 0.513 | 74154 | 1360 |
| FB9-15-4 | 1-1/2" | 2.681 | 1.525 | 0.276 | 0.039 | 0.315 | 22588 | 400 |
| FB9-30-4 | 1-1/2" | 2.681 | 1.525 | 0.353 | 0.031 | 0.384 | 37564 | 667 |
| FB9-30-4 | 1-1/2" | 2.678 | 1.527 | 0.382 | 0.029 | 0.411 | 44728 | 800 |
| FB9-45-4 | 1-1/2" | 2.678 | 1.527 | 0.466 | 0.024 | 0.49 | 67199 | 1200 |
| FB9-60-4 | 1-1/2" | 2.678 | 1.527 | 0.536 | 0.021 | 0.557 | 89476 | 1600 |
| FB10-15-4 | 1-5/8" | 2.953 | 1.652 | 0.303 | 0.043 | 0.346 | 26775 | 550 |
| FB10-25-4 | 1-5/8" | 2.953 | 1.652 | 0.389 | 0.034 | 0.423 | 44798 | 917 |
| FB10-30-4 | 1-5/8" | 2.948 | 1.648 | 0.417 | 0.033 | 0.45 | 53711 | 1100 |
| FB10-45-4 | 1-5/8" | 2.948 | 1.648 | 0.51 | 0.027 | 0.537 | 80392 | 1650 |
| FB10-60-4 | 1-5/8" | 2.948 | 1.648 | 0.592 | 0.023 | 0.615 | 107110 | 2200 |
| FB11-15-4 | 1-3/4" | 3.172 | 1.778 | 0.325 | 0.047 | 0.372 | 31351 | 750 |
| FB11-25-4 | 1-3/4" | 3.172 | 1.778 | 0.421 | 0.036 | 0.457 | 52198 | 1250 |
| FB11-30-4 | 1-3/4" | 3.168 | 1.776 | 0.451 | 0.035 | 0.486 | 62553 | 1500 |
| FB11-45-4 | 1-3/4" | 3.168 | 1.776 | 0.55 | 0.029 | 0.579 | 94002 | 2250 |
| FB11-60-4 | 1-3/4" | 3.168 | 1.776 | 0.636 | 0.025 | 0.661 | 125304 | 3000 |
| FB12-15-4 | 1-7/8" | 3.392 | 1.901 | 0.352 | 0.049 | 0.401 | 36310 | 1000 |
| FB12-25-4 | 1-7/8" | 3.392 | 1.901 | 0.454 | 0.038 | 0.492 | 60416 | 1667 |
| FB12-30-4 | 1-7/8" | 3.392 | 1.902 | 0.487 | 0.037 | 0.524 | 72641 | 2000 |
| FB12-45-4 | 1-7/8" | 3.392 | 1.902 | 0.597 | 0.03 | 0.627 | 108502 | 3000 |
| FB12-60-4 | 1-7/8" | 3.392 | 1.902 | 0.626 | 0.029 | 0.655 | 120924 | 4000 |
| FB13-15-4 | 2" | 3.601 | 2.03 | 0.378 | 0.051 | 0.429 | 41733 | 1100 |
| FB13-25-4 | 2" | 3.601 | 2.03 | 0.486 | 0.04 | 0.526 | 69566 | 1833 |
| FB13-30-4 | 2" | 3.6 | 2.025 | 0.521 | 0.039 | 0.56 | 83452 | 2200 |
| FB13-45-4 | 2" | 3.6 | 2.025 | 0.637 | 0.032 | 0.669 | 125149 | 3300 |
| FB13-60-4 | 2" | 3.6 | 2.025 | 0.674 | 0.03 | 0.704 | 138983 | 4400 |
| FB14-15-4 | 2-1/4" | 4.041 | 2.282 | 0.427 | 0.057 | 0.484 | 53470 | 1590 |
| FB14-25-4 | 2-1/4" | 4.041 | 2.282 | 0.552 | 0.044 | 0.596 | 89170 | 2650 |
| FB14-30-4 | 2-1/4" | 4.04 | 2.282 | 0.591 | 0.043 | 0.634 | 107026 | 3180 |
| FB14-45-4 | 2-1/4" | 4.04 | 2.282 | 0.724 | 0.035 | 0.759 | 160155 | 4770 |
| FB14-60-4 | 2-1/4" | 4.04 | 2.282 | 0.758 | 0.034 | 0.792 | 178543 | 6360 |
| FB15-15-4 | 2-1/2" | 4.484 | 2.529 | 0.479 | 0.062 | 0.541 | 66608 | 2200 |
| FB15-25-4 | 2-1/2" | 4.484 | 2.529 | 0.619 | 0.048 | 0.667 | 111286 | 3667 |
| FB15-30-4 | 2-1/2" | 4.482 | 2.53 | 0.657 | 0.048 | 0.705 | 133280 | 4400 |
| FB15-45-4 | 2-1/2" | 4.482 | 2.53 | 0.806 | 0.039 | 0.845 | 199940 | 6600 |
| FB15-60-4 | 2-1/2" | 4.482 | 2.53 | 0.85 | 0.037 | 0.887 | 222478 | 8800 |
| FB16-15-4 | 2-3/4" | 4.921 | 2.781 | 0.531 | 0.067 | 0.598 | 81556 | 2960 |
| FB16-25-4 | 2-3/4" | 4.921 | 2.781 | 0.685 | 0.052 | 0.737 | 135885 | 4933 |
| FB16-30-4 | 2-3/4" | 4.919 | 2.777 | 0.728 | 0.052 | 0.78 | 163102 | 5920 |
| FB16-45-4 | 2-3/4" | 4.919 | 2.777 | 0.895 | 0.042 | 0.937 | 244873 | 8880 |
| FB16-60-4 | 2-3/4" | 4.919 | 2.777 | 0.942 | 0.04 | 0.982 | 271816 | 11840 |
| FB17-15-4 | 3" | 5.361 | 3.031 | 0.58 | 0.073 | 0.653 | 97608 | 3860 |
| FB17-25-4 | 3" | 5.361 | 3.031 | 0.747 | 0.057 | 0.804 | 162823 | 6433 |
| FB17-30-4 | 3" | 5.36 | 3.03 | 0.794 | 0.057 | 0.851 | 195580 | 7720 |
| FB17-45-4 | 3" | 5.36 | 3.03 | 0.976 | 0.046 | 1.022 | 293153 | 11580 |
| FB17-60-4 | 3" | 5.36 | 3.03 | 1.026 | 0.044 | 1.07 | 325748 | 15440 |
| FB18-60-4 | 3-1/4" | 5.4 | 3.29 | 1.117 | 0.038 | 1.155 | 385055 | 19814 |
| FB19-60-4 | 3-1/2" | 6.135 | 3.53 | 1.207 | 0.048 | 1.255 | 448650 | 24863 |
| FB20-60-4 | 3-3/4" | 6.67 | 3.825 | 1.296 | 0.053 | 1.349 | 517230 | 30711 |
| FB21-60-4 | 4" | 7.135 | 4.05 | 1.625 | 0.049 | 1.674 | 816283 | 51698 |
* Torque values for sizes 1-1/8″ and larger are based on the 8-pitch thread series for flanged piping.
† 50,000 psi bolt stress