The Straub Open Flex couplings are designed to join just about any plain end pipe. The coupling has been designed with expansion and contraction movement in mind, as well as angular deflection. The coupling is designed as an alternative to metal and rubber expansion joints. The coupling features a split case to allow for an easier installation if you are unable to slip the coupling over the pipe end.
| HydroMet Code | Pipe OD (mm) | Clamping Range (mm) | PS Bar | LS | PS Bar | LU | Torque (Nm) | LS | Torque (Nm) | LU |
|---|---|---|---|---|---|---|
| 180 | 178 – 182 | 16.5 | 25 | 15 | 30 | |
| 200 | 198 – 202 | 15 | 25 | 15 | 30 | |
| 204 | 202 – 206 | 13.5 | 25 | 15 | 30 | |
| 219.1 | 217 – 222 | 13.5 | 25 | 15 | 30 | |
| 235 | 233 – 237 | 12 | 24 | 15 | 30 | |
| 250 | 248 – 253 | 12 | 24 | 15 | 30 | |
| 254 | 252 – 257 | 11 | 22.5 | 15 | 30 | |
| 267 | 264 – 270 | 11 | 22.5 | 15 | 30 | |
| 273 | 270 – 276 | 11 | 22 | 15 | 30 | |
| 304 | 301 – 307 | 10 | 19.5 | 20 | 30 | |
| 317 | 314 – 320 | 9.5 | 18.5 | 20 | 30 | |
| 323.9 | 321 – 327 | 9.5 | 18.5 | 20 | 30 | |
| 355.6 | 353 – 358 | 8.5 | 17 | 20 | 30 | |
| 406.4 | 404 – 409 | 7.5 | 15 | 20 | 30 | |
| 457.2 | 454 – 460 | 6.5 | 13 | 20 | 40 | |
| 508 | 505 – 511 | 6 | 12 | 25 | 40 | |
| 558.8 | 556 – 562 | 5.5 | 10.5 | 25 | 40 | |
| 560 | 557 – 563 | 5 | 10 | 25 | 40 | |
| 587 | 584 – 590 | 5 | 10 | 25 | 40 | |
| 609.6 | 606 – 613 | 5 | 10 | 25 | 40 | |
| 667 | 664 – 671 | 4 | 8.5 | 30 | 40 | |
| 711.2 | 708 – 715 | 4 | 8.5 | 30 | 50 | |
| 762 | 758 – 766 | 4 | 8 | 30 | 50 | |
| 812.8 | 809 – 817 | 3.5 | 7.5 | 30 | 50 | |
| 826 | 822 – 830 | 3.5 | 6.5 | 35 | 50 | |
| 914.4 | 910 – 918 | 3.5 | 6.5 | 35 | 60 | |
| 924 | 920 – 928 | 3 | 6 | 35 | 60 | |
| 1016 | 1012 – 1020 | 3 | 6 | 35 | 60 | |
| 1026 | 1022 – 1300 | 2.5 | 6 | 40 | 60 | |
| 1117 | 1114 – 1122 | 2.5 | 5.5 | 40 | 60 | |
| 1219.2 | 1215 – 1224 | 2.5 | 5 | 40 | 60 | |
| 1229 | 1225 – 1234 | 2.5 | 5 | 40 | 60 |