Home > Products > Ductile Iron Backup Rings > Convoluted Backup Rings - 1/2" to 22"BUP-SDR Convoluted Deltaflex® Backup Ring - 1/2" to 22"
Ongoing engineering design efforts may affect the technical information listed in our publications.
| DIMENSIONS | Weight (lbs.) | Operating Pressure |
| SIZE | SDR | O.D. | T | I.D. | Bolt Count | Bolt Hole Size (H) | Bolt Hole Circle (BC) | R |
| ½” | 7 | 3.500 | 0.500 | 0.900 | 4 | 0.625 | 2.380 | 0.130 | 1.0 | 267 |
| ¾” | 7 | 3.880 | 0.500 | 1.110 | 4 | 0.625 | 2.750 | 0.130 | 1.0 | 267 |
| 1” | 7 | 4.250 | 0.560 | 1.380 | 4 | 0.625 | 3.130 | 0.130 | 1.0 | 267 |
| 1 ¼” | 7 | 4.630 | 0.630 | 1.720 | 4 | 0.625 | 3.500 | 0.190 | 2.0 | 267 |
| 1 ½” | 7 | 5.000 | 0.690 | 1.970 | 4 | 0.625 | 3.880 | 0.250 | 2.0 | 267 |
| 2” | 7 | 6.000 | 0.750 | 2.460 | 4 | 0.750 | 4.750 | 0.310 | 3.0 | 267 |
| 2” | 11 | 6.000 | 0.500 | 2.630 | 4 | 0.750 | 4.750 | 0.200 | 1.5 | 160 |
| 2 ½” | 7 | 7.000 | 0.880 | 2.970 | 4 | 0.750 | 5.500 | 0.310 | 4.0 | 267 |
| 3” | 7 | 7.500 | 0.940 | 3.600 | 4 | 0.750 | 6.000 | 0.400 | 4.0 | 267 |
| 3” | 11 | 7.500 | 0.530 | 3.750 | 4 | 0.750 | 6.000 | 0.280 | 2.5 | 160 |
| 4” | 7 | 9.000 | 0.940 | 4.600 | 8 | 0.750 | 7.500 | 0.400 | 5.5 | 267 |
| 4” | 11 | 9.000 | 0.550 | 4.750 | 8 | 0.750 | 7.500 | 0.280 | 3.5 | 160 |
| 5” | 7 | 10.000 | 0.940 | 5.690 | 8 | 0.875 | 8.500 | 0.440 | 6.0 | 267 |
| 6” | 7 | 11.000 | 1.000 | 6.750 | 8 | 0.875 | 9.500 | 0.400 | 7.0 | 267 |
| 6” | 11 | 11.000 | 0.630 | 6.880 | 8 | 0.875 | 9.500 | 0.280 | 4.5 | 160 |
| 8” | 7 | 13.500 | 1.120 | 8.750 | 8 | 0.875 | 11.750 | 0.400 | 11.0 | 267 |
| 8” | 11 | 13.500 | 0.850 | 8.880 | 8 | 0.875 | 11.750 | 0.280 | 8.0 | 160 |
| 10” | 7 | 16.000 | 1.190 | 10.920 | 12 | 1.000 | 14.250 | 0.400 | 16.0 | 267 |
| 10” | 11 | 16.000 | 0.980 | 11.000 | 12 | 1.000 | 14.250 | 0.310 | 12.0 | 160 |
| 12” | 7 | 19.000 | 1.500 | 12.920 | 12 | 1.000 | 17.000 | 0.400 | 23.0 | 267 |
| 12” | 11 | 19.000 | 1.250 | 13.130 | 12 | 1.000 | 17.000 | 0.280 | 20.0 | 160 |
| 14” | 7 | 21.000 | 1.630 | 14.180 | 12 | 1.125 | 18.750 | 0.400 | 37.0 | 267 |
| 14” | 11 | 21.000 | 1.380 | 14.380 | 12 | 1.125 | 18.750 | 0.310 | 30.0 | 160 |
| 16” | 7 | 23.500 | 1.880 | 16.190 | 16 | 1.125 | 21.250 | 0.400 | 49.0 | 267 |
| 16” | 11 | 23.500 | 1.650 | 16.380 | 16 | 1.125 | 21.250 | 0.350 | 40.0 | 160 |
| 18” | 7 | 25.000 | 1.800 | 18.200 | 16 | 1.250 | 22.750 | 0.400 | 48.0 | 267 |
| 18” | 9 | 25.000 | 1.750 | 18.200 | 16 | 1.250 | 22.750 | 0.400 | 48.0 | 200 |
| 18” | 11 | 25.000 | 1.670 | 18.375 | 16 | 1.250 | 22.750 | 0.350 | 45.0 | 160 |
| 20” | 7 | 27.500 | 2.125 | 20.375 | 20 | 1.250 | 25.000 | 0.310 | 66.5 | 267 |
| 20” | 9 | 27.500 | 2.060 | 20.375 | 20 | 1.250 | 25.000 | 0.310 | 61.0 | 200 |
| 20” | 11 | 27.500 | 1.810 | 20.375 | 20 | 1.250 | 25.000 | 0.400 | 55.0 | 160 |
| 22” | 7 | 29.500 | 2.300 | 22.375 | 20 | 1.375 | 27.250 | 0.310 | 83.0 | 267 |
| 22” | 9 | 29.500 | 2.130 | 22.375 | 20 | 1.375 | 27.250 | 0.310 | 72.0 | 200 |
| 22” | 11 | 29.500 | 2.000 | 22.375 | 20 | 1.375 | 27.250 | 0.370 | 65.0 | 160 |