Bending Radii
Minimum Bend Radius as a Function of Diameter and Standard Dimension Ratio.
(All measurements are in Inches)
| Size | OD | SDR 9 | SDR 11 | SDR 13.5 | |||
| Wall | Min. Radius | Wall | Min. Rad. | Wall | Min. Rad. | ||
| 1" | 1.315 | .146 | 15.4 | .120 | 20.1 | .097 | 25.9 |
| 1 1/4" | 1.660 | .184 | 17.1 | .151 | 22.3 | .123 | 28.9 |
| 1 1/2" | 1.900 | .211 | 18.2 | .173 | 23.8 | .141 | 30.8 |
| 2" | 2.375 | .264 | 20.0 | .216 | 26.3 | .176 | 34.2 |
| 2 1/2" | 2.875 | .319 | 21.8 | .261 | 28.0 | .213 | 37.3 |
| 3" | 3.500 | .389 | 23.8 | .318 | 31.4 | .259 | 40.9 |
| 4" | 4.500 | .500 | 26.4 | .409 | 35.0 | .333 | 45.8 |
| 6" | 6.625 | .736 | 30.9 | .602 | 41.3 | .491 | 54.4 |
| Size | OD | SDR 15.5 | SDR 17 | ||
| Wall | Min. Radius | Wall | Min. Rad. | ||
| 1" | 1.315 | .085 | 30.6 | .077 | 34.1 |
| 1 1/4" | 1.660 | .107 | 34.2 | .098 | 38.1 |
| 1 1/2" | 1.900 | .123 | 36.4 | .112 | 40.6 |
| 2" | 2.375 | .153 | 40.5 | .140 | 45.2 |
| 2 1/2" | 2.875 | .180 | 44.3 | .169 | 49.5 |
| 3" | 3.500 | .226 | 48.5 | .206 | 54.2 |
| 4" | 4.500 | .290 | 54.5 | .265 | 61.0 |
| 6" | 6.625 | .427 | 64.9 | .390 | 72.8 |
Bending Information
Conduit is often routed around corners during placement and pulling tension must be increased to complete the pull. It is important to determine the minimum radius to which the conduit can be bent without mechanically degrading the performance of the conduit. See Table above.
