OSI Plastics Telecom

Bending Radii


Minimum Bend Radius as a Function of Diameter and Standard Dimension Ratio.

(All measurements are in Inches)

SizeODSDR 9SDR 11SDR 13.5SDR 15.5SDR 17
WallMin. RadiusWallMin. RadiusWallMin. RadiusWallMin. RadiusWallMin. Radius
1"1.315 .146 15.4.120 20.1.097 25.9.085 30.6.077 34.1
1 1/4"1.660 .184 17.1.151 22.3.123 28.9.107 34.2.098 38.1
1 1/2"1.900 .211 18.2.173 23.8.141 30.8.123 36.4.112 40.6
2"2.375 .264 20.0.216 26.3.176 34.2.153 40.5.140 45.2
2 1/2"2.875 .319 21.8.261 28.0.213 37.3.180 44.3.169 49.5
3"3.500 .389 23.8.318 31.4.259 40.9.226 48.5.206 54.2
4"4.500 .500 26.4.409 35.0.333 45.8.290 54.5.265 61.0
6"6.625 .736 30.9.60241.3.49154.4.42764.9.39072.8

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.