Table
Offset Shrink Constants by Angle
Offset Shrink Constants by Angle reference with assumptions and boundary notes.
Reference boundary
Geometry reference only. Actual field layout depends on bender markings, raceway type, and installer tolerance.
Reference table
Estimate conduit shrink per unit of offset for common offset bend angles.
| Bend angle | Shrink per unit offset | Field approximation | Use |
|---|---|---|---|
| 10 | 0.087 | about 1/16 per unit offset | Shrink = offset depth x shrink constant |
| 22.5 | 0.199 | about 3/16 per unit offset | Shrink = offset depth x shrink constant |
| 30 | 0.268 | about 1/4 per unit offset | Shrink = offset depth x shrink constant |
| 45 | 0.414 | about 3/8 per unit offset | Shrink = offset depth x shrink constant |
| 60 | 0.577 | about 1/2 per unit offset | Shrink = offset depth x shrink constant |
Use notes
- Use this table for preliminary reference and arithmetic checks only.
- Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.