Bend Allowance

Written by Jerry Ratzlaff on . Posted in Structural Engineering

bend allowance 2bend allowance angle 1Bend allowance, abbreviated as BA, is the length of the arc through the bend area at the neutral axis.


Bend Allowance formula

\(\large{ BA = \frac{\theta \; \pi}{180} \; \left( r \;+\; K \; t \right)  }\)   


 Units English Metric
\(\large{ BA }\) = bend allowance \(\large{in}\) \(\large{mm}\)
\(\large{ \theta }\) (Greek symbol theta) = bend angle \(\large{deg}\) \(\large{rad}\)
\(\large{ r }\) = inside radius \(\large{in}\) \(\large{mm}\)
\(\large{ K }\) = K-factor \(\large{dimensionless}\)
\(\large{ t }\) = material thickness \(\large{in}\) \(\large{mm}\)


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