What is K-factor and bend radius?

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K-factor is a ratio that represents the location of the neutral axis in relation to the material thickness in sheet metal bending. Bend radius is the inside radius of a bend.

K-factor is used to calculate the bend allowance, which is the amount of material that will be stretched during bending.
A lower K-factor indicates that the neutral axis is closer to the inside surface of the bend, while a higher K-factor means it is closer to the outside surface.
Bend radius is important in determining the minimum achievable inside bend radius without causing material deformation or cracking.
For example, a K-factor of 0.33 means the neutral axis is located at 33% of the material thickness from the inside surface of the bend.
A smaller bend radius will result in a tighter bend, while a larger bend radius will result in a more gradual bend.

What is K-factor and bend radius?

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