Per our bending guidelines, please enter bend angle definitions as measured from the outside of the bend. In the illustration below, the acute bend is called out as 130°.

Think of it as the number of degrees the flange bends from a flat position.
How to configure bend angle definitions before placing an order
When you enter bend definitions before placing an order on our website, you should be able to see a 3D preview of your bent part to confirm the definitions are correct.

Note: the bend radius and K factor for your desired material thickness can be found on the material page or the bending calculator. We do not offer custom bend radii.
Where to find minimum and maximum bend angle limits
You can confirm the minimum and maximum bend angle for each material thickness on the individual material pages in our Material Catalog. Learn more about how to confirm material specifications and properties.
In our thinner sheet metal materials, we can bend flanges between 5 and 130 degrees. Our thickest sheet metals can only bend as far as 90 degrees.
Polycarbonate is limited to a 45-90 degree bend angle definition range. Learn more about polycarbonate bending considerations.