This Aluminum Extrusion Die Bearing Length Calculator helps you estimate the minimum bearing length required for a given profile based on its pressure diameter and section thickness. The bearing length is one of the key parameters in extrusion die design used to balance metal flow, improve dimensional accuracy, and extend die life.
Enter the pressure diameter (sometimes called circumscribing circle diameter) of the profile. This is the diameter of the smallest circle that can fully enclose the profile section. The unit is typically in millimeters (mm).
Input the minimum relevant wall thickness of the profile section for which you want to estimate the bearing length, also in millimeters (mm). Use the most critical/thinnest load-carrying wall that governs flow.
This calculator is based on a reference table and bilinear interpolation between thickness and pressure diameter values. It provides an engineering estimate of the minimum bearing length. Final die design should also consider alloy, press capability, profile complexity, local flow restrictions, and your own experience or in-house standards. Always review results and adjust for specific die and process conditions.