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STRETCHER CAPACITY -- The correct capacity for stretchers in aluminum extrusion lines is usually based on the alloy, yield strength at the current temper, and cross-section area of the section.
Convenient tables for determining stretcher capacity in tons are available in both Metric and English units and may be downloaded here:

click here to download stretcher capacity tables

PRESS SPECIFIC PRESSURE CALCULATIONS -- Sometimes referred to as die face pressure, press specific pressure is calculated by dividing press tonnage by the area of the container opening.  Many press experts use this parameter to determine the correct size relationship between press tons and billet diameter.  Tables of press specific pressure, in both English and Metric units, may be downloaded here:

click here to download specific pressure tables