he allowable steel strengths for Chem-Bolt are calculated as follows using the stresses from the previous table. One method used to calculate the value is the American Institute of Steel Construction (AISC) Manual of Steel Construction, Allowable Stress Design. Using this method, the allowable tensile stress, Ft, and the allowable shear stress, Fv, are calculated as follows: Ft = 0.33 x Fu Fv = 0. 17 x Fu Where Fu = minimum specified ultimate tensile strength for the steel material.