Hi,

Do you know why the FOS of symmetrical screws"needs attention" even if it's above the desired limit (see the example in image)?

In SW help I've found this:

"If you use symmetrical bolts, for a pre-load value enter the total pre-load value of the full section bolt; for bolt mass value, enter 1/2 or 1/4 of the mass of the full section bolt according to the selected symmetry type. The computed results for a symmetric bolt, such as shear force, axial force, bending moment, and torque, equal 1/2 or 1/4 of the results computed for the full model with a full section bolt."

So I'am wondering if the FOS of the full screw has to be calculated in other ways...

Thank you for your help.

Federico 

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