ISO Screws Basic Calculator app for iPhone and iPad

This App is not a professional Software, but provide you a Basic Calculation for the ISO screw connections. Starting from the dimensions of the screws and the mechanical & physical properties of the connection, this App calculates simultaneously all the most important parameters usually considered for the stability of the Screw connection. A green light tells you if the value of the parameter is enough to ensure a minimum Safety Factor of 1.1, otherwise the value becomes red. As said the Software is not professional, therefore use this App just for a fast and preliminary check.

Inputs:
Material Ultimate Stress [σu]
Material Yield Stress [σy]
Material Maximum Compression Stress [σc]
Material Youngs Modulus [E]
Bolt Head – Plate Friction Coefficient
Bolt Thread – Plate Friction Coefficient
Screw’s Nominal & Head Diameters
Screw’s Length & Hole Depth
External Axial Load and Torque

Outputs:
Axial Force on the Screw
Compression Force On Plates
Maximum Possible Transverse Load
Total Stress On Screw
Stress on Thread
Screw Head Contact Pressure