The convenient tool for fundamental calculation of bolted joints on your mobile device.


- more than 50 thread sizes (M3 - M64 coarse and fine, MJ, UNC, UNF, UNJF)

- different material strength grades for steel and aluminum screws

- clamped components made of steel, aluminum, magnesium, plastics

- proposal for tightening torque with possibility of own specification

- consideration of axial and transverse loading

- consideration of preload relaxation


- calculation of important safety margins (assembly, static operating, contact pressure, sliding under transverse loading)

- dynamic tightening diagram and joint diagram

- comprehensive help

- user language English


Now available free
of charge for
Smartphone und Tablet
Google Play   Apple®
iPhone und iPad
Apple App Store