Example Calculation - Metric Units
Presented below are the results from TORQUE for a M12 Grade 8.8 bolt. (These calculations are in metric units, the TORQUE program can also work in units of inches and pounds and work with the unified thread form.)
TORQUE TIGHTENING ANALYSIS RESULTS Example calculation for a M12 bolt. FASTENER THREAD DETAILS Thread Details: M12 x 1.75 Coarse Thread Fastener Diameter = 12.000 mm Thread Pitch = 1.750 mm Fastener Shank Diameter = 12.000 mm Basic Thread Pitch Diameter = 10.863 mm Basic Thread Root Diameter = 9.853 mm ADDITIONAL THREAD/FASTENER DETAILS Fastener Clearance Hole Diameter = 13.00 mm Fastener Inner Bearing Diameter = 13.00 mm Diameter related to the Thread Stress Area = 10.358 mm Thread Stress Area = 84.267 mm2 Thread Root Area = 76.247 mm2 Fastener Shank Cross Sectional Area = 113.097 mm2 Friction Diameter of Bolt Head/Nut = 14.800 mm Bearing Area under Nut/Bolt Head = 83.692 mm2 Fastener Head Outer Bearing Diameter = 16.600 mm FASTENER PROPERTY DETAILS Standard for Fastener Material: ISO 898-1 Mechanical properties of fasteners made of carbon steel and alloy steel. Property Class or Fastener Grade = 8.8 Fastener Yield Strength = 640.00 N/mm2 JOINT ASSEMBLY DETAILS Thread Frictional Conditions: Zinc Flake Coating Thread Friction Value = 0.120 Underhead Frictional Conditions: Zinc Flake Coating Nut/Bolt Head Friction Value = 0.120 FASTENER TIGHTENING ANALYSIS Yield Point Tightening Factor specified = 0.90 Total Tightening Torque = 82.737 Nm Torque needed to extend the fastener = 12.007 Nm Torque needed to overcome thread friction = 32.447 Nm Torque needed to overcome nutface friction = 38.283 Nm Prevailing Torque Value Specified = 0.000 Nm Fastener Preload = 43111.24 N Direct Force that would Yield the Fastener = 53930.57 N STRESSES INDUCED INTO THE FASTENER Percentage of the yield strength utilised = 90.00 % Von-Mises Equivalent Stress = 576.00 N/mm2 Tensile Stress due to Preload = 511.61 N/mm2 Surface Pressure under the Fastener Face = 515.12 N/mm2
Presented below is further information related to this program
Web
pages giving further details about TORQUE
Example
calculations (Inch/Lb) completed by TORQUE
Torque
Datasheet in Adobe pdf format
The download for our demo program is packaged in a self extracting exe file that includes an uninstall facility if/when you want to cleanly remove the program and associated files from your system. To install the program when you have downloaded the file you need just to run it by double clicking on the file from Explorer or by using the Run option from the Start menu.
