TORQUE Program

Example Calculation - Metric Units

Presented below are the results from TORQUE for a M12 Grade 8.8 bolt with a nylon patch type locking device that creates a prevailing torque. (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.
 
Torque tightening analysis for a M12 bolt.
 
FASTENER DETAILS
Fastener Diameter                          = 12.00 mm
Fastener Shank Diameter                    = 12.00 mm
Thread Pitch                               = 1.75 mm
Included angle between the thread flanks   = 60.00 degrees
Thread Pitch Diameter                      = 10.863 mm
Thread Root Diameter                       = 9.853 mm
Diameter related to the Thread Stress Area = 10.358 mm
Thread Stress Area                         = 84.264 mm˛
Thread Root Area                           = 76.248 mm˛
Bearing Area under Nut/Bolt Head           = 99.620 mm˛
Fastener Outer Bearing Diameter            = 17.20 mm
Fastener Inner Bearing Diameter            = 13.00 mm
Fastener Clearance Hole Diameter           = 13.00 mm
Effective friction diameter of nut/bolt    = 15.20 mm
Fastener Yield Strength                    = 640.00 N/mm˛
 
JOINT ASSEMBLY DETAILS
Black oxide steel external thread, no finish on steel
internal thread, no lubricant. Black oxide steel nut
or bolt, no oil, machined steel bearing surface. Prevailing
torque caused by a nylon/polyester patch on the threads.
Thread Friction Value                      = 0.120
Nut/Bolt Head Friction Value               = 0.120
 
TORQUE TIGHTENING ANALYSIS RESULTS
Yield Point Tightening Factor specified    = 0.90
Total Tightening Torque                    = 83.64 Nm
This torque is composed from:
Torque needed to extend the fastener       = 8.98 Nm
Torque needed to overcome thread friction  = 24.26 Nm
Torque needed to overcome nutface friction = 29.40 Nm
Prevailing Torque Value                    = 21.00 Nm
 
FORCE ANALYSIS RESULTS
Fastener Preload                           = 32239.37 N
Direct Force that would Yield the Fastener = 53928.91 N
Preload as a percentage of Yield Force     = 59.78 %
 
MAXIMUM STRESSES INDUCED INTO THE FASTENER
Percentage of the yield strength utilised  = 90.00 %
Von-Mises Equivalent Stress                = 576.00 N/mm˛
Tensile Stress due to Preload              = 382.60 N/mm˛
Torsional Stress due to the applied torque = 248.59 N/mm˛
Surface Pressure under the Nut Face        = 323.62 N/mm˛


Torque pdf Datasheet 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.

TORQUE Demo Program

Pricing and ordering details for the program