TORQUE Program

Example Calculation - Inch/Lb Units

Presented below are the results from TORQUE for a 1/2" UNF bolt with a nylon thread patch that creates a prevailing torque. (These calculations are in lb/inch units, the TORQUE program can also work in metric units.)

TORQUE TIGHTENING ANALYSIS RESULTS
 
Analysis of a 1/2 inch UNF bolt
 
FASTENER DETAILS
Fastener Diameter                          = 0.500 inches
Fastener Shank Diameter                    = 0.500 inches
Thread Pitch                               = 0.050 inches
Included angle between the thread flanks   = 60.000 degrees
Thread Pitch Diameter                      = 0.468 inches
Thread Root Diameter                       = 0.439 inches
Diameter related to the Thread Stress Area = 0.454 inches
Thread Stress Area                         = 0.162 inches²
Thread Root Area                           = 0.151 inches²
Bearing Area under Nut/Bolt Head           = 0.198 inches²
Fastener Outer Bearing Diameter            = 0.720 inches
Fastener Inner Bearing Diameter            = 0.516 inches
Fastener Clearance Hole Diameter           = 0.516 inches
Effective friction diameter of nut/bolt    = 0.624 inches
Fastener Yield Strength                    = 92000.00 Lb/in²
 
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                    = 80.21 Lb-ft
This torque is composed from:
Torque needed to extend the fastener       = 6.50 Lb-ft
Torque needed to overcome thread friction  = 26.47 Lb-ft
Torque needed to overcome nutface friction = 30.55 Lb-ft
Prevailing Torque Value                    = 16.70 Lb-ft
 
FORCE ANALYSIS RESULTS
Fastener Preload                           = 9796.47 Lb
Direct Force that would Yield the Fastener = 14860.46 Lb
Preload as a percentage of Yield Force     = 65.92 %
 
MAXIMUM STRESSES INDUCED INTO THE FASTENER
Percentage of the yield strength utilised  = 90.00 %
Von-Mises Equivalent Stress                = 82800.00 Lb/in²
Tensile Stress due to Preload              = 60649.18 Lb/in²
Torsional Stress due to the applied torque = 32544.92 Lb/in²
Surface Pressure under the Nut Face        = 49468.75 Lb/in²

Torque pdf Datasheet Presented below is further information related to this program

Web pages giving further details about TORQUE 

Example calculations (METRIC) 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