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

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TORQUE Demo Program

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