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 THREAD DETAILS
Thread Details: 1/2 - 20 UNF (0.5" dia. 20 tpi)
Fastener Diameter = 0.500 inches
Thread Pitch = 0.050 inches
Fastener Shank Diameter = 0.500 inches
Basic Thread Pitch Diameter = 0.468 inches
Basic Thread Root Diameter = 0.435 inches
ADDITIONAL THREAD/FASTENER DETAILS
Fastener Clearance Hole Diameter = 0.53 inches
Fastener Inner Bearing Diameter = 0.53 inches
Diameter related to the Thread Stress Area = 0.451 inches
Thread Stress Area = 0.160 inches2
Thread Root Area = 0.149 inches2
Fastener Shank Cross Sectional Area = 0.196 inches2
Friction Diameter of Bolt Head/Nut = 0.628 inches
Bearing Area under Nut/Bolt Head = 0.191 inches2
Fastener Head Outer Bearing Diameter = 0.725 inches
FASTENER PROPERTY DETAILS
Standard for Fastener Material:
SAE J429 - Mechanical and Material Requirements for Externally Threaded Fasteners
Property Class or Fastener Grade = SAE Grade 5
Fastener Yield Strength = 81000.00 Lbf/in2
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 = 68.769 Lbf-ft
Torque needed to extend the fastener = 7.013 Lbf-ft
Torque needed to overcome thread friction = 28.545 Lbf-ft
Torque needed to overcome nutface friction = 33.211 Lbf-ft
Prevailing Torque Value Specified = 0.000 Lbf-ft
Fastener Preload = 10575.09 Lbf
Direct Force that would Yield the Fastener = 12956.23 Lbf
STRESSES INDUCED INTO THE FASTENER
Percentage of the yield strength utilised = 90.00 %
Von-Mises Equivalent Stress = 72900.00 Lbf/in2
Tensile Stress due to Preload = 66113.53 Lbf/in2
Surface Pressure under the Fastener Face = 55307.19 Lbf/in2
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
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