 Create the thread model
(click here to build)
Click on  and Project
Open EngineeringNut and BoltNut Bottom
Draw the nut bottom
 Draw  a circle and a hexagon for the bottom of the nut in lines 
as illustrated...
Draw triangles
Draw triangles 
for the bottom of the nut as illustrated...
Press Save to save the model
(click here to go back)
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