 Create the thread model
(click here to build)
Click on  and Project
Open EngineeringNut and BoltBolt Top
Draw thread end
 Draw  a new point  and line 
for the top end of the thread as illustrated...
Draw the bolt
Draw the top of the bolt in lines as illustrated...
Draw triangles
Draw triangles 
for the bolt as illustrated...
Press Save to save the model
(click here to go back)
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