Trapezoidal ISO M20 Threads
grabcad
I'm developing a model dependent on threads, thus I had to study them first. I discovered relevant resources at http://mdmetric.com/tech/thddat16.htm and http://www.demec.ufmg.br/Grupos/labprojmec/Rosca_de_Movimentacao_Trapezoidal_ISO.htm, which discuss a trapezoidal M20 ISO thread.
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