/3/ - 3DCG

>>522542
You do, but you're not supposed to. Threads in engineering are usually only defined in cad and almost exclusively done in a post process. The only exception being 3d printing and molding(nobody molds threads to any kind of material, though, cause it's retarded). The reason being the threading process is not only easier, it's more accurate than what any mold/print can provide. I guess in english the word is tap, pic related. Anyway, back to the topic, if you want one, you need to model it, most likely with a helix and a profile or something, ask google.
A fast check reveals that they added a fast thread function of sorts.
http://help.solidworks.com/2016/English/WhatsNew/c_thread_wizard.htm
So I guess, you don't need to model them by hand anymore.