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Geekly

Member Since: June 30, 2016

Country: United States

  • They also make thread-forming screws for plastic. I would definitely use those instead of machine threads. There are design guides to tell you what diameter pilot hole to use, but it's typically about 80% of the major diameter of the fastener. I would recommend running a drill in the hole ahead of time to clean it out. With the thread forming screws you can get away with more thread engagement without worrying about cracking bosses.

    https://www.mcmaster.com/#thread-forming-screws/=1cniabq

    http://www.stanleyind.com/Downloads/DELTA_PT_Brochure.pdf

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