This article was updated May 25, 2023. It was originally published Nov. 17, 2009. To put hard, durable threaded holes in plastics, engineers often specify threaded metal inserts that will securely ...

They include tapered, straight hole, and symmetrical inserts, as well as threaded studs. The inserts start at 0 to 80 for inch threads and M1.6 for metric. The tapered H Series is said to outperform ...