Inserts are classified as two general types: those held in place by external threads and those that use some means other than threads (knurls, grooves, interference fit) for their holding power.

ALLIED MACHINE AND ENGINEERING, a manufacturer of holemaking and finishing cutting tools, launched the T-A Pro M geometry insert for stainless steel and heat-resistant super alloy (HRSA) materials.

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 ...