Cracking around the insert
Review the hole and wall dimensions, plastic specification, insertion alignment and actual process settings. For heat-based routes, include the thermal history. Avoid assuming the insert alone is the cause.
The insert rotates
Check that the specified insert and receiving hole were used, the retention features engaged as intended, and the installation was completed correctly. Compare the tightening conditions with the agreed joint requirements.
Poor seating or tilted installation
Record tool alignment, part support, installation direction, depth control and access. Inspect the receiving geometry and any interference with nearby features.
Blocked or damaged threads
Look for plastic entry, contamination, tool contact, fastener mismatch and coating or burr issues. Record the thread specification and the inspection method used.
Prepare a useful problem report
Send photos of installed and failed parts, known-good and failed samples when available, drawing revisions, material details, process settings and when the issue occurs. Preserve the original condition of samples needed for investigation.