M14 X 1.25 Metric Professional Spark Plug Thread Repair Kit 88006 Spark Plug Helical Inserts
Inserts - Qty(6) 3/8 & Qty(6) 3/4
*The precision insert system was devised as a simple method of repairing stripped or damaged threads in any metal or valuable parts. Inserts are also used in new products such as die castings or plastics, where excessive stress on threads could cause damage or failure.
Precision inserts are helical coils of diamond shaped 18.8 stainless steel wire which meets or exceeds AMS-7245 specification Inserts are sized to provide a precisely controlled interference fit in an oversized tapped hole. The tap used for this purpose is the same pitch as the original thread, but has a larger diameter. When the insert is installed, the hole is returned to its original size.
Because the insert provides an enlarged bearing area, the restored fastening is stronger than the original. It is also more durable, since the stainless steel thread is generally tougher than the original material. Precision inserts are corrosion resistant and their 22-microinch or better surface finish provides a smooth-running, wear-resistant fastening.
*Information provided by Chrislynn Precision Helical Inserts