5/16" – 18 UNC Thread Repair Inserts Helical Coil Plug Gauge

Nominal diameter: 5/16″
Thread per inch: 18
The size of the list is the nominal diameter, not the actual size.
Thread insertion only.

Please note that the product picture is for reference purposes only and may not depict the exact item and size you are purchasing.
If you have any questions, please do not hesitate to contact us at anytime.