Products - Thread Repair Index - Powercoil gauges

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STI Gauges are available in both 4H5H or 6H class of fit for metric threads, 3B for unified Threads and close or medium for WHITWORTH threads.

Powercoil gauges are supplied for two different classes of fit (tolerance). These are close and medium tolerance.

Class of fit of the finished assembly is dependent on the accuracy of the tapped hole.

If the tapped hole gauges correctly it is not necessary to gauge the installed insert.

After the Powercoil is installed, the Go Gauge occasionally does not enter freely.

However the insert will always seat itself when the bolt or screw is installed and tightened.

Where precision is required, 3B gauges should be used. When using Locking Inserts, 3B gauges should be used as close precision is required.

THREAD TOLERANCE CLOSE MEDIUM
METRIC 4H5H 5H
UN 3B 2B
IMPERIAL CLOSE MEDIUM