No effect threads form normally

Threads forms unevenly

Both die and threads damaged

Pipe broken into pieces

To cut straight slot

To cut internal holes

To cut external curves

To cut internal curves

V notch

Slant notch

Square notch

Straight notch

V notch

Slant notch

Square notch

Straight notch

Comparing with radius of the radius gauge

Actual measuring with the help of radius gauge

Calculated with the help of the radius gauge

Visually displayed in radius gauge