Classification of American pipe thread taps

DesignationSymbolClassMaterialThreads to be cutRange
Straight Pipe Thread Tap1 / 8
Dryseal Straight Pipe Thread Tap1 / 8 3 / 4
Taper Pipe Thread Tap1 / 16
Dryseal Taper Pipe Thread Tap1 / 16

■Thread limit of American Pipe Thread Taps

Straight pipe thread taps for (NPS) G Class

Unit : mm

SizeMajor diameterPitch diameterMinor diameter�
Max.Min. ToleranceMax.Min.ToleranceMax.
r pipe threa dimensions change d Number od taps (NPT) G epending on actually f threadsClass measured. Tc (Max) Tc (Min) Axis o Fc(Max) Fc (Min) Tr(Max) Tr (Min) Taperf tap Fr(Max) Fr(Min)