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Logic
for each word used in Designation
N – National (American) Standard
P – Pipe
T – Taper
S – Straight
C – Coupling
M – Mechanical
L – Locknut
H – House Coupling
R – Railing Fittings
F – Fuel & Oil
I – Intermediate
NPT,
NPTF, PTF, NPTR are taper threads (Taper 1:16) others are
parallel threads.
These
gauges are of two types.
Basic type - In basic type gauges, one step is provided
which corresponds to basic size of component.
Limit type – In this case three steps are provided
on the gauge. These steps corresponds to minimum, basic and
maximum size of components.
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