|
Denotation |
Definition |
|
PTF |
Also
known
as
PTF
–
SAE
Short,
American
Standard
Taper
Thread |
|
NPTF |
American
Standard
Taper
Pipe
Thread
for
Dryseal
Pressure |
|
NPT |
Same
as
PTF
except
full
thread
length
is
lengthened
by
one
thread
on
the
small
end |
|
PTF
Special
Short |
One
full
thread
has
been
shortened
from
the
large
end
of
the
thread |
|
PTF
Special
Extra
Short |
Two
full
threads
have
been
shortened
from
the
large
end
of
the
thread |
|
NPSM |
American
National
Standard
Straight
Pipe
Thread
for
mechanical
joints |
|
NPSI |
American
National
Dryseal
Intermediate
Internal
Straight
Pipe
Thread |
|
NPSF |
American
National
Dryseal
Fuel
Internal
Straight
Pipe
Thread |
