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Grease Fitting Symbols
Symbol |
Meaning
|
N.P.T.
|
American
Standard Taper Pipe Thread.
|
N.P.T.F.
|
Dryseal
American Standard Taper Pipe Thread.
|
P.T.F.
|
Same
as N.P.T.F. except full thread length has been shortened by one
thread on small end of thread-also designated as P.T.F-SAE Short.
|
P.T.F
Special Short
|
Same
as N.P.T.F Short except one full thread has been shortened from
large end of thread.
|
P.T.F
Special Extra Short
|
Same
as P.T.F Short except two full threads have been shortened from
large end of thread.
|
N.P.S.F.
|
Dryseal
American Fuel Internal Straight Pipe Thread.
|
N.P.S.I.
|
Dryseal
American Intermediate Internal Straight Pipe Thread.
|
N.P.S.M.
|
American
Standard Straight Mechanical Pipe Thread.
|
1/4"-28
Taper Thread (SAE-LT)
|
Thread
has a 3/4" taper per foot and a pitch diameter of .2257 / .2224
at small end. The mating tapped hole is 1/4"-28U.N.F. 3B straight
thread. Tap drill must not exceed .215" diameter.
|
1/4"-28
Special
Taper Drive Thread |
Thread
Forming-Forms thread in mating part during installation-when removed
can be replaced by standard 1/4"-28 taper thread (SAE-LT) fitting.
|
1/8"
Pipe Special
Taper Drive Thread |
Thread
Forming-Forms thread in mating part during installation-when removed
can be replaced by standard 1/8"-27 P.T.F series fitting.
|
Symbol
|
Designation
|
Symbol
|
Designation
|
N
|
American Standard |
S
|
Straight
|
P
|
Pipe |
M
|
Mechanical
|
T
|
Taper |
I
|
Intermediate
|
F
|
Fuel |
LT
|
Lubrication
Thread
|