3/4" npt (national pipe thread) is a United States
Standard, Taper Fit Thread.
Pipe Outside Diameter is 1.050" x 14 threads per inch
|
(excerpt from ANSI B1.20.1 Thread
Specifications) |
Nominal
Size
(in.) |
Wrench
Makeup
Length for
Internal
Thread
L3 (in.) |
Total
Length:
End of Pipe
to Vanish
Point
L4 (in.) |
Pitch
Diameter at
Beginning
of External
Thread
E0 (in.) |
Pitch
Diameter at
Beginning
of Internal
Thread
E1 (in.) |
Height of
Thread
(Max.)
H (in.) |
| 3/4" |
.2143" |
.7935" |
.96768" |
.98887" |
.05714" |
|
American Standard Taper Pipe Thread, NPT |
Nominal
Size
(in.) |
Outside
Diameter
D
in. |
Number
of Threads
Per Inch
n |
Pitch of
Thread
P
in. |
Normal
Engagement
By Hand
L1
in. |
Length of
Effective
Thread
L2
in. |
| 3/4" |
1.050" |
14 |
.07143" |
.339" |
.5457" |
