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The taper
of thread is 1 in 16 or 0.75 in, per ft. measured on the diameter
and along the axis.
The crest
and root of pipe threads are truncated a minimum of 0.033 p.
Taper Threads
H = 0.866025
p
h
= 0.800000 p
(Unit
: Inch)
Nominal
Pipe
Size
(inch) |
Outside
Diameter of Pipe |
Threads
Per
Inch |
Pitch
of Threads |
Hand-tight
Engagement
|
Effective
Thread Length External |
Depth
of Thread |
| D |
n |
P |
L1 |
E1 |
L2 |
h |
| 1/8 |
0.405 |
27 |
0.03704 |
0.1615 |
0.37360 |
0.2639 |
0.02963 |
| 1/4 |
0.540 |
18 |
0.05556 |
0.2278 |
0.49163 |
0.4018 |
0.04444 |
| 3/8 |
0.675 |
18 |
0.05556 |
0.240 |
0.62701 |
0.4078 |
0.04444 |
| 1/2 |
0.840 |
14 |
0.07143 |
0.320 |
0.77843 |
0.5337 |
0.05714 |
| 3/4 |
1.050 |
14 |
0.07143 |
0.339 |
0.98887 |
0.5457 |
0.05714 |
|
1 |
1.315 |
11½ |
0.08696 |
0.400 |
1.23863 |
0.6828 |
0.06957 |
| 1¼ |
1.660 |
11½ |
0.08696 |
0.420 |
1.58338 |
0.7068 |
0.06957 |
| 1½ |
1.900 |
11½ |
0.08696 |
0.420 |
1.82234 |
0.7235 |
0.06957 |
|
2 |
2.375 |
11½ |
0.08696 |
0.436 |
2.29627 |
0.7565 |
0.06957 |
| 2½ |
2.875 |
8 |
0.12500 |
0.682 |
2.76216 |
1.1375 |
0.10000 |
|
3 |
3.500 |
8 |
0.12500 |
0.766 |
3.38850 |
1.2000 |
0.10000 |
| 3½ |
4.000 |
8 |
0.12500 |
0.821 |
3.88881 |
1.2500 |
0.10000 |
|
4 |
4.500 |
8 |
0.12500 |
0.844 |
4.38712 |
1.3000 |
0.10000 |
|
5 |
5.563 |
8 |
0.12500 |
0.937 |
5.44929 |
1.4063 |
0.10000 |
|
6 |
6.625 |
8 |
0.12500 |
0.958 |
6.50597 |
1.5125 |
0.10000 |
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