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Unit:inch

Pipe threads where pressure-tight joints are not made on the threads

ISO 228-1 - 2000

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国际ISO 228-1 - 2000 ISO228-1 228-1ISO Pipe threads where pressure-tight joints are not made on the threads
Thread Size
1/16 1/8 1/4 3/8 1/2 5/8 3/4 7/8 1 1-1/8 1-1/4 1-1/2
PP Number of threads in 25.4mm
P Thread Pitch
h Height of thread
d major diameter d=D
d2 pitch diameter d2=D2
d1 minor diameter d1=D1
T Internal thread D2 lower deviation
upper deviation
External thread d2 lower deviation, Class A
lower deviation, Class B
upper deviation
Internal thread D1 lower deviation
upper deviation
External thread d lower deviation
upper deviation
28 28 19 19 14 14 14 14 11 11 11 11
0.907 0.907 1.337 1.337 1.814 1.814 1.814 1.814 2.309 2.309 2.309 2.309
0.581 0.581 0.856 0.856 1.162 1.162 1.162 1.162 1.479 1.479 1.479 1.479
7.723 9.728 13.157 16.662 20.955 22.911 26.441 30.201 33.249 37.897 41.910 47.803
7.142 9.147 12.301 15.806 19.793 21.749 25.279 29.039 31.770 36.418 40.431 46.324
6.561 8.566 11.445 14.950 18.631 20.587 24.117 27.877 30.291 34.939 38.952 44.845
0 0 0 0 0 0 0 0 0 0 0 0
+0.107 +0.107 +0.125 +0.125 +0.142 +0.142 +0.142 +0.142 +0.180 +0.180 +0.180 +0.180
-0.107 -0.107 -0.125 -0.125 -0.142 -0.142 -0.142 -0.142 -0.180 -0.180 -0.180 -0.180
-0.214 -0.214 -0.250 -0.250 -0.284 -0.284 -0.284 -0.284 -0.360 -0.360 -0.360 -0.360
0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0
+0.282 +0.282 +0.445 +0.445 +0.541 +0.541 +0.541 +0.541 +0.640 +0.640 +0.640 +0.640
-0.214 -0.214 -0.250 -0.250 -0.284 -0.284 -0.284 -0.284 -0.360 -0.360 -0.360 -0.360
0 0 0 0 0 0 0 0 0 0 0 0
Thread Size
1-3/4 2 2-1/4 2-1/2 2-3/4 3 3-1/2 4 4-1/2 5 5-1/2 6
PP Number of threads in 25.4mm
P Thread Pitch
h Height of thread
d major diameter d=D
d2 pitch diameter d2=D2
d1 minor diameter d1=D1
T Internal thread D2 lower deviation
upper deviation
External thread d2 lower deviation, Class A
lower deviation, Class B
upper deviation
Internal thread D1 lower deviation
upper deviation
External thread d lower deviation
upper deviation
11 11 11 11 11 11 11 11 11 11 11 11
2.309 2.309 2.309 2.309 2.309 2.309 2.309 2.309 2.309 2.309 2.309 2.309
1.479 1.479 1.479 1.479 1.479 1.479 1.479 1.479 1.479 1.479 1.479 1.479
53.746 59.614 65.710 75.184 81.534 87.884 100.330 113.030 125.730 138.430 151.130 163.830
52.267 58.135 64.231 73.705 80.055 86.405 98.851 111.551 124.251 136.951 149.651 162.351
50.788 56.656 62.752 72.226 78.576 84.926 97.372 110.072 122.772 135.472 148.172 160.872
0 0 0 0 0 0 0 0 0 0 0 0
+0.180 +0.180 +0.217 +0.217 +0.217 +0.217 +0.217 +0.217 +0.217 +0.217 +0.217 +0.217
-0.180 -0.180 -0.217 -0.217 -0.217 -0.217 -0.217 -0.217 -0.217 -0.217 -0.217 -0.217
-0.360 -0.360 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434
0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0
+0.640 +0.640 +0.640 +0.640 +0.640 +0.640 +0.640 +0.640 +0.640 +0.640 +0.640 +0.640
-0.360 -0.360 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434 -0.434
0 0 0 0 0 0 0 0 0 0 0 0
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