Parallel Pipe Threads

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Parallel Pipe Threads

Basic profile, formula and basic dimensions of parallel pipe threads

Unit : mm

Nominal
Diameter of
Thread 
Number of
screw threads
(per 25.4㎜)
 n
Pitch
P
(Reference)
Height of screw
thread
h
Top of thread
and root radius
r
Male Screw
Outside diameter
d
Effective diameter
d2
Root diameter
d1
Female Screw
Root diameter
D
Effective diameter
D2
Inside diameter
D1
G 1/16  28 0.9071 0.581 0.12     7.723     7.142     6.561
G 1/8
G 1/4
G 3/8 
28
19
19
0.9071
1.3368
1.3368
0.581
0.856
0.856
0.12
0.18
0.18
    9.728
  13.157
  16.662
    9.147
  12.301
  15.806
    8.566
  11.445
  14.950
G 1/2
G 5/8
G 3/4
14
14
14
1.8143
1.8143
1.8143
1.162
1.162
1.162
0.25
0.25
0.25
  20.955
  22.911
  26.441
  19.793
  21.749
  25.279
  18.631
  20.587
  24.117
G 7/8
G1
G1 1/8 
14
11
11
1.8143
2.3091
2.3091
1.162
1.479
1.479
0.25
0.32
0.32
  30.201
  33.249
  37.897
  29.039
  31.770
  36.418
  27.877
  30.291
  34.939
G1 1/4
G1 1/2
G1 3/4 
11
11
11
2.3091
2.3091
2.3091
1.479
1.479
1.479
0.32
0.32
0.32
  41.910
  47.803
  53.746
  40.431
  46.324
  52.267
  38.952
  44.845
  50.788
G2
G2 1/4
G2 1/2 
11
11
11
2.3091
2.3091
2.3091
1.479
1.479
1.479
0.32
0.32
0.32
  59.614
  65.710
  75.184
  58.135
  64.231
  73.705
  56.656
  62.752
  72.226
G2 3/4
G3
G3 1/2
11
11
11
2.3091
2.3091
2.3091
1.479
1.479
1.479
0.32
0.32
0.32
  81.534
  87.884
100.330
  80.055
  86.405
  98.851
  78.576
  84.926
  97.372
G4
G4 1/2
G5 
11
11
11
2.3091
2.3091
2.3091
1.479
1.479
1.479
0.32
0.32
0.32
113.030
125.730
138.430
111.551
124.251
136.951
110.072
122.772
135.472
G5 1/2
G6 
11
11
2.3091
2.3091
1.479
1.479
0.32
0.32
151.130
163.830
149.651
162.351
148.172
160.872


 


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