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Date Published:Jun. 18. 2015

Parallel Pipe Threads

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Parallel Pipe Threads

Basic profile, formula and basic dimensions of parallel pipe threads

en_12_technical-12-parallel-pipe-threads
12_technical-12-parallel-pipe-threads-2
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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