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Detection Tools
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Thread Gauge
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JPG
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GPIP - G
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Nominal size
Thread per inch
Pitch (mm)
External
Internal
Major diameter
Max.
Min
Pitch diameter
Max.
Min
Minor diameter
Max.
Min
Minor diameter
Max.
Min
Pitch diameter
Max.
Min
Minor diameter
Max.
Min
Class A
Class B
G 1/16
28
0.91
7.723
0
-241
7.142
0
-107
-214
6.651
0
no rules
7.723
0
no rules
7.142
0
107
6.651
0
282
G 1/8
28
0.91
9.728
0
-241
9.147
0
-107
-214
8.566
0
9.728
0
9.147
0
107
8.566
0
282
G 1/4
19
1.34
13.157
0
-250
12.301
0
-125
-250
11.445
0
13.157
0
12.301
0
125
11.445
0
445
G 3/8
19
1.34
16.662
0
-250
15.806
0
-125
-250
14.95
0
16.662
0
15.806
0
125
14.95
0
445
G 1/2
14
1.81
20.955
0
-284
19.793
0
-142
-284
18.631
0
20.955
0
19.793
0
142
18.631
0
541
G 5/8
14
1.81
22.911
0
-284
21.749
0
-142
-284
20.587
0
22.911
0
21.749
0
142
20.587
0
541
G 3/4
14
1.81
26.441
0
-284
25.279
0
-142
-284
24.117
0
26.441
0
25.279
0
142
24.117
0
541
G 7/8
14
1.81
30.201
0
-284
29.039
0
-142
-284
27.877
0
30.201
0
29.039
0
142
27.877
0
541
G 1
11
2.31
33.249
0
-360
31.77
0
-180
-360
30.291
0
33.249
0
31.77
0
180
30.291
0
640
G 1 1/8
11
2.31
37.897
0
-360
36.418
0
-180
-360
34.939
0
37.897
0
36.418
0
180
34.939
0
640
G 1 1/4
11
2.31
41.91
0
-360
40.431
0
-180
-360
38.952
0
41.91
0
40.431
0
180
38.952
0
640
G 1 1/2
11
2.31
47.803
0
-360
46.324
0
-180
-360
44.845
0
47.803
0
46.324
0
180
44.845
0
640
G 1 3/4
11
2.31
53.746
0
-360
52.267
0
-180
-360
50.788
0
53.746
0
52.267
0
180
50.788
0
640
G 2
11
2.31
59.614
0
-360
58.135
0
-180
-360
56.656
0
59.614
0
58.135
0
180
56.656
0
640
G 2 1/4
11
2.31
65.71
0
-434
64.231
0
-217
-434
62.752
0
65.71
0
64.231
0
217
62.752
0
640
G 2 1/2
11
2.31
75.184
0
-434
73.705
0
-217
-434
72.226
0
75.184
0
73.705
0
217
72.226
0
640
G 2 3/4
11
2.31
81.534
0
-434
80.055
0
-217
-434
78.576
0
81.534
0
80.055
0
217
78.576
0
640
G 3
11
2.31
87.884
0
-434
86.405
0
-217
-434
84.926
0
87.884
0
86.405
0
217
84.926
0
640
G 3 1/2
11
2.31
100.33
0
-434
98.851
0
-217
-434
97.372
0
100.33
0
98.851
0
217
97.372
0
640
G 4
11
2.31
113.03
0
-434
111.551
0
-217
-434
110.072
0
113.03
0
111.551
0
217
110.072
0
640
G 4 1/5
11
2.31
125.73
0
-434
124.251
0
-217
-434
122.772
0
125.73
0
124.251
0
217
122.772
0
640
G 5
11
2.31
138.43
0
-434
136.951
0
-217
-434
135.472
0
138.43
0
136.951
0
217
135.472
0
640
G 5 1/2
11
2.31
151.13
0
-434
149.651
0
-217
-434
148.172
0
151.13
0
149.651
0
217
148.172
0
640
G 6
11
2.31
163.83
0
-434
162.351
0
-217
-434
160.872
0
163.83
0
162.351
0
217
160.872
0
640
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