MARYLAND METRICS
THREAD DATA CHARTS
PIPE THREAD -- BRITISH STANDARD PIPE PARALLEL -- BSPP/BSPFPIPE THREAD -- JAPANESE PIPE PARALLEL -- PF
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MARYLAND METRICS -- THREAD DATA CHART:
British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF)
Major Dia
External
Internal
Size
Size
pitch
Major Dia
Pitch Dia
Minor Dia
Minor Dia
Pitch Dia
Major Dia
Tap Drill
Thread
Designation
mm
mm
TPI
Class
Max
Min
Max
Min
Max
Min
Class
Min
Max
Min
Max
Min
Max
mm
G 1/16
7.723
0.907
28
A
7.723
7.509
7.142
7.035
6.561
6.561
6.834
7.142
7.249
7.723
6.7
G 1/16
7.723
0.907
28
B
7.723
7.509
7.142
6.928
6.561
6.7
G 1/8
9.728
0.907
28
A
9.728
9.514
9.147
9.040
8.566
8.566
8.848
9.147
9.254
9.728
8.7
G 1/8
9.728
0.907
28
B
9.728
9.514
9.147
8.933
8.566
8.7
G 1/4
13.157
1.337
19
A
13.157
12.907
12.301
12.176
11.445
11.445
11.89
12.301
12.426
13.157
11.6
G 1/4
13.157
1.337
19
B
13.157
12.907
12.301
12.051
11.445
11.6
G 3/8
16.662
1.337
19
A
16.662
16.412
15.806
15.681
14.950
14.95
15.395
15.806
15.931
16.662
15
G 3/8
16.662
1.337
19
B
16.662
16.412
15.806
15.556
14.950
15
G 1/2
20.955
1.814
14
A
20.955
20.671
19.793
19.651
18.631
18.631
19.172
19.793
19.935
20.955
19
G 1/2
20.955
1.814
14
B
20.955
20.671
19.793
19.509
18.631
19
G 5/8
22.911
1.814
14
A
22.911
22.627
21.749
21.607
20.587
20.587
21.128
21.749
21.891
22.911
20.75
G 5/8
22.911
1.814
14
B
22.911
22.627
21.749
21.465
20.587
20.75
G 3/4
26.441
1.814
14
A
26.441
26.157
25.279
25.137
24.117
24.117
24.658
25.279
25.421
26.441
24.5
G 3/4
26.441
1.814
14
B
26.441
26.157
25.279
24.995
24.117
24.5
G 7/8
30.201
1.814
14
A
30.201
29.917
29.039
28.897
27.877
27.877
28.418
29.039
29.181
30.201
28
G 7/8
30.201
1.814
14
B
30.201
29.917
29.039
28.755
27.877
28
G 1
33.249
2.309
11
A
33.249
32.889
31.770
31.590
30.291
30.291
30.931
31.77
31.95
33.249
30.5
G 1
33.249
2.309
11
B
33.249
32.889
31.770
31.410
30.291
30.5
G 1 1/8
37.897
2.309
11
A
37.897
37.537
36.418
36.238
34.939
34.939
35.579
36.418
36.598
37.897
35
G 1 1/8
37.897
2.309
11
B
37.897
37.537
36.418
36.058
34.939
35
G 1 1/4
41.910
2.309
11
A
41.910
41.550
40.431
40.251
38.952
38.952
39.592
40.431
40.611
41.910
39.5
G 1 1/4
41.910
2.309
11
B
41.910
41.550
40.431
40.071
38.952
39.5
G 1 3/8
44.323
2.309
11
44.323
limited data available
41.365
42.005
limited data available
41.5
G 1 1/2
47.803
2.309
11
A
47.803
47.443
46.324
46.144
44.845
44.845
45.485
46.324
46.504
47.803
45
G 1 1/2
47.803
2.309
11
B
47.803
47.443
46.324
45.964
44.845
45
G 1 5/8
52.000
2.309
11
52.000
limited data available
49.030
49.670
limited data available
49.5
G 1 3/4
53.746
2.309
11
A
53.746
53.386
52.267
52.087
50.788
50.788
51.428
52.267
52.447
53.746
51
G 1 3/4
53.746
2.309
11
B
53.746
53.386
52.267
51.907
50.788
51
G 2
59.614
2.309
11
A
59.614
59.254
58.135
57.955
56.656
56.656
57.296
58.135
58.315
59.614
57
G 2
59.614
2.309
11
B
59.614
59.254
58.135
57.775
56.656
57
G 2 1/4
65.710
2.309
11
A
65.710
65.276
64.231
64.014
62.752
62.752
63.392
64.231
64.448
65.710
63
G 2 1/4
65.710
2.309
11
B
65.710
65.276
64.231
63.797
62.752
63
G 2 1/2
75.184
2.309
11
A
75.184
74.750
73.705
73.488
72.226
72.226
72.866
73.705
73.922
75.184
72.5
G 2 1/2
75.184
2.309
11
B
75.184
74.750
73.705
73.271
72.226
72.5
G 2 3/4
81.534
2.309
11
A
81.534
81.100
80.055
79.838
78.576
78.576
79.216
80.055
80.272
81.534
79
G 2 3/4
81.534
2.309
11
B
81.534
81.100
80.055
79.621
78.576
79
G 3
87.884
2.309
11
A
87.884
87.450
86.405
86.188
84.926
84.926
85.566
86.405
86.622
87.884
85.5
G 3
87.884
2.309
11
B
87.884
87.450
86.405
85.971
84.926
85.5
G 3 1/4
93.980
2.309
11
93.984
limited data available
91.022
91.660
limited data available
91
G 3 1/2
100.330
2.309
11
A
100.330
99.896
98.851
98.634
97.372
97.372
98.012
98.851
99.068
100.330
97.75
G 3 1/2
100.330
2.309
11
B
100.330
99.896
98.851
98.417
97.372
97.75
G 3 3/4
106.680
2.309
11
106.680
limited data available
103.722
104.300
limited data available
104
G 4
113.030
2.309
11
A
113.030
112.596
111.551
111.334
110.072
110.072
110.712
111.551
111.768
113.030
110.5
G 4
113.030
2.309
11
B
113.030
112.596
111.551
111.117
110.072
110.5
G 4 1/2
125.730
2.309
11
A
125.730
125.296
124.251
124.034
122.772
122.772
123.412
124.251
124.468
125.730
123
G 4 1/2
125.730
2.309
11
B
125.730
125.296
124.251
123.817
122.772
123
G 5
138.430
2.309
11
A
138.430
137.996
136.951
136.734
135.472
135.472
136.112
136.951
137.168
138.430
136
G 5
138.430
2.309
11
B
138.430
137.996
136.951
136.517
135.472
136
G 5 1/2
151.130
2.309
11
A
151.130
150.696
149.651
149.434
148.172
148.172
148.812
149.651
149.868
151.130
148.5
G 5 1/2
151.130
2.309
11
B
151.130
150.696
149.651
149.217
148.172
148.5
G 6
163.830
2.309
11
A
163.830
163.396
162.351
162.134
160.872
160.872
161.512
162.351
162.568
163.830
161.5
G 6
163.830
2.309
11
B
163.830
163.396
162.351
161.917
160.872
161.5
Note: Class B applies only to external threads. Internal threads are Class A.
PIPE THREAD -- BRITISH STANDARD PIPE TAPER -- BSPT
PIPE THREAD -- JAPANESE PIPE TAPER -- PT
MARYLAND METRICS -- THREAD DATA CHART:
British Pipe Thread ( Whitworth Form) -- Taper (BSPT)
Thread
Nominal
Thread
Major
Pitch
Threads
Pitch
Minor
Thread
Rounding
Effective
Tap
Designation
Size
Form
Diameter
mm
per
Diameter
Diameter
Height
r
Thread
Drill
Type
mm
p
inch
mm
Male Thd.
H1
Length mm
Diameter
BSPT
BSPT
d=D
tpi
d2=D2
d3
External
mm
R 1/16
1/16"
BSPT
7.723
0.907
28
7.142
6.561
0.581
0.125
2.5
6.4
R 1/8
1/8"
BSPT
9.728
0.907
28
9.147
8.566
0.581
0.125
2.5
8.4
R 1/4
1/4"
BSPT
13.157
1.337
19
12.301
11.445
0.856
0.184
3.7
11.2
R 3/8
3/8"
BSPT
16.662
1.337
19
15.806
14.95
0.856
0.184
3.7
14.75
R 1/2
1/2"
BSPT
20.955
1.814
14
19.793
18.631
1.162
0.249
5
18.25
R 3/4
3/4"
BSPT
26.441
1.814
14
25.279
24.117
1.162
0.249
5
23.75
R 1
1"
BSPT
33.249
2.309
11
31.77
30.291
1.479
0.317
6.4
30
R 1 1/4
1 1/4"
BSPT
41.91
2.309
11
40.431
38.952
1.479
0.317
6.4
38.5
R 1 1/2
1 1/2"
BSPT
47.803
2.309
11
46.324
44.845
1.479
0.317
6.4
44.5
R 2
2"
BSPT
59.614
2.309
11
58.135
56.656
1.479
0.317
7.5
56
R 2 1/2
2 1/2"
BSPT
75.184
2.309
11
73.705
72.226
1.479
0.317
9.2
71
R 3
3"
BSPT
87.884
2.309
11
86.405
84.926
1.479
0.317
9.2
85.5
R 4
4"
BSPT
113.03
2.309
11
111.551
110.072
1.479
0.317
10.4
110.5
R 5
5"
BSPT
138.43
2.309
11
136.951
135.472
1.479
0.317
11.5
136
R 6
6"
BSPT
163.83
2.309
11
162.351
160.872
1.479
0.317
11.5
161.5
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copyright 1998, 2000, 2001, 2002, 2006, 2007 maryland metrics -- all rights reserved -- ver cc31l thddat7.htm
| MARYLAND METRICS -- THREAD DATA CHART: | |||||||||
| British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) |
| Major Dia | External | Internal | |||||||||||||||||
| Size | Size | pitch | Major Dia | Pitch Dia | Minor Dia | Minor Dia | Pitch Dia | Major Dia | Tap Drill | ||||||||||
|
Thread Designation |
mm | mm | TPI | Class | Max | Min | Max | Min | Max | Min | Class | Min | Max | Min | Max | Min | Max | mm | |
| G 1/16 | 7.723 | 0.907 | 28 | A | 7.723 | 7.509 | 7.142 | 7.035 | 6.561 | 6.561 | 6.834 | 7.142 | 7.249 | 7.723 | 6.7 | ||||
| G 1/16 | 7.723 | 0.907 | 28 | B | 7.723 | 7.509 | 7.142 | 6.928 | 6.561 | 6.7 | |||||||||
| G 1/8 | 9.728 | 0.907 | 28 | A | 9.728 | 9.514 | 9.147 | 9.040 | 8.566 | 8.566 | 8.848 | 9.147 | 9.254 | 9.728 | 8.7 | ||||
| G 1/8 | 9.728 | 0.907 | 28 | B | 9.728 | 9.514 | 9.147 | 8.933 | 8.566 | 8.7 | |||||||||
| G 1/4 | 13.157 | 1.337 | 19 | A | 13.157 | 12.907 | 12.301 | 12.176 | 11.445 | 11.445 | 11.89 | 12.301 | 12.426 | 13.157 | 11.6 | ||||
| G 1/4 | 13.157 | 1.337 | 19 | B | 13.157 | 12.907 | 12.301 | 12.051 | 11.445 | 11.6 | |||||||||
| G 3/8 | 16.662 | 1.337 | 19 | A | 16.662 | 16.412 | 15.806 | 15.681 | 14.950 | 14.95 | 15.395 | 15.806 | 15.931 | 16.662 | 15 | ||||
| G 3/8 | 16.662 | 1.337 | 19 | B | 16.662 | 16.412 | 15.806 | 15.556 | 14.950 | 15 | |||||||||
| G 1/2 | 20.955 | 1.814 | 14 | A | 20.955 | 20.671 | 19.793 | 19.651 | 18.631 | 18.631 | 19.172 | 19.793 | 19.935 | 20.955 | 19 | ||||
| G 1/2 | 20.955 | 1.814 | 14 | B | 20.955 | 20.671 | 19.793 | 19.509 | 18.631 | 19 | |||||||||
| G 5/8 | 22.911 | 1.814 | 14 | A | 22.911 | 22.627 | 21.749 | 21.607 | 20.587 | 20.587 | 21.128 | 21.749 | 21.891 | 22.911 | 20.75 | ||||
| G 5/8 | 22.911 | 1.814 | 14 | B | 22.911 | 22.627 | 21.749 | 21.465 | 20.587 | 20.75 | |||||||||
| G 3/4 | 26.441 | 1.814 | 14 | A | 26.441 | 26.157 | 25.279 | 25.137 | 24.117 | 24.117 | 24.658 | 25.279 | 25.421 | 26.441 | 24.5 | ||||
| G 3/4 | 26.441 | 1.814 | 14 | B | 26.441 | 26.157 | 25.279 | 24.995 | 24.117 | 24.5 | |||||||||
| G 7/8 | 30.201 | 1.814 | 14 | A | 30.201 | 29.917 | 29.039 | 28.897 | 27.877 | 27.877 | 28.418 | 29.039 | 29.181 | 30.201 | 28 | ||||
| G 7/8 | 30.201 | 1.814 | 14 | B | 30.201 | 29.917 | 29.039 | 28.755 | 27.877 | 28 | |||||||||
| G 1 | 33.249 | 2.309 | 11 | A | 33.249 | 32.889 | 31.770 | 31.590 | 30.291 | 30.291 | 30.931 | 31.77 | 31.95 | 33.249 | 30.5 | ||||
| G 1 | 33.249 | 2.309 | 11 | B | 33.249 | 32.889 | 31.770 | 31.410 | 30.291 | 30.5 | |||||||||
| G 1 1/8 | 37.897 | 2.309 | 11 | A | 37.897 | 37.537 | 36.418 | 36.238 | 34.939 | 34.939 | 35.579 | 36.418 | 36.598 | 37.897 | 35 | ||||
| G 1 1/8 | 37.897 | 2.309 | 11 | B | 37.897 | 37.537 | 36.418 | 36.058 | 34.939 | 35 | |||||||||
| G 1 1/4 | 41.910 | 2.309 | 11 | A | 41.910 | 41.550 | 40.431 | 40.251 | 38.952 | 38.952 | 39.592 | 40.431 | 40.611 | 41.910 | 39.5 | ||||
| G 1 1/4 | 41.910 | 2.309 | 11 | B | 41.910 | 41.550 | 40.431 | 40.071 | 38.952 | 39.5 | |||||||||
| G 1 3/8 | 44.323 | 2.309 | 11 | 44.323 | limited data available | 41.365 | 42.005 | limited data available | 41.5 | ||||||||||
| G 1 1/2 | 47.803 | 2.309 | 11 | A | 47.803 | 47.443 | 46.324 | 46.144 | 44.845 | 44.845 | 45.485 | 46.324 | 46.504 | 47.803 | 45 | ||||
| G 1 1/2 | 47.803 | 2.309 | 11 | B | 47.803 | 47.443 | 46.324 | 45.964 | 44.845 | 45 | |||||||||
| G 1 5/8 | 52.000 | 2.309 | 11 | 52.000 | limited data available | 49.030 | 49.670 | limited data available | 49.5 | ||||||||||
| G 1 3/4 | 53.746 | 2.309 | 11 | A | 53.746 | 53.386 | 52.267 | 52.087 | 50.788 | 50.788 | 51.428 | 52.267 | 52.447 | 53.746 | 51 | ||||
| G 1 3/4 | 53.746 | 2.309 | 11 | B | 53.746 | 53.386 | 52.267 | 51.907 | 50.788 | 51 | |||||||||
| G 2 | 59.614 | 2.309 | 11 | A | 59.614 | 59.254 | 58.135 | 57.955 | 56.656 | 56.656 | 57.296 | 58.135 | 58.315 | 59.614 | 57 | ||||
| G 2 | 59.614 | 2.309 | 11 | B | 59.614 | 59.254 | 58.135 | 57.775 | 56.656 | 57 | |||||||||
| G 2 1/4 | 65.710 | 2.309 | 11 | A | 65.710 | 65.276 | 64.231 | 64.014 | 62.752 | 62.752 | 63.392 | 64.231 | 64.448 | 65.710 | 63 | ||||
| G 2 1/4 | 65.710 | 2.309 | 11 | B | 65.710 | 65.276 | 64.231 | 63.797 | 62.752 | 63 | |||||||||
| G 2 1/2 | 75.184 | 2.309 | 11 | A | 75.184 | 74.750 | 73.705 | 73.488 | 72.226 | 72.226 | 72.866 | 73.705 | 73.922 | 75.184 | 72.5 | ||||
| G 2 1/2 | 75.184 | 2.309 | 11 | B | 75.184 | 74.750 | 73.705 | 73.271 | 72.226 | 72.5 | |||||||||
| G 2 3/4 | 81.534 | 2.309 | 11 | A | 81.534 | 81.100 | 80.055 | 79.838 | 78.576 | 78.576 | 79.216 | 80.055 | 80.272 | 81.534 | 79 | ||||
| G 2 3/4 | 81.534 | 2.309 | 11 | B | 81.534 | 81.100 | 80.055 | 79.621 | 78.576 | 79 | |||||||||
| G 3 | 87.884 | 2.309 | 11 | A | 87.884 | 87.450 | 86.405 | 86.188 | 84.926 | 84.926 | 85.566 | 86.405 | 86.622 | 87.884 | 85.5 | ||||
| G 3 | 87.884 | 2.309 | 11 | B | 87.884 | 87.450 | 86.405 | 85.971 | 84.926 | 85.5 | |||||||||
| G 3 1/4 | 93.980 | 2.309 | 11 | 93.984 | limited data available | 91.022 | 91.660 | limited data available | 91 | ||||||||||
| G 3 1/2 | 100.330 | 2.309 | 11 | A | 100.330 | 99.896 | 98.851 | 98.634 | 97.372 | 97.372 | 98.012 | 98.851 | 99.068 | 100.330 | 97.75 | ||||
| G 3 1/2 | 100.330 | 2.309 | 11 | B | 100.330 | 99.896 | 98.851 | 98.417 | 97.372 | 97.75 | |||||||||
| G 3 3/4 | 106.680 | 2.309 | 11 | 106.680 | limited data available | 103.722 | 104.300 | limited data available | 104 | ||||||||||
| G 4 | 113.030 | 2.309 | 11 | A | 113.030 | 112.596 | 111.551 | 111.334 | 110.072 | 110.072 | 110.712 | 111.551 | 111.768 | 113.030 | 110.5 | ||||
| G 4 | 113.030 | 2.309 | 11 | B | 113.030 | 112.596 | 111.551 | 111.117 | 110.072 | 110.5 | |||||||||
| G 4 1/2 | 125.730 | 2.309 | 11 | A | 125.730 | 125.296 | 124.251 | 124.034 | 122.772 | 122.772 | 123.412 | 124.251 | 124.468 | 125.730 | 123 | ||||
| G 4 1/2 | 125.730 | 2.309 | 11 | B | 125.730 | 125.296 | 124.251 | 123.817 | 122.772 | 123 | |||||||||
| G 5 | 138.430 | 2.309 | 11 | A | 138.430 | 137.996 | 136.951 | 136.734 | 135.472 | 135.472 | 136.112 | 136.951 | 137.168 | 138.430 | 136 | ||||
| G 5 | 138.430 | 2.309 | 11 | B | 138.430 | 137.996 | 136.951 | 136.517 | 135.472 | 136 | |||||||||
| G 5 1/2 | 151.130 | 2.309 | 11 | A | 151.130 | 150.696 | 149.651 | 149.434 | 148.172 | 148.172 | 148.812 | 149.651 | 149.868 | 151.130 | 148.5 | ||||
| G 5 1/2 | 151.130 | 2.309 | 11 | B | 151.130 | 150.696 | 149.651 | 149.217 | 148.172 | 148.5 | |||||||||
| G 6 | 163.830 | 2.309 | 11 | A | 163.830 | 163.396 | 162.351 | 162.134 | 160.872 | 160.872 | 161.512 | 162.351 | 162.568 | 163.830 | 161.5 | ||||
| G 6 | 163.830 | 2.309 | 11 | B | 163.830 | 163.396 | 162.351 | 161.917 | 160.872 | 161.5 | |||||||||
PIPE THREAD -- BRITISH STANDARD PIPE TAPER -- BSPT
PIPE THREAD -- JAPANESE PIPE TAPER -- PT
MARYLAND METRICS -- THREAD DATA CHART:
British Pipe Thread ( Whitworth Form) -- Taper (BSPT)
Click here to return to the
thread data chart page index.
Thread
Nominal
Thread
Major
Pitch
Threads
Pitch
Minor
Thread
Rounding
Effective
Tap
Designation
Size
Form
Diameter
mm
per
Diameter
Diameter
Height
r
Thread
Drill
Type
mm
p
inch
mm
Male Thd.
H1
Length mm
Diameter
BSPT
BSPT
d=D
tpi
d2=D2
d3
External
mm
R 1/16
1/16"
BSPT
7.723
0.907
28
7.142
6.561
0.581
0.125
2.5
6.4
R 1/8
1/8"
BSPT
9.728
0.907
28
9.147
8.566
0.581
0.125
2.5
8.4
R 1/4
1/4"
BSPT
13.157
1.337
19
12.301
11.445
0.856
0.184
3.7
11.2
R 3/8
3/8"
BSPT
16.662
1.337
19
15.806
14.95
0.856
0.184
3.7
14.75
R 1/2
1/2"
BSPT
20.955
1.814
14
19.793
18.631
1.162
0.249
5
18.25
R 3/4
3/4"
BSPT
26.441
1.814
14
25.279
24.117
1.162
0.249
5
23.75
R 1
1"
BSPT
33.249
2.309
11
31.77
30.291
1.479
0.317
6.4
30
R 1 1/4
1 1/4"
BSPT
41.91
2.309
11
40.431
38.952
1.479
0.317
6.4
38.5
R 1 1/2
1 1/2"
BSPT
47.803
2.309
11
46.324
44.845
1.479
0.317
6.4
44.5
R 2
2"
BSPT
59.614
2.309
11
58.135
56.656
1.479
0.317
7.5
56
R 2 1/2
2 1/2"
BSPT
75.184
2.309
11
73.705
72.226
1.479
0.317
9.2
71
R 3
3"
BSPT
87.884
2.309
11
86.405
84.926
1.479
0.317
9.2
85.5
R 4
4"
BSPT
113.03
2.309
11
111.551
110.072
1.479
0.317
10.4
110.5
R 5
5"
BSPT
138.43
2.309
11
136.951
135.472
1.479
0.317
11.5
136
R 6
6"
BSPT
163.83
2.309
11
162.351
160.872
1.479
0.317
11.5
161.5
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