British Standard Pipe Taper (Bspt) Threads Size Chart
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1British Standard Pipe Taper (BSPT) Threads Size Chart
Major diameter
Corresponding pipe
of the thread
Gauge
Thread
Threads
Pitch
length
Thick‐
size
per inch
[mm]
[mm]
[mm]
[in]
DN
OD [mm]
OD [in]
ness
[mm]
1/16
28
0.907
7.723
0.304
4
1/8
28
0.907
9.728
0.383
4
6
10.2
0.4
2
1/4
19
1.337
13.157
0.518
6
8
13.5
0.53
2.3
3/8
19
1.337
16.662
0.656
6.4
10
17.2
0.68
2.3
1/2
14
1.814
20.995
0.825
8.2
15
21.3
0.84
2.6
5/8
14
1.814
22.911
0.902
16
2.6
3/4
14
1.814
26.441
1.041
9.5
20
26.9
1.06
2.6
1
11
2.309
33.249
1.309
10.4
25
33.7
1.33
3.2
1¼
11
2.309
41.91
1.65
12.7
32
42.4
1.67
3.2
1½
11
2.309
47.803
1.882
12.7
40
48.3
1.9
3.2
2
11
2.309
59.614
2.347
15.9
50
60.3
2.37
3.6
2½
11
2.309
75.184
2.96
17.5
65
76.1
3
3.6
3
11
2.309
87.884
3.46
20.6
80
88.9
3.5
4
4
11
2.309
113.03
4.45
25.5
100
114.3
4.5
4.5
5
11
2.309
138.43
5.45
28.6
125
139.7
5.5
5
6
11
2.309
163.83
6.45
28.6
150
165.1
6.5
5
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