British Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) |
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Thread |
Nominal |
Thread |
Major |
Pitch |
Threads |
Pitch |
Minor |
Thread |
Tap |
G1/8 |
1/8" |
BSPP |
9.728 |
0.907 |
28 |
9.147 |
8.566 |
0.581 |
8.70 |
G1/4 |
1/4" |
BSPP |
13.157 |
1.337 |
19 |
12.301 |
11.445 |
0.856 |
11.60 |
G3/8 |
3/8" |
BSPP |
16.662 |
1.337 |
19 |
15.806 |
14.950 |
0.856 |
15.00 |
G1/2 |
1/2" |
BSPP |
20.955 |
1.814 |
14 |
19.793 |
18.631 |
1.162 |
19.00 |
G5/8 |
5/8" |
BSPP |
22.911 |
1.814 |
14 |
21.749 |
20.587 |
1.162 |
20.75 |
G3/4 |
3/4" |
BSPP |
26.441 |
1.814 |
14 |
25.279 |
24.117 |
1.162 |
24.50 |
G7/8 |
7/8" |
BSPP |
30.201 |
1.814 |
14 |
29.039 |
27.877 |
1.162 |
28.00 |
G1 |
1" |
BSPP |
33.249 |
2.309 |
11 |
31.770 |
30.291 |
1.479 |
30.50 |
G1-1/8 |
1-1/8" |
BSPP |
37.897 |
2.309 |
11 |
36.418 |
34.939 |
1.479 |
35.00 |
G1-1/4 |
1-1/4" |
BSPP |
41.910 |
2.309 |
11 |
40.431 |
38.952 |
1.479 |
39.50 |
G1-3/8 |
1-3/8" |
BSPP |
44.323 |
2.309 |
11 |
42.844 |
41.365 |
1.479 |
41.50 |
G1-1/2 |
1-1/2" |
BSPP |
47.803 |
2.309 |
11 |
46.324 |
44.845 |
1.479 |
45.00 |
G1-3/4 |
1-3/4" |
BSPP |
53.746 |
2.309 |
11 |
52.267 |
50.788 |
1.479 |
51.00 |
G2 |
2" |
BSPP |
59.614 |
2.309 |
11 |
58.135 |
56.656 |
1.479 |
57.00 |
G2-1/4 |
2-1/4" |
BSPP |
65.71 |
2.309 |
11 |
64.231 |
62.752 |
1.479 |
63.00 |
G2-1/2 |
2-1/2" |
BSPP |
75.184 |
2.309 |
11 |
73.705 |
72.226 |
1.479 |
72.50 |
G2-3/4 |
2-3/4" |
BSPP |
81.534 |
2.309 |
11 |
80.055 |
78.576 |
1.479 |
79.00 |
3 |
3" |
BSPP |
87.884 |
2.309 |
11 |
86.405 |
84.926 |
1.479 |
85.50 |
G3-1/4 |
3-1/4" |
BSPP |
93.98 |
2.309 |
11 |
92.501 |
91.022 |
1.479 |
91.00 |
G3-1/2 |
3-1/2" |
BSPP |
100.33 |
2.309 |
11 |
98.351 |
97.372 |
1.479 |
97.75 |
G3-3/4 |
3-3/4" |
BSPP |
106.68 |
2.309 |
11 |
105.201 |
103.722 |
1.479 |
104.00 |
G4 |
4" |
BSPP |
113.03 |
2.309 |
11 |
111.55 |
110.072 |
1.479 |
110.50 |
G4-1/2 |
4-1/2" |
BSPP |
125.73 |
2.309 |
11 |
124.251 |
122.772 |
1.479 |
123.00 |
G5 |
5" |
BSPP |
138.43 |
2.309 |
11 |
136.951 |
135.472 |
1.479 |
136.00 |
G5-1/2 |
5-1/2" |
BSPP |
151.13 |
2.309 |
11 |
149.651 |
148.172 |
1.479 |
148.50 |
G6 |
6" |
BSPP |
163.83 |
2.309 |
11 |
162.351 |
160.872 |
1.479 |
161.50 |