PIPE THREAD -- BRITISH STANDARD PIPE PARALLEL -- BSPP/BSPF
PIPE THREAD -- JAPANESE PIPE PARALLEL -- PF
| British
Pipe Thread ( Whitworth Form) -- Parallel (BSPP/BSPF) |
Thread
Designation
BSPP/BSPF |
Nominal
Size
BSPP/BSPF |
Major
Diameter
mm
d=D |
Pitch
mm
P |
Threads
per
inch
tpi |
Pitch
Diameter
mm
d2=D2 |
Minor
Diameter
Screw Thd.
D1 |
Thread
Height
H1 |
Tap
Drill
Diameter
mm |
| G 1/8 |
1/8" |
9.728 |
0.907 |
28 |
9.147 |
8.566 |
0.581 |
8.7 |
| G 1/4 |
1/4" |
13.157 |
1.337 |
19 |
12.301 |
11.445 |
0.856 |
11.6 |
| G 3/8 |
3/8" |
16.662 |
1.337 |
19 |
15.806 |
14.95 |
0.856 |
15 |
| G 1/2 |
1/2" |
20.955 |
1.814 |
14 |
19.793 |
18.631 |
1.162 |
19 |
| G 5/8 |
5/8" |
22.911 |
1.814 |
14 |
21.749 |
20.587 |
1.162 |
20.75 |
| G 3/4 |
3/4" |
26.441 |
1.814 |
14 |
25.279 |
24.117 |
1.162 |
24.5 |
| G 7/8 |
7/8" |
30.201 |
1.814 |
14 |
29.039 |
27.877 |
1.162 |
28 |
| G 1 |
1" |
33.249 |
2.309 |
11 |
31.77 |
30.291 |
1.479 |
30.5 |
| G 1 1/8
|
1 1/8" |
37.897 |
2.309 |
11 |
36.418 |
34.939 |
1.479 |
35 |
| G 1 1/4
|
1 1/4" |
41.91 |
2.309 |
11 |
40.431 |
38.952 |
1.479 |
39.5 |
| G 1 3/8 |
1 3/8" |
44.323 |
2.309 |
11 |
42.844 |
41.365 |
1.479 |
41.5 |
| G 1 1/2
|
1 1/2" |
47.803 |
2.309 |
11 |
46.324 |
44.845 |
1.479 |
45 |
| G 1 3/4
|
1 3/4" |
53.746 |
2.309 |
11 |
52.267 |
50.788 |
1.479 |
51 |
| G 2 |
2" |
59.614 |
2.309 |
11 |
58.135 |
56.656 |
1.479 |
57 |
| G 2 1/4
|
2 1/4" |
65.71 |
2.309 |
11 |
64.231 |
62.752 |
1.479 |
63 |
| G 2 1/2
|
2 1/2" |
75.184 |
2.309 |
11 |
73.705 |
72.226 |
1.479 |
72.5 |
| G 2 3/4
|
2 3/4" |
81.534 |
2.309 |
11 |
80.055 |
78.576 |
1.479 |
79 |
| G 3 |
3" |
87.884 |
2.309 |
11 |
86.405 |
84.926 |
1.479 |
85.5 |
| G 3 1/4
|
3 1/4" |
93.98 |
2.309 |
11 |
92.501 |
91.022 |
1.479 |
91 |
| G 3 1/2
|
3 1/2" |
100.33 |
2.309 |
11 |
98.351 |
97.372 |
1.479 |
97.75 |
| G 3 3/4
|
3 3/4" |
106.68 |
2.309 |
11 |
105.201 |
103.722 |
1.479 |
104 |
| G 4 |
4" |
113.03 |
2.309 |
11 |
111.55 |
110.072 |
1.479 |
110.5 |
| G 4 1/2
|
4 1/2" |
125.73 |
2.309 |
11 |
124.251 |
122.772 |
1.479 |
123 |
| G 5 |
5" |
138.43 |
2.309 |
11 |
136.951 |
135.472 |
1.479 |
136 |
| G 5 1/2
|
5 1/2" |
151.13 |
2.309 |
11 |
149.651 |
148.172 |
1.479 |
148.5 |
| G 6 |
6" |
163.83 |
2.309 |
11 |
162.351 |
160.872 |
1.479 |
161.5 |
PIPE THREAD -- BRITISH STANDARD PIPE TAPER -- BSPT
PIPE THREAD -- JAPANESE PIPE TAPER -- PT
| British Pipe Thread (
Whitworth Form) -- Taper (BSPT) |
Thread
Designation
BSPT |
Nominal
Size
BSPT |
Major
Diameter
mm
d=D |
Pitch
mm
P |
Threads
per
inch
tpi |
Pitch
Diameter
mm
d2=D2 |
Minor
Diameter
Screw Thd.
D1 |
Thread
Height
H1 |
Rounding
R |
Tap
Drill
Diameter
mm |
| R 1/16 |
1/16" |
7.723 |
0.907 |
28 |
7.142 |
6.561 |
0.581 |
0.125 |
6.4 |
| R 1/8 |
1/8" |
9.728 |
0.907 |
28 |
9.147 |
8.566 |
0.581 |
0.125 |
8.4 |
| R 1/4 |
1/4" |
13.157 |
1.337 |
19 |
12.301 |
11.445 |
0.856 |
0.184 |
11.2 |
| R 3/8 |
3/8" |
16.662 |
1.337 |
19 |
15.806 |
14.950 |
0.856 |
0.184 |
14.75 |
| R 1/2 |
1/2" |
20.955 |
1.814 |
14 |
19.793 |
18.631 |
1.162 |
0.249 |
18.25 |
| R 3/4 |
3/4" |
26.441 |
1.814 |
14 |
25.279 |
24.117 |
1.162 |
0.249 |
23.75 |
| R 1 |
1" |
33.249 |
2.309 |
11 |
31.77 |
30.291 |
1.479 |
0.317 |
30 |
| R 1 1/4 |
1 1/4" |
41.910 |
2.309 |
11 |
40.431 |
38.952 |
1.479 |
0.317 |
38.5 |
| R 1 1/2 |
1 1/2" |
47.803 |
2.309 |
11 |
46.324 |
44.845 |
1.479 |
0.317 |
44.5 |
| R 2 |
2" |
59.614 |
2.309 |
11 |
58.135 |
56.656 |
1.479 |
0.317 |
56 |
| R 2 1/2 |
2 1/2" |
75.184 |
2.309 |
11 |
73.705 |
72.226 |
1.479 |
0.317 |
71 |
| R 3 |
3" |
87.884 |
2.309 |
11 |
86.405 |
84.926 |
1.479 |
0.317 |
85.5 |
| R 4 |
4" |
113.030 |
2.309 |
11 |
111.551 |
110.072 |
1.479 |
0.317 |
110.5 |
| R 5 |
5" |
138.430 |
2.309 |
11 |
136.951 |
135.472 |
1.479 |
0.317 |
136 |
| R 6 |
6" |
163.830 |
2.309 |
11 |
162.351 |
160.872 |
1.479 |
0.317 |
161.5 |