BSP (British Standard Pipe) Thread Data
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Angle of thread = 55
o
degrees
Nominal Size
(inches)
T P I
Pitch
(inches)
Major Diameter
(inches)
Minor Diameter
(inches)
Tapping Drill Size
1/16
28
0.0357
0.304
0.2583
Letter drill G
(6.6 mm)
1/8
28
0.0357
0.383
0.3372
11/32 inch
(8.73 mm)
1/4
19
0.0526
0.518
0.4546
11.8 mm
(0.4646 inch)
3/8
19
0.0526
0.656
0.5886
15.25 mm
(0.6004 inch)
1/2
14
0.0714
0.825
0.7336
3/4 inch
(19.05 mm)
5/8
14
0.0714
0.902
0.8106
21 mm
(0.8268 inch)
3/4
14
0.0714
1.041
0.9496
24.5 mm
(0.9646 inch)
7/8
14
0.0714
1.189
1.0976
28.25 mm
(1.1122 inch)
1 inch
11
0.0909
1.309
1.1926
30.75 mm
(1.2106 inch)
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