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British Standard Brass (B.S.B.)
Thread Form
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- p = Pitch = 1/TPI
- h = Basic Depth of Thread = 0.640327p
- r = Basic Radius = 0.137329p
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Thread Tables
| Nominal Diameter |
T.P.I |
Basic Depth of Thread |
Basic Major Diameter |
Basic Effective Diameter |
Basic Minor Diameter |
Tapping Drill |
Clearing Drill |
| (inch) |
(n/a) |
(inch) |
(inch) |
(inch) |
(inch) |
(mm) |
(mm) |
| 1/8 |
26 |
0.0246 |
0.125 |
0.102 |
0.0757 |
2 |
3.3 |
| 1/4 |
26 |
0.0246 |
0.25 |
0.2254 |
0.2007 |
5.2 |
6.5 |
| 3/8 |
26 |
0.0246 |
0.375 |
0.3504 |
0.3257 |
8.5 |
9.7 |
| 1/2 |
26 |
0.0246 |
0.5 |
0.4754 |
0.4507 |
11.6 |
13 |
| 5/8 |
26 |
0.0246 |
0.625 |
0.6004 |
0.5657 |
14.75 |
16.25 |
| 3/4 |
26 |
0.0246 |
0.75 |
0.7254 |
0.7007 |
18 |
19.25 |
| 7/8 |
26 |
0.0246 |
0.875 |
0.8504 |
0.8257 |
21.25 |
22.5 |
| 1 |
26 |
0.0246 |
1 |
0.9754 |
0.9507 |
24.25 |
25.75 |
| 1,1/8 |
26 |
0.0246 |
1.125 |
1.1004 |
1.0757 |
27.5 |
29 |
| 1,1/4 |
26 |
0.0246 |
1.25 |
1.2254 |
1.2007 |
30.75 |
32 |
| 1,1/2 |
26 |
0.0246 |
1.5 |
1.4754 |
1.4507 |
37 |
38.5 |
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