0.000
There are three standard series of Whitworth thread :
Example of external B.S.W. close class : 1/4-20 B.S.W. (close) bolt
Pitch :
P = |
0 |
mm |
Height of fundamental triangle :
H = |
0 |
mm |
Height of thread :
h = |
0 |
mm |
Radius at the top and bottom of the threads :
r = |
0 |
mm |
Major diameter (mm)
0.000
0.000
0.000
=
Minor diameter (mm)
0.000
0.000
0.000
=
Pitch diameter (mm)
0.000
0.000
0.000
=
For not specified tolerance, we use the pitch tolerance to calculate the average value.
Size | B.S.W. tpi | B.S.F tpi | Whit. S tpi |
---|---|---|---|
1/4 | 20 | 26 | 32 |
5/16 | 18 | 22 | 26 32 |
3/8 | 16 | 20 | 26 32 |
7/16 | 14 | 18 | 26 |
1/2 | 12 | 16 | 20 26 |
9/16 | 12 | 16 | 20 26 |
5/8 | 11 | 14 | 20 26 |
11/16 | 11 | 14 | 16 20 26 |
3/4 | 10 | 12 | 16 20 26 |
13/16 | 12 | 16 20 26 | |
7/8 | 9 | 11 | 20 |
1 1/16 | 12 20 | ||
1 1/8 | 7 | 9 | 12 20 |
1 3/16 | 7 | 9 | 12 20 |
1 1/4 | 7 | 9 | 12 20 |
1 5/16 | 12 20 | ||
1 3/8 | 8 | 12 20 | |
1 7/16 | 12 20 | ||
1 1/2 | 6 | 8 | 12 20 |
1 5/8 | 8 | 12 16 20 | |
1 3/4 | 5 | 7 | 12 16 20 |
1 7/8 | 12 16 20 | ||
2 | 4 1/2 | 7 | 12 16 20 |
2 1/8 | 8 12 16 | ||
2 1/4 | 4 | 6 | 8 12 16 |
2 3/8 | 8 12 16 | ||
2 1/2 | 4 | 6 | 8 12 16 |
2 5/8 | 8 12 16 | ||
2 3/4 | 3 1/2 | 6 | 8 12 16 |
2 7/8 | 8 12 16 | ||
3 | 3 1/2 | 5 | 8 12 16 |
3 1/8 | 8 16 | ||
3 1/4 | 3 1/4 | 4 1/2 | 8 16 |
3 3/8 | 8 16 | ||
3 1/2 | 3 1/4 | 4 1/2 | 8 16 |
3 5/8 | 8 16 | ||
3 3/4 | 3 | 4 1/2 | 8 16 |
3 7/8 | 8 16 | ||
4 | 3 | 4 1/2 | 8 16 |
4 1/8 | 8 16 | ||
4 1/4 | 4 | 8 16 | |
4 3/8 | 4 8 16 | ||
4 1/2 | 2 7/8 | 4 8 16 | |
4 5/8 | 4 8 16 | ||
4 3/4 | 4 8 16 | ||
4 7/8 | 4 8 16 | ||
5 | 2 3/4 | 4 8 16 | |
5 1/8 | 4 8 16 | ||
5 1/4 | 4 8 16 | ||
5 3/8 | 4 8 16 | ||
5 1/2 | 2 5/8 | 4 8 16 | |
5 5/8 | 4 8 16 | ||
5 3/4 | 4 8 16 | ||
5 7/8 | 4 8 16 | ||
6 | 2 1/2 | 4 8 16 | |
6 1/4 | 4 8 16 | ||
6 1/2 | 4 8 16 | ||
6 3/4 | 4 8 16 | ||
7 | 4 6 8 12 16 |