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BS 2693-1-1956
Rough pole double studs with fine pitch(b1=1.5d)
Nom
P
ds max
ds min
b1
L1 min
1/4
28
0.25
0.2435
0.375
0.1250
5/16
24
0.3125
0.3053
0.46875
0.1563
3/8
24
0.375
0.3678
0.5625
0.1875
7/16
20
0.4375
0.4294
0.65625
0.2188
1/2
20
0.5
0.4919
0.75
0.2500
9/16
18
0.5625
0.5538
0.84375
0.2813
5/8
18
0.625
0.6163
0.9375
0.3125
3/4
16
0.75
0.7406
1.125
0.3750
7/8
14
0.875
0.8647
1.3125
0.4375
1
12
1
0.9886
1.5
0.5000
1-1/8
12
1.125
1.1136
1.6875
0.5625
1-1/4
12
1.25
1.2386
1.875
0.6250
1-3/8
12
1.375
1.3636
2.0625
0.6875
1-1/2
12
1.5
1.4886
2.25
0.7500
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