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BS 2693-1-1956
Fine rod double studs with coarse teeth(b1=1d)
Nom
P
ds max
ds min
b1
L1 min
1/4
20
0.2206
0.2177
0.25
0.1250
5/16
18
0.2798
0.2767
0.3125
0.1563
3/8
16
0.3381
0.3349
0.375
0.1875
7/16
14
0.3952
0.3918
0.4375
0.2188
1/2
12
0.4503
0.4466
0.5
0.2500
9/16
12
0.5129
0.5091
0.5625
0.2813
5/8
11
0.5708
0.5668
0.625
0.3125
3/4
10
0.6903
0.686
0.75
0.3750
7/8
9
0.8085
0.8039
0.875
0.4375
1
8
0.9251
0.92
1
0.5000
1-1/8
7
1.0388
1.0335
1.125
0.5625
1-1/4
7
1.164
1.1585
1.25
0.6250
1-1/2
6
1.3991
1.3933
1.5
0.7500
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