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ASME B18.2.2 Hex Coupling Nuts
Dimensions of Hex Coupling Nuts |
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Nominial Size |
Basic Major Diameter of Thread |
Widtf Across Flats, F Basic Min. Max |
Width Across Corners, G Min. Max. |
Length,H Basic Min. Max. |
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Basic |
Min. |
Max. |
Min. |
Max. |
Basic |
Min. |
Max. |
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#6 |
0.138 |
5/16 |
0.302 |
0.312 |
0.344 |
0.361 |
1/2 |
0.470 |
0.510 |
#8 |
0.164 |
5/16 |
0.302 |
0.312 |
0.344 |
0.361 |
5/8 |
0.595 |
0.645 |
#10 |
0.190 |
5/16 |
0.302 |
0.312 |
0.344 |
0.361 |
3/4 |
0.711 |
0.760 |
1/4 |
0.250 |
7/16 |
0.428 |
0.438 |
0.438 |
0.488 |
1 3/4 |
1.690 |
1.760 |
5/16 |
0.312 |
1/2 |
0.489 |
0.500 |
0.557 |
0.577 |
1 3/4 |
1.690 |
1.760 |
3/8 |
0.375 |
9/16 |
0.551 |
0.562 |
0.628 |
0.650 |
1 3/4 |
1.690 |
1.760 |
7/16 |
0.437 |
5/8 |
0.607 |
0.625 |
0.692 |
0.722 |
1 3/4 |
1.690 |
1.760 |
1/2 |
0.500 |
11/16 |
0.663 |
0.688 |
0.756 |
0.794 |
1 3/4 |
1.690 |
1.760 |
9/16 |
0.562 |
13/16 |
0.782 |
0.813 |
0.891 |
0.939 |
2 1/8 |
2.067 |
2.135 |
5/8 |
0.625 |
13/16 |
0.782 |
0.813 |
0.891 |
0.939 |
2 1/8 |
2.067 |
2.135 |
3/4 |
0.750 |
1 |
0.963 |
1.000 |
1.097 |
1.155 |
2 1/4 |
2.190 |
2.260 |
7/8 |
0.875 |
1 1/4 |
1.212 |
1.250 |
1.382 |
1.443 |
2 1/2 |
2.440 |
2.510 |
1 |
1.000 |
1 3/8 |
1.325 |
1.375 |
1.511 |
1.588 |
2 3/4 |
2.690 |
2.760 |
1 1/8 |
1.125 |
1 1/2 |
1.450 |
1.500 |
1.653 |
1.732 |
3 |
2.940 |
3.010 |
1 1/4 |
0.125 |
1 5/8 |
1.575 |
1.625 |
1.825 |
1.876 |
3 |
2.940 |
3.010 |
1 1/2 |
1.500 |
2 |
1.950 |
2.000 |
2.275 |
2.309 |
3 1/2 |
3.440 |
3.510 |
1 5/8 |
1.625 |
2 9/16 |
2.481 |
2.562 |
2.828 |
2.959 |
4 7/8 |
4.830 |
4.900 |
1 3/4 |
1.750 |
2 3/4 |
2.662 |
2.750 |
3.035 |
3.175 |
5 1/4 |
5.210 |
5.290 |
1 7/8 |
1.875 |
2 15/16 |
2.844 |
2.938 |
3.242 |
3.392 |
5 5/8 |
5.580 |
5.670 |
2 |
2.000 |
3 1/8 |
3.025 |
3.125 |
3.448 |
3.608 |
6 |
5.950 |
6.040 |
2 1/4 |
2.250 |
3 1/2 |
3.388 |
3.500 |
3.862 |
4.041 |
6 3/4 |
6.700 |
6.800 |
2 1/2 |
2.500 |
3 7/8 |
3.750 |
3.875 |
4.275 |
4.474 |
7 1/2 |
7.440 |
7.550 |
2 3/4 |
2.750 |
4 1/4 |
4.112 |
4.250 |
4.688 |
4.907 |
8 1/4 |
8.190 |
8.310 |
3 |
3.000 |
4 5/8 |
4.475 |
4.625 |
5.101 |
5.340 |
9 |
8.940 |
9.060 |
3 1/4 |
3.250 |
5 |
4.838 |
5.000 |
5.515 |
5.773 |
9 3/4 |
9.680 |
9.810 |
3 1/2 |
3.500 |
5 3/8 |
5.200 |
5.375 |
5.928 |
6.206 |
10 1/2 |
10.430 |
10.570 |
3 3/4 |
3.750 |
5 3/4 |
5.562 |
5.750 |
6.340 |
6.639 |
11 1/4 |
11.170 |
11.320 |
4 |
4.000 |
6 1/8 |
5.925 |
6.125 |
6.754 |
7.072 |
12 |
11.920 |
12.080 |
4 1/4 |
4.250 |
6 1/2 |
6.288 |
6.500 |
7.168 |
7.506 |
12 3/4 |
12.670 |
12.830 |
4 1/2 |
4.500 |
6 7/8 |
6.650 |
6.875 |
7.581 |
7.939 |
13 1/2 |
13.420 |
13.580 |
4 3/4 |
4.750 |
7 1/4 |
7.012 |
7.250 |
7.994 |
8.372 |
14 1/4 |
14.160 |
14.340 |
5 |
5.000 |
7 5/8 |
7.375 |
7.625 |
8.408 |
8.805 |
15 |
14.910 |
15.090 |
5 1/4 |
5.250 |
8 |
7.738 |
8.000 |
8.821 |
9.238 |
15 3/4 |
15.650 |
15.850 |
5 1/2 |
5.500 |
8 3/8 |
8.100 |
8.375 |
9.234 |
9.671 |
16 1/2 |
16.400 |
16.600 |
5 3/4 |
5.750 |
8 3/4 |
8.462 |
8.750 |
9.647 |
10.104 |
17 1/4 |
17.150 |
17.350 |
6 |
6.000 |
9 1/8 |
8.825 |
9.125 |
10.060 |
10.537 |
18 |
17.890 |
18.110 |
(1) Nuts shall be furnished without a hole, unless specially ordered by the purchaser. In some
applications it may be desirable to assure that the threaded parts joined by a coupling nut are
each engaged to approximately one-half nut thickness. As a visual inspection aid, a hole drilled
through one side of the nut is recommended. The hole should be located at mid-nut thickness,
and have a diameter of 0.2 to 0.4 times nominal nut size for sizes 21⁄2 in. and smaller, and 1 in.
for sizes 23⁄4 in. and larger.
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