Nuts
Rod Coupling Nuts
Dimensions of Hex Coupling Nuts
| Nominal Size or Basic Major Dia of Thread |
F | G | H | |||||
| WidthAcross Flats | Width Across Corners | Length | ||||||
| Basic | Max | Min | Max | Min | Basic | Max | Min | |
| #6 (0.138) | 5/16 | 0.312 | 0.302 | 0.361 | 0.344 | 1/2 | 0.510 | 0.470 |
| #8 (0.164) | 5/16 | 0.312 | 0.302 | 0.361 | 0.344 | 5/8 | 0.645 | 0.595 |
| #10 (0.190) | 5/16 | 0.312 | 0.302 | 0.361 | 0.344 | 3/4 | 0.760 | 0.711 |
| 1/4 (0 .250) | 7/16 | 0.438 | 0.428 | 0.505 | 0.488 | 1-3/4 | 1.760 | 1.690 |
| 5/16 (0.312) | 1/2 | 0.500 | 0.489 | 0.577 | 0.557 | 1-3/4 | 1.760 | 1.690 |
| 3/8 (0.375) | 9/16 | 0.562 | 0.551 | 0.650 | 0.628 | 1-3/4 | 1.760 | 1.690 |
| 7/16 (0.437) | 5/8 | 0.625 | 0.607 | 0.722 | 0.692 | 1-3/4 | 1.760 | 1.690 |
| 1/2 (0.500) | 11/16 | 0.688 | 0.663 | 0.794 | 0.756 | 1-3/4 | 1.760 | 1.690 |
| 9/16 (0.562) | 13/16 | 0.813 | 0.782 | 0.939 | 0.891 | 2-1/8 | 2.135 | 2.067 |
| 5/8 (0.625) | 13/16 | 0.813 | 0.782 | 0.939 | 0.891 | 2-1/8 | 2.135 | 2.067 |
| 3/4 (0.750) | 1 | 1.000 | 0.963 | 1.155 | 1.097 | 2-1/4 | 2.260 | 2.190 |
| 7/8 (0.875) | 1-1/4 | 1.250 | 1.212 | 1.443 | 1.382 | 2-1/2 | 2.510 | 2.440 |
| 1 (1.000) | 1-3/8 | 1.375 | 1.325 | 1.588 | 1.511 | 2-3/4 | 2.760 | 2.690 |
| 1-1/8 (1 .125) | 1-1/2 | 1.500 | 1.450 | 1.732 | 1.653 | 3 | 3.010 | 2.940 |
| 1-1/4 (0.125) | 1-5/8 | 1.625 | 1.575 | 1.876 | 1.825 | 3 | 3.010 | 2.940 |
| 1-1/2 (1.500) | 2 | 2.000 | 1.950 | 2.309 | 2.275 | 3-1/2 | 3.510 | 3.440 |
| 1-5/8 (1 .625) | 2-9/16 | 2.562 | 2.481 | 2.959 | 2.828 | 4-7/8 | 4.910 | 4.830 |
| 1-3/4 (1 .750) | 2-3/4 | 2.750 | 2.662 | 3.175 | 3.035 | 5-1/4 | 5.290 | 5.210 |
| 1-7/8 (1 .875) | 2-15/16 | 2.938 | 2.844 | 3.392 | 3.242 | 5-5/8 | 5.670 | 5.580 |
| 2 (2.000) | 3-1/8 | 3.125 | 3.025 | 3.608 | 3.448 | 6 | 6.040 | 5.950 |
| 2-1/4 (2.250) | 3-1/2 | 3.500 | 3.388 | 4.041 | 3.862 | 6-3/4 | 6.800 | 6.700 |
| 2-1/2 (2.500) | 3-7/8 | 3.875 | 3.750 | 4.474 | 4.275 | 7-1/2 | 7.550 | 7.440 |
| 2-3/4 (2.750) | 4-1/4 | 4.250 | 4.112 | 4.907 | 4.688 | 8-1/4 | 8.310 | 8.190 |
| 3 (3.000) | 4-5/8 | 4.625 | 4.475 | 5.340 | 5.101 | 9 | 9.060 | 8.940 |
| 3-1/4 (3.250) | 5 | 5.000 | 4.838 | 5.773 | 5.515 | 9-3/4 | 9.810 | 9.680 |
| 3-1/2 (3.500) | 5-3/8 | 5.375 | 5.200 | 6.206 | 5.928 | 10-1/2 | 10.570 | 10.430 |
| 3-3/4 (3.750) | 5-3/4 | 5.750 | 5.562 | 6.639 | 6.340 | 11-1/4 | 11 .320 | 11 .170 |
| 4 (4.000) | 6-1/8 | 6.125 | 5.925 | 7.072 | 6.754 | 12 | 12.080 | 11 .920 |
| 4-1/4 (4.250) | 6-1/2 | 6.500 | 6.288 | 7.506 | 7.168 | 12-3/4 | 12.830 | 12.670 |
| 4-1/2 (4.500) | 6-7/8 | 6.875 | 6.650 | 7.939 | 7.581 | 13-1/2 | 13.580 | 13.420 |
| 4-3/4 (4 .750) | 7-1/4 | 7.250 | 7.012 | 8.372 | 7.994 | 14-1/4 | 14.340 | 14.160 |
| 5 (5.000) | 7-5/8 | 7.625 | 7.375 | 8.805 | 8.408 | 15 | 15.090 | 14.910 |
| 5-1/4 (5.250) | 8 | 8.000 | 7.738 | 9.238 | 8.821 | 15-3/4 | 15.850 | 15.650 |
| 5-1/2 (5.500) | 8-3/8 | 8.375 | 8.100 | 9.671 | 9.234 | 16-1/2 | 16.600 | 16.400 |
| 5-3/4 (5.750) | 8-3/4 | 8.750 | 8.462 | 10.104 | 9.647 | 17-1/4 | 17.350 | 17.150 |
| 6 (6.000) | 9-1/8 | 9.125 | 8.825 | 10.537 | 10.060 | 18 | 18.110 | 17.890 |
