These nuts are also referred to as hex couplers. These are used to connect two varied pieces of threaded material. Hex as well as heavy hex couplers are threaded right hand. If a right-hand left-hand coupler is required, using a sleeve nut is ideal.
Stock
Diameters: 1/2″ – 1″
Origin: Domestic and import
Finish: Plain and hot-dip galvanized
Grades: A563 (grades A and DH)
Available
Diameters: 1/2″ – 6″
Origin: Domestic and import
Finish: Plain and hot-dip galvanized
Grades: A563 (grades A, C, and DH), A194 grade 2H
Dimensions
Finished Hex Coupler Pattern
| Nominal Size | F | C | H | Part Numbers | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Width Across Flats | Width Across Corners | Length/Thickness | Import | |||||||
| Basic | Max | Min | Max | Min | Basic | Max | Min | Plain | Galvanized | |
| 1⁄2 | 11⁄16 | 0.688 | 0.663 | 0.794 | 0.756 | 13⁄4 | 1.760 | 1.690 | 12338 | 17525 |
| 5⁄8 | 13⁄16 | 0.813 | 0.782 | 0.939 | 0.891 | 21⁄8 | 2.135 | 2.067 | 12559 | 18195 |
| 3⁄4 | 1 | 1.000 | 0.963 | 1.155 | 1.097 | 21⁄4 | 2.260 | 2.190 | 12557 | 17526 |
| 7⁄8 | 11⁄4 | 1.250 | 1.212 | 1.443 | 1.382 | 21⁄2 | 2.510 | 2.440 | 12558 | 19504 |
| 1 | 13⁄8 | 1.375 | 1.325 | 1.588 | 1.511 | 23⁄4 | 2.760 | 2.690 | – | 18494 |
| 11⁄8 | 11⁄2 | 1.500 | 1.450 | 1.732 | 1.653 | 3 | 3.010 | 2.940 | 18394 | – |
| 11⁄4 | 15⁄8 | 1.625 | 1.575 | 1.876 | 1.825 | 3 | 3.010 | 2.940 | 18994 | 17529 |
| 11⁄2 | 2 | 2.000 | 1.950 | 2.309 | 2.275 | 31⁄2 | 3.510 | 3.440 | – | – |
| Dimensions per ASME B18.2.2 2010 Some dimensions may vary by supplier | ||||||||||
Heavy Hex Coupler Pattern
| Nominal Size | F | C | H | Part Numbers | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Width Across Flats | Width Across Corners | Thickness | A563DH Domestic | |||||||
| Basic | Max | Min | Max | Min | Basic | Max | Min | Plain | Galvanized | |
| 1⁄2 | 7⁄8 | 0.875 | 0.850 | 1.010 | 0.969 | 11⁄2 | – | – | – | – |
| 5⁄8 | 11⁄16 | 1.062 | 1.031 | 1.227 | 1.175 | 17⁄8 | – | – | 17543 | 17544 |
| 3⁄4 | 11⁄4 | 1.250 | 1.212 | 1.443 | 1.382 | 21⁄4 | – | – | – | 17527 |
| 7⁄8 | 17⁄16 | 1.438 | 1.394 | 1.660 | 1.589 | 25⁄8 | – | – | – | – |
| 1 | 15⁄8 | 1.625 | 1.575 | 1.876 | 1.796 | 3 | – | – | – | 12343 |
| 11⁄8 | 113⁄16 | 1.812 | 1.756 | 2.093 | 2.002 | 33⁄8 | – | – | – | – |
| 11⁄4 | 2 | 2.000 | 1.938 | 2.309 | 2.209 | 33⁄4 | – | – | 17547 | 17548 |
| 11⁄2 | 23⁄8 | 2.375 | 2.300 | 2.742 | 2.622 | 41⁄2 | – | – | 17551 | 17552 |
| 15⁄8 | 29⁄16 | 2.562 | 2.481 | 2.959 | 2.828 | 47⁄8 | 4.91 | 4.83 | – | – |
| 13⁄4 | 23⁄4 | 2.750 | 2.662 | 3.175 | 3.035 | 51⁄4 | 5.29 | 5.21 | 17553 | 17554 |
| 17⁄8 | 215⁄16 | 2.938 | 2.844 | 3.392 | 3.242 | 55⁄8 | 5.67 | 5.58 | – | – |
| 2 | 31⁄8 | 3.125 | 3.025 | 3.608 | 3.449 | 6 | 6.04 | 5.95 | 17555 | 17556 |
| 21⁄4 | 31⁄2 | 3.500 | 3.388 | 4.041 | 3.862 | 63⁄4 | 6.80 | 6.70 | – | – |
| 21⁄2 | 37⁄8 | 3.875 | 3.750 | 4.474 | 4.275 | 71⁄2 | 7.55 | 7.44 | – | – |
| 23⁄4 | 41⁄4 | 4.250 | 4.112 | 4.907 | 4.688 | 81⁄4 | 8.31 | 8.19 | – | – |
| 3 | 45⁄8 | 4.625 | 4.475 | 5.340 | 5.102 | 9 | 9.06 | 8.94 | – | – |
| 31⁄4 | 5 | 5.000 | 4.838 | 5.774 | 5.515 | 93⁄4 | 9.81 | 9.68 | – | – |
| 31⁄2 | 53⁄8 | 5.375 | 5.200 | 6.207 | 5.928 | 101⁄2 | 10.57 | 10.43 | – | – |
| 33⁄4 | 53⁄4 | 5.750 | 5.562 | 6.640 | 6.341 | 111⁄4 | 11.32 | 11.17 | – | – |
| 4 | 61⁄8 | 6.125 | 5.925 | 7.073 | 6.755 | 12 | 12.08 | 11.92 | – | – |
| 41⁄2 | 67⁄8 | 6.875 | 6.650 | 7.939 | 7.581 | 131⁄2 | – | – | – | – |
| 5 | 75⁄8 | 7.625 | 7.375 | 8.805 | 8.408 | 15 | – | – | – | – |
| Heavy coupler dimensions are not defined by ASME 18.2.2. The width across the flats and corners match the dimensions of a heavy hex nut. | ||||||||||