| Heavy Hex Nuts: Dimensions (ANSI/ASME B18.2.2) | |||||||||
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Nominal or Basic Major Diameter of Thread Click on the size to search products |
Width Across Flats (F) |
Width Across Corners (G) | Thickness of Hex Nuts (H) | ||||||
| Basic | Max | Min | Max | Min | Basic | Max | Min | ||
| 1/4 | 0.2500 | 1/2 | .500 | .488 | .577 | .556 | 15/64 | 0.250 | 0.218 |
| 5/16 | 0.3125 | 9/16 | .562 | .546 | .650 | .622 | 19/64 | 0.314 | 0.280 |
| 3/8 | 0.3750 | 11/16 | .688 | .669 | .794 | .763 | 23/64 | 0.377 | 0.341 |
| 7/16 | 0.4375 | 3/4 | .750 | .728 | .866 | .830 | 27/64 | 0.441 | 0.403 |
| 1/2 | 0.5000 | 7/8 | .875 | .850 | 1.010 | .969 | 31/64 | 0.504 | 0.464 |
| 9/16 | 0.5625 | 15/16 | .938 | .909 | 1.083 | 1.037 | 35/64 | 0.568 | 0.526 |
| 5/8 | 0.6250 | 1-1/16 | 1.062 | 1.031 | 1.227 | 1.175 | 39/64 | 0.631 | 0.587 |
| 3/4 | 0.7500 | 1-1/4 | 1.250 | 1.212 | 1.443 | 1.382 | 47/64 | 0.758 | 0.710 |
| 7/8 | 0.8750 | 1-7/16 | 1.438 | 1.394 | 1.660 | 1.589 | 55/64 | 0.885 | 0.833 |
| 1 | 1.0000 | 1-5/8 | 1.625 | 1.575 | 1.876 | 1.796 | 63/64 | 1.012 | 0.956 |
| 1-1/8 | 1.1250 | 1-13/16 | 1.812 | 1.756 | 2.093 | 2.002 | 1-7/64 | 1.139 | 1.079 |
| 1-1/4 | 1.2500 | 2 | 2.000 | 1.938 | 2.309 | 2.209 | 1-7/32 | 1.251 | 1.187 |
| 1-3/8 | 1.3750 | 2-3/16 | 2.188 | 2.119 | 2.526 | 2.416 | 1-11/32 | 1.378 | 1.310 |
| 1-1/2 | 1.5000 | 2-3/8 | 2.375 | 2.300 | 2.742 | 2.622 | 1-15/32 | 1.505 | 1.433 |
| 1-5/8 | 1.6250 | 2-9/16 | 2.562 | 2.481 | 2.959 | 2.828 | 1-19/32 | 1.632 | 1.556 |
| 1-3/4 | 1.7500 | 2-3/4 | 2.750 | 2.662 | 3.175 | 3.035 | 1-23/32 | 1.759 | 1.679 |
| 2 | 2.000 | 3-1/8 | 3.125 | 3.025 | 3.608 | 3.449 | 1-31/32 | 2.013 | 1.925 |
| 2-1/4 | 2.2500 | 3-1/2 | 3.500 | 3.388 | 4.041 | 3.862 | 2-13/64 | 2.251 | 2.155 |
| 2-1/2 | 2.5000 | 3-7/8 | 3.875 | 3.750 | 4.474 | 4.275 | 2-29/64 | 2.505 | 2.401 |
| 2-3/4 | 2.7500 | 4-1/4 | 4.250 | 4.112 | 4.907 | 4.688 | 2-45/64 | 2.759 | 2.647 |
| 3 | 3.000 | 4-5/8 | 4.625 | 4.475 | 5.340 | 5.102 | 2-61/64 | 3.013 | 2.893 |
| 3-1/4 | 3.2500 | 5 | 5.000 | 4.838 | 5.774 | 5.515 | 3-3/16 | 3.252 | 3.124 |
| 3-1/2 | 3.5000 | 5-3/8 | 5.375 | 5.200 | 6.207 | 5.928 | 3-7/16 | 3.506 | 3.370 |
| 3-3/4 | 3.7500 | 5-3/4 | 5.750 | 5.562 | 6.640 | 6.341 | 3-11/16 | 3.760 | 3.616 |
| 4 | 4.0000 | 6-1/8 | 6.125 | 5.925 | 7.073 | 6.755 | 3-15/16 | 4.014 | 3.862 |
* Click on the nominal size to find products.
| Heavy Hex Nuts: Grade A, Grade C, A194 Grade-2H, A563 Grade-DH, A563 Grade-DH3 | ||||||
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A 194 Grade-2H Heavy Hex Nut Marking
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A 563 Grade-DH Heavy Hex Nut Marking
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A 563 Grade-DH3 Heavy Hex Nut Marking
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| Description | A six-sided internally threaded fastener that is both wider and thicker than the same-sized finished hex nut. Heavy hex nuts that are 7/16" and smaller are doubled chamfered. Sizes larger than 7/16" can be either doubled chamfered or chamfered on top with a washer faced bearing surface. | |||||
| Applications | Grade-A nuts are used with low-carbon heavy hex bolts. | Grade-C nuts are used with A-325 structural bolts. | Grade-2H nuts are recommended for use with bolts in high-pressure and high-temperature service. | Grade-DH nuts are recommended for use with A-490, Type-1 structural bolts. | Grade-DH3 are recommended for use with A-490, Type 3 structural bolts. | |
| Material |
Carbon: 0.55% max; Phosphorus: 0.12% max; Sulfur: 0.023% max | Carbon: 0.55% max; Phosphorus: 0.12% max; Sulfur: 0.023% max | Carbon: 0.40% min; Manganese: 1.00% max; Phosphorus: 0.04% max; Sulfur: 0.05% max; Silicon: 0.40% max | Carbon: 0.20%-0.55% min; Manganese: 0.60% min; Phosphorus: 0.04% max; Sulfur: 0.05% max | Carbon: 0.20%-0.53% min; Manganese: 0.40% min; Phosphorus: 0.046% max; Sulfur: 0.05% max; Copper: 0.20% min; Chromium: 0.45% min (Either Nickel: 0.20% min or Molybdenum: 0.15% min, may be used) | |
| Heat Treatment | These nuts are heat treated by quenching in a liquid medium from a temperature above the transformation temperature and tempering at a temperature of at least 800 degrees (F). | These nuts are heat treated by quenching in a liquid medium from a temperature above the transformation temperature and tempering at a temperature of at least 850 degrees (F). | These nuts are heat treated by quenching in a liquid medium from a temperature above the transformation temperature and tempering at a temperature of at least 800 degrees (F). | These nuts are heat treated by quenching in a liquid medium from a temperature above the transformation temperature and tempering at a temperature of at least 800 degrees (F). | ||
| Core Hardness | Rockwell B68-C32 | Rockwell B78-C38 | Rockwell C24-C38 | Rockwell C24-C38 | Rockwell C24-C38 | |
| Proof Load |
Coarse thread; 100,000 psi; Fine thread; 90,000 psi |
144,000 psi | 150,000 psi | 175,000 psi | 175,000 psi | |
| Stainless Steel, 18-8 Heavy Hex Nuts | ||
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| Description | A six-sided internally threaded fastener that is both wider across flats and thicker than the same-sized finished hex nut made of 18-8 stainless steel. Stainless Steel Heavy hex nuts that are 7/16" and smaller are doubled chamfered. Sizes larger than 7/16" can be either doubled chamfered or chamfered on top with a washer faced bearing surface. | |
| Applications | This is the strongest of all 18-8 stainless steel hex nuts because of its greater length of thread engagement and greater resistance to dilation (widening or stretching). | |
| Material |
18-8 heavy hex nuts can be made from one of the following austenitic alloys: 303, 303Se, 304, XM7, which all have a chromium content of 18% and a nickel content of 8%. |
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| Hardness | 1/4" - 5/8": Rockwell B95-C32, 3/4"-1": Rockwell B80-C32 | |
| Proof Load |
1/4" - 5/8": 100,000 psi; 3/4" - 1": 85,000 psi |
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Additional Resources
