Hex nuts
ASME B18.2.2 – Heavy hex nuts, inch
ASME B18.2.2 · for ASTM A194 bolting. Dimensions from the HBS technical datasheet – in stock, with EN 10204 3.1 / 3.2 certificates.
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Dimensions
ASME B18.2.2 dimension table.
Dimensions in inches
| Nominal size | Threads per inch | Width across flats F | Width across corners G | Thickness H | |||||
|---|---|---|---|---|---|---|---|---|---|
| basic | max. | min. | max. | min. | basic | max. | min. | ||
| 1/4" | 20 UNC | 1/2 | 0.500 | 0.488 | 0.577 | 0.556 | 15/64 | 0.250 | 0.218 |
| 5/16" | 18 UNC | 9/16 | 0.562 | 0.546 | 0.650 | 0.622 | 19/64 | 0.314 | 0.280 |
| 3/8" | 16 UNC | 11/16 | 0.688 | 0.669 | 0.794 | 0.763 | 23/64 | 0.377 | 0.341 |
| 7/16" | 14 UNC | 3/4 | 0.750 | 0.728 | 0.866 | 0.830 | 27/64 | 0.441 | 0.403 |
| 1/2" | 13 UNC | 7/8 | 0.875 | 0.850 | 1.010 | 0.969 | 31/64 | 0.504 | 0.464 |
| 9/16" | 12 UNC | 15/16 | 0.938 | 0.909 | 1.083 | 1.037 | 35/64 | 0.568 | 0.526 |
| 5/8" | 11 UNC | 1-1/16 | 1.062 | 1.031 | 1.227 | 1.175 | 39/64 | 0.631 | 0.587 |
| 3/4" | 10 UNC | 1-1/4 | 1.250 | 1.212 | 1.443 | 1.382 | 47/64 | 0.758 | 0.710 |
| 7/8" | 9 UNC | 1-7/16 | 1.438 | 1.394 | 1.660 | 1.589 | 55/64 | 0.885 | 0.833 |
| 1" | 8 UNC | 1-5/8 | 1.625 | 1.575 | 1.876 | 1.796 | 63/64 | 1.012 | 0.956 |
| 1-1/8" | 8 UN | 1-13/16 | 1.812 | 1.756 | 2.093 | 2.002 | 1-7/64 | 1.139 | 1.079 |
| 1-1/4" | 8 UN | 2 | 2.000 | 1.938 | 2.309 | 2.209 | 1-7/32 | 1.251 | 1.187 |
| 1-3/8" | 8 UN | 2-3/16 | 2.188 | 2.119 | 2.526 | 2.416 | 1-11/32 | 1.378 | 1.310 |
| 1-1/2" | 8 UN | 2-3/8 | 2.375 | 2.300 | 2.742 | 2.622 | 1-15/32 | 1.505 | 1.433 |
| 1-5/8" | 8 UN | 2-9/16 | 2.562 | 2.481 | 2.959 | 2.828 | 1-19/32 | 1.632 | 1.556 |
| 1-3/4" | 8 UN | 2-3/4 | 2.750 | 2.662 | 3.175 | 3.035 | 1-23/32 | 1.759 | 1.679 |
| 1-7/8" | 8 UN | 2-15/16 | 2.938 | 2.844 | 3.392 | 3.242 | 1-27/32 | 1.886 | 1.802 |
| 2" | 8 UN | 3-1/8 | 3.125 | 3.025 | 3.608 | 3.449 | 1-31/32 | 2.013 | 1.925 |
| 2-1/4" | 8 UN | 3-1/2 | 3.500 | 3.388 | 4.041 | 3.862 | 2-13/64 | 2.251 | 2.155 |
| 2-1/2" | 8 UN | 3-7/8 | 3.875 | 3.750 | 4.474 | 4.275 | 2-29/64 | 2.505 | 2.401 |
| 2-3/4" | 8 UN | 4-1/4 | 4.250 | 4.112 | 4.907 | 4.688 | 2-45/64 | 2.759 | 2.647 |
| 3" | 8 UN | 4-5/8 | 4.625 | 4.475 | 5.340 | 5.102 | 2-61/64 | 3.013 | 2.893 |
| 3-1/4" | 8 UN | 5 | 5.000 | 4.838 | 5.774 | 5.515 | 3-3/16 | 3.252 | 3.124 |
| 3-1/2" | 8 UN | 5-3/8 | 5.375 | 5.200 | 6.207 | 5.928 | 3-7/16 | 3.506 | 3.370 |
| 3-3/4" | 8 UN | 5-3/4 | 5.750 | 5.562 | 6.640 | 6.341 | 3-11/16 | 3.760 | 3.616 |
| 4" | 8 UN | 6-1/8 | 6.125 | 5.925 | 7.073 | 6.755 | 3-15/16 | 4.014 | 3.862 |
- d
- Nominal size
- F
- Width across flats
- G
- Width across corners
Threads to ASME B1.1, class 2B: UNC up to 1", 8 UN for 1-1/8" and larger, as used for ASTM A193 / A320 studs.
Grades. ASTM A194 2H, 2HM, 4, 7, 7M, 8 and 8M; metric heavy hex nuts to ASME B18.2.4.6M. Configure at hbsfasteners.nl/products/hex-nuts.
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