Heavy-duty hex nuts manufactured to ASME B18.2.2 standards for structural and industrial applications.
ASME B18.2.2 Heavy Hex Nuts feature increased thickness and width for enhanced load distribution and improved fastening strength. These heavy hex nuts are commonly used in structural steel assemblies, heavy machinery, construction systems, industrial equipment, and demanding high-load fastening environments.
| Nominal Size | Basic Major Diameter | Width Across Flats, F | Width Across Corners, G | Thickness, H | Maximum Runout of Bearing Surface to Thread Axis, FIM | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | Up to 150k psi | 150k psi + | ||
| 1/4 | 0.2500 | 1/2 | 0.488 | 0.500 | 0.556 | 0.577 | 15/64 | 0.218 | 0.250 | 0.017 | 0.011 |
| 5/16 | 0.3125 | 9/16 | 0.546 | 0.562 | 0.622 | 0.650 | 19/64 | 0.280 | 0.314 | 0.020 | 0.012 |
| 3/8 | 0.3750 | 11/16 | 0.669 | 0.688 | 0.763 | 0.794 | 23/64 | 0.341 | 0.377 | 0.021 | 0.014 |
| 7/16 | 0.4375 | 3/4 | 0.728 | 0.750 | 0.830 | 0.866 | 27/64 | 0.403 | 0.441 | 0.022 | 0.015 |
| 1/2 | 0.5000 | 7/8 | 0.850 | 0.875 | 0.969 | 1.010 | 31/64 | 0.464 | 0.504 | 0.023 | 0.016 |
| 9/16 | 0.5625 | 15/16 | 0.909 | 0.938 | 1.037 | 1.083 | 35/64 | 0.526 | 0.568 | 0.024 | 0.017 |
| 5/8 | 0.6250 | 1 1/16 | 1.031 | 1.062 | 1.175 | 1.227 | 39/64 | 0.587 | 0.631 | 0.025 | 0.018 |
| 3/4 | 0.7500 | 1 1/4 | 1.212 | 1.250 | 1.382 | 1.443 | 47/64 | 0.710 | 0.758 | 0.027 | 0.020 |
| 7/8 | 0.8750 | 1 7/16 | 1.394 | 1.438 | 1.589 | 1.660 | 55/64 | 0.833 | 0.885 | 0.029 | 0.022 |
| 1 | 1.0000 | 1 5/8 | 1.575 | 1.625 | 1.796 | 1.876 | 63/64 | 0.956 | 1.012 | 0.031 | 0.024 |
| 1 1/8 | 1.1250 | 1 13/16 | 1.756 | 1.812 | 2.002 | 2.093 | 1 7/64 | 1.079 | 1.139 | 0.033 | 0.027 |
| 1 1/4 | 1.2500 | 2 | 1.938 | 2.000 | 2.209 | 2.309 | 1 7/32 | 1.187 | 1.251 | 0.035 | 0.030 |
| 1 3/8 | 1.3750 | 2 3/16 | 2.119 | 2.188 | 2.416 | 2.526 | 1 11/32 | 1.310 | 1.378 | 0.038 | 0.033 |
| 1 1/2 | 1.5000 | 2 3/8 | 2.300 | 2.375 | 2.622 | 2.742 | 1 15/32 | 1.433 | 1.505 | 0.041 | 0.036 |
| 1 5/8 | 1.6250 | 2 9/16 | 2.481 | 2.562 | 2.828 | 2.959 | 1 19/32 | 1.556 | 1.632 | 0.044 | 0.038 |
| 1 3/4 | 1.7500 | 2 3/4 | 2.662 | 2.750 | 3.035 | 3.175 | 1 23/32 | 1.679 | 1.759 | 0.048 | 0.041 |
| 1 7/8 | 1.8750 | 2 15/16 | 2.844 | 2.938 | 3.242 | 3.392 | 1 27/32 | 1.802 | 1.886 | 0.051 | 0.044 |
| 2 | 2.0000 | 3 1/8 | 3.025 | 3.125 | 3.449 | 3.608 | 1 31/32 | 1.925 | 2.013 | 0.055 | 0.047 |
| 2 1/4 | 2.2500 | 3 1/2 | 3.388 | 3.500 | 3.862 | 4.041 | 2 13/64 | 2.155 | 2.251 | 0.061 | 0.052 |
| 2 1/2 | 2.5000 | 3 7/8 | 3.750 | 3.875 | 4.275 | 4.474 | 2 29/64 | 2.401 | 2.505 | 0.068 | 0.058 |
| 2 3/4 | 2.7500 | 4 1/4 | 4.112 | 4.250 | 4.688 | 4.907 | 2 45/64 | 2.647 | 2.759 | 0.074 | 0.064 |
| 3 | 3.0000 | 4 5/8 | 4.475 | 4.625 | 5.102 | 5.340 | 2 61/64 | 2.893 | 3.013 | 0.081 | 0.070 |
| 3 1/4 | 3.2500 | 5 | 4.838 | 5.000 | 5.515 | 5.774 | 3 3/16 | 3.124 | 3.252 | 0.087 | 0.075 |
| 3 1/2 | 3.5000 | 5 3/8 | 5.200 | 5.375 | 5.928 | 6.207 | 3 7/16 | 3.370 | 3.506 | 0.094 | 0.081 |
| 3 3/4 | 3.7500 | 5 3/4 | 5.562 | 5.750 | 6.341 | 6.640 | 3 11/16 | 3.616 | 3.760 | 0.100 | 0.087 |
| 4 | 4.0000 | 6 1/8 | 5.925 | 6.125 | 6.755 | 7.073 | 3 15/16 | 3.862 | 4.014 | 0.107 | 0.093 |
ASTM F467-13ε2 Table 1 lists 35 wrought alloys: 16 copper-base (C11000, C26000, C27000, C46200, C46400, C51000, C61300, C61400, C63000, C64200, C65100, C65500, C66100, C67500, C71000, C71500), 8 nickel-base (N10001, N10276, N04400, N04405, N05500, N06059, N06625, N06686), 3 aluminum-base (A92024, A96061, A96262) and 8 titanium (R50250, R50400, R50700, R56400, R56401, R52400, R58640, R55111). Table 2 gives hardness, proof stress and marking for each; alloys 59 and 686 have four strength grades and alloy 625 has two.
Unless otherwise specified, F467 nut dimensions are to ASME B18.2.2 (7.1) and threads are Class 2B to ASME B1.1 (7.2). F467 covers diameters 0.250 to 1.500 in. inclusive (1.1). Proof stress values in Table 2 are given for hex nuts and for heavy hex nuts.
Nuts are tested in full section (12.2.1) and hardness is taken on the top or bottom face (12.2.2) to ASTM E18 or E92: one reading for 1/4 to 7/16 in., the average of four readings 90 degrees apart for 1/2 in. and larger (13.2.2). Where both proof load and hardness are tested, proof load governs acceptance (6.2). A lot is up to 100 000 nuts of one type, alloy and temper, diameter and thread series (9.1). Sample size by lot: 50 and under, 2; 51 to 500, 3; 501 to 35 000, 5; 35 001 to 100 000, 8; acceptance number 0, rejection number 1 (10.1).
Every nut is marked with the manufacturer's symbol and the alloy/mechanical property marking from Table 2, raised or depressed (17.1), for example F 467C for naval brass 462 or F 467U for Ni-Cu alloy 400. Each shipping unit is marked with the ASTM designation, alloy number, property marking, size, manufacturer, number of pieces, country of origin and purchase order number (17.3).
