ASME B18.2.2 Table 4 Hex Jam Nuts
ASME B18.2.2 Table 4 specifies hex jam nuts, which are thinner than standard hex nuts but thicker than flat nuts. They are designed specifically for jamming against another nut to prevent loosening under vibration, making them essential in dynamic fastening systems.
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Product introduction
ASME B18.2.2 Table 4 specifies hex jam nuts, which are thinner than standard hex nuts but thicker than flat nuts. They are designed specifically for jamming against another nut to prevent loosening under vibration, making them essential in dynamic fastening systems.
Common Specifications
| Materials | Carbon steel |
| Class | 5, 6, 8, 10 |
| Range | 1/4" - 1" |
| Thread | Coarse , Fine, Extra Fine, Special-Fine |
| Surface | Plain, zinc plated, hot-dip galvanized, GEOMET, ZINC-NICKLE, DACROMATE etc. |
Key Features
- Intermediate thickness between standard and flat nuts
- Specifically designed for jam nut locking function
- Conforms to ASME B18.2.2 Table 4
- Available in high-strength grades including 2H
- Widely used in vibration-prone assemblies
Application industry
- Heavy equipment and off-road vehicles
- Rail and transit systems
- Pump and compressor assemblies
- Industrial fastening with vibration
data table
| Size | 1/4" | 5/16" | 3/8" | 7/16 | 1/2 | 9/16 | 5/8" | 3/4" | 7/8" | 1" | 1-1/8" | 1-1/4" | 1-3/8" | 1-1/2" | 1-5/8" | 1-3/4" | 1-7/8" | 2" | 2-1/4" | 2-1/2" | 2-3/4" | 3" | 3-1/4" | 3-1/2" | 3-3/4" | 4" |
| UNC | 20 | 18 | 16 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 7 | 6 | 6 | 6 | 5 | 6 | 4.5 | 4.5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| AF Min (inch) | 0.428 | 0.489 | 0.551 | 0.675 | 0.736 | 0.861 | 0.922 | 1.088 | 1.269 | 1.450 | 1.631 | 1.812 | 1.994 | 2.175 | 2.350 | 2.538 | 2.722 | 2.900 | 3.263 | 3.625 | 3.988 | 4.350 | 4.713 | 5.075 | 5.438 | 5.800 |
| AF Max (inch) | 0.438 | 0.500 | 0.563 | 0.688 | 0.750 | 0.875 | 0.938 | 1.125 | 1.312 | 1.500 | 1.688 | 1.875 | 2.062 | 2.250 | 2.430 | 2.625 | 2.813 | 3.000 | 3.375 | 3.750 | 4.125 | 4.500 | 4.875 | 5.250 | 5.625 | 6.000 |
| AC Min (inch) | 0.488 | 0.557 | 0.628 | 0.768 | 0.840 | 0.982 | 1.051 | 1.240 | 1.447 | 1.653 | 1.859 | 2.066 | 2.273 | 2.480 | 2.679 | 2.893 | 3.103 | 3.306 | 3.719 | 4.133 | 4.546 | 4.959 | 5.373 | 5.786 | 6.199 | 6.612 |
| AC Max (inch) | 0.505 | 0.577 | 0.650 | 0.794 | 0.866 | 1.010 | 1.083 | 1.299 | 1.516 | 1.732 | 1.949 | 2.165 | 2.382 | 2.598 | 2.805 | 3.031 | 3.247 | 3.464 | 3.897 | 4.330 | 4.763 | 5.196 | 5.629 | 6.062 | 6.495 | 6.928 |
| T Min (inch) | 0.150 | 0.180 | 0.210 | 0.240 | 0.302 | 0.301 | 0.363 | 0.398 | 0.458 | 0.519 | 0.579 | 0.687 | 0.747 | 0.808 | 0.868 | 0.929 | 0.989 | 1.050 | 1.155 | 1.401 | 1.522 | 1.643 | 1.748 | 1.870 | 1.990 | 2.112 |
| T Max (inch) | 0.163 | 0.195 | 0.227 | 0.260 | 0.323 | 0.324 | 0.387 | 0.446 | 0.510 | 0.575 | 0.639 | 0.751 | 0.815 | 0.880 | 0.944 | 1.009 | 1.073 | 1.138 | 1.267 | 1.427 | 1.556 | 1.685 | 1.814 | 1.943 | 2.072 | 2.201 |
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