Heavy Hex Jam

Heavy jam nuts tend to be thinner than standard heavy hex nuts; however, possess the same dimension, especially across corners and flats. There are two common applications of heavy hex jam nuts. It is possible to thread a heavy hex jam nut onto a bolt & run tight against a standard nut. This phenomenon locks the nut in place as well as prevents it from pulling back. These nuts are also used for leveling purposes. As hot-dip galvanizing generally adds 2.2 – 5 mils thickness to a fastener’s threaded portion, our galvanized heavy hex jam nuts get tapped oversize so as to balance the bolts’ corrosion resistant coating.

Available

Diameters: 1/2″ – 2″
Origin: Import
Finish: Plain and hot-dip galvanized

Dimensions

Click table to show drawingHeavy Hex Jam Nut
Nominal Size F C H Part Numbers
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min Plain Galvanized
38 1116 0.688 0.669 0.794 0.763 1564 0.252 0.216
12 78 0.875 0.850 1.010 0.969 1964 0.317 0.277
58 1116 1.062 1.031 1.227 1.175 2364 0.381 0.337
34 114 1.250 1.212 1.443 1.382 2764 0.446 0.398 18404
78 1716 1.438 1.394 1.660 1.589 3164 0.510 0.458
1 158 1.625 1.575 1.876 1.796 3564 0.575 0.519 17112 17113
118 11316 1.812 1.756 2.093 2.002 3964 0.639 0.579
114 2 2.000 1.938 2.309 2.209 2332 0.751 0.687 17114 17115
138 21316 2.188 2.119 2.526 2.416 2532 0.815 0.747
112 238 2.375 2.300 2.742 2.622 2732 0.880 0.808 17116 17117
158 2916 2.562 2.481 2.959 2.828 2932 0.944 0.868
134 234 2.750 2.662 3.175 3.035 3132 1.009 0.929 17118 17119
178 21516 2.938 2.844 3.392 3.242 1132 1.073 0.989
2 318 3.125 3.025 3.608 3.449 1332 1.138 1.050 17120 17121
214 312 3.500 3.388 4.041 3.862 11364 1.251 1.155 19847 19846
212 378 3.875 3.750 4.474 4.275 12964 1.505 1.401
234 414 4.250 4.112 4.907 4.688 13764 1.634 1.522
3 458 4.625 4.475 5.340 5.102 14564 1.763 1.643
314 5 5.000 4.838 5.774 5.515 11316 1.876 1.748
312 538 5.375 5.200 6.207 5.928 11516 2.006 1.870
334 534 5.750 5.562 6.640 6.341 2116 2.134 1.990
4 618 6.125 5.925 7.073 6.755 2316 2.264 2.112

Dimensions per ASME B18.2.2 1987 (R 1999)