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Hex Jam Nuts

Hex Jam Nuts

Finished jam nuts, sometimes referred to as thin nuts, are approximately 65% as thick as a standard hex nut. Jam nuts are often used in pairs, with one nut tightened against the other to lock them in place, hence providing a secure and stable fastening solution. Heavy hex jam nuts are not very common. They are used where a large bearing surface is required and minimal clearance or thread engagement is available.

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Specifications & Technical Data

Finished Jam Nut Dimensions

Nominal Size Basic Major Diameter of Thread F G H1 Maximum Runout of Bearing Surface to Thread Axis, FIM
Width Across Flats Width Across Corners Thickness
Min Max Min Max Min Max
1/4 0.2500 0.428 0.438 0.488 0.505 0.150 0.163 0.015
5/16 0.3125 0.489 0.500 0.557 0.577 0.180 0.195 0.016
3/8 0.3750 0.551 0.563 0.628 0.650 0.210 0.227 0.017
7/16 0.4375 0.675 0.688 0.768 0.794 0.240 0.260 0.018
1/2 0.5000 0.736 0.750 0.840 0.866 0.302 0.323 0.019
9/16 0.5625 0.861 0.875 0.982 1.010 0.301 0.324 0.020
5/8 0.6250 0.922 0.938 1.051 1.083 0.363 0.387 0.021
3/4 0.7500 1.088 1.125 1.240 1.299 0.398 0.446 0.023
7/8 0.8750 1.269 1.312 1.447 1.516 0.458 0.510 0.025
1 1.0000 1.450 1.500 1.653 1.732 0.519 0.575 0.027
1-1/8 1.1250 1.631 1.688 1.859 1.949 0.579 0.639 0.030
1-1/4 1.2500 1.812 1.875 2.066 2.165 0.687 0.751 0.033
1-3/8 1.3750 1.994 2.062 2.273 2.382 0.747 0.815 0.036
1-1/2 1.5000 2.175 2.250 2.480 2.598 0.808 0.880 0.039
1-5/8 1.6250 2.35 2.43 2.679 2.805 0.868 0.944 0.044
1-3/4 1.7500 2.538 2.625 2.893 3.031 0.929 1.009 0.048
1-7/8 1.8750 2.722 2.813 3.103 3.247 0.989 1.073 0.051
2 2.0000 2.900 3.0000 3.306 3.464 1.050 1.138 0.055
2-1/4 2.2500 3.263 3.375 3.719 3.897 1.155 1.267 0.061
2-1/2 2.500 3.625 3.750 4.133 4.330 1.401 1.427 0.068
2-3/4 2.7500 3.988 4.125 4.546 4.763 1.522 1.556 0.074
3 3.000 4.350 4.500 4.959 5.196 1.643 1.685 0.081
3-1/4 3.2500 4.713 4.875 5.373 5.629 1.748 1.814 0.087
3-1/2 3.500 5.075 5.250 5.786 6.062 1.870 1.943 0.094
3-3/4 3.7500 5.438 5.625 6.199 6.495 1.990 2.072 0.100
4 4.0000 5.800 6.000 6.612 6.928 2.112 2.201 0.107

Heavy Jam Nut Dimensions

Nominal Size Basic Major Diameter of Thread F G H1 Maximum Runout of Bearing Surface to Thread Axis, FIM
Width Across Flats Width Across Corners
Thickness
Basic Min Max Min Max Basic Min Max
1/4 0.2500 1/2 0.488 0.500 0.556 0.577 11/64 0.156 0.188 0.017
5/16 0.3125 9/16 0.546 0.562 0.622 0.650 13/64 0.186 0.220 0.020
3/8 0.3750 11/16 0.669 0.688 0.763 0.794 15/64 0.216 0.252 0.021
7/16 0.4375 3/4 0.728 0.750 0.830 0.866 17/64 0.247 0.285 0.022
1/2 0.5000 7/8 0.850 0.875 0.969 1.010 19/64 0.277 0.317 0.023
9/16 0.5625 15/16 0.909 0.938 1.037 1.083 21/64 0.307 0.349 0.024
5/8 0.6250 1-1/16 1.031 1.062 1.175 1.227 23/64 0.337 0.381 0.025
3/4 0.7500 1-1/4 1.212 1.250 1.382 1.443 27/64 0.398 0.446 0.027
7/8 0.8750 1-7/16 1.394 1.438 1.589 1.660 31/64 0.458 0.510 0.029
1 1.0000 1-5/8 1.575 1.625 1.796 1.876 35/64 0.519 0.575 0.031
1-1/8 1.1250 1-13/16 1.756 1.812 2.002 2.093 39/64 0.579 0.639 0.033
1-1/4 1.2500 2 1.938 2.000 2.209 2.309 23/32 0.687 0.751 0.035
1-3/8 1.3750 2-3/16 2.119 2.188 2.416 2.526 25/32 0.747 0.815 0.038
1-1/2 1.5000 2-3/8 2.300 2.375 2.622 2.742 27/32 0.808 0.880 0.041
1-5/8 1.6250 2-9/16 2.481 2.562 2.828 2.959 29/32 0.868 0.944 0.044
1-3/4 1.7500 2-3/4 2.662 2.750 3.035 3.175 31/32 0.929 1.009 0.048
1-7/8 1.8750 2-15/16 2.844 2.938 3.242 3.392 1-1/32 0.989 1.073 0.051
2 2.0000 3-1/8 3.025 3.125 3.449 3.608 1-3/32 1.050 1.138 0.055
2-1/4 2.2500 3-1/2 3.388 3.500 3.862 4.041 1-13/64 1.155 1.251 0.061
2-1/2 2.5000 3-7/8 3.750 3.875 4.275 4.474 1-29/64 1.401 1.505 0.068
2-3/4 2.7500 4-1/4 4.112 4.250 4.688 4.907 1-37/64 1.522 1.634 0.074
3 3.0000 4-5/8 4.475 4.625 5.102 5.340 1-45/64 1.643 1.763 0.081
3-1/4 3.2500 5 4.838 5.000 5.515 5.774 1-13/16 1.748 1.876 0.087
3-1/2 3.5000 5-3/8 5.200 5.375 5.928 6.207 1-15/16 1.870 2.006 0.094
3-3/4 3.7500 5-3/4 5.562 5.750 6.341 6.640 2-1/16 1.990 2.134 0.100
4 4.000 6-1/8 5.925 6.125 6.755 7.073 2-3/16 2.112 2.264 0.107

Lock Washers Specifications

  • STANDARD (ASME/ANSI)
    • ASME B18.2.2 – 2012
  • METRIC (IFI)

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