Jam Nuts

    Jam Nuts

     

    Hex jam nuts are thinner than a hex nut but have the same dimension across the flats and corners. Hex jam nuts have two common applications. A jam nut can be threaded onto a bolt and run tight against the standard nut which will lock the nut in place and prevent it from backing off. Jam nuts are sometimes used for leveling purposes as well.

    Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized hex jam nuts are tapped oversize to compensate for the corrosion resistant coating on the bolts.

    Dimensions

     

    Nominal Size F C H
    Width Across Flats Width Across Corners Thickness
    Basic Max Min Max Min Basic Max Min
    3/8 9/16 0.562 0.551 0.650 0.628 7/32 0.227 0.210
    1/2 3/4 0.750 0.736 0.866 0.840 5/16 0.323 0.302
    5/8 15/16 0.938 0.922 1.083 1.051 3/8 0.387 0.363
    3/4 1-1/8 1.125 1.088 1.299 1.240 27/64 0.446 0.398
    7/8 1-5/16 1.312 1.269 1.516 1.447 31/64 0.510 0.458
    1 1-1/2 1.500 1.450 1.732 1.653 35/64 0.575 0.519
    1-1/8 1-11/16 1.688 1.631 1.949 1.859 39/64 0.639 0.579
    1-1/4 1-7/8 1.875 1.812 2.165 2.066 23/32 0.751 0.687
    1-3/8 2-1/16 2.062 1.994 2.382 2.273 25/32 0.815 0.747
    1-1/2 2-1/4 2.250 2.175 2.598 2.480 27/32 0.880 0.808
    Téléphone: 450-420-1839