def AISC_J24(PlateThck):
    """
    From AISC WSD Table J2.4
    Minimum Size of Fillet Welds
    """
    #
    # To 1/4 inclusive
    if PlateThck < 6.35:
        # Minimum zise 1/8
        _MinWeldSize = 3.20
    # Over 3/4
    elif PlateThck > 19.0:
        # Minimum zise 5/16
        _MinWeldSize = 8.0
    
    else:
        # Over 1/4 to 1/2
        if PlateThck < 12.7:
            # Minimum zise 3/16
            _MinWeldSize = 4.80
        # Over 1/2 to 3/4
        else:
            # Minimum zise 1/4
            _MinWeldSize = 6.35
    #
    return _MinWeldSize