ーExcerpt from SAE J417（revised in 1983）ー（500）（487）（475）（464）（18）（16）（14）（12）（10）（ 8）（ 6）（ 4）（ 2）（ 0）（Approximate （HS）Shore hardness（HRB）B scaleLoad 100kgfDiameter1.6mm（1/16in）Sphere（HRA）（HRD）A scaleD scaleLoad 60kgfLoad 100kgfDiamond conical Diamond conical penetratorpenetrator76.985.676.185.075.484.574.5（739）83.973.8（722）83.473.0（705）82.872.2（688）82.371.5（670）81.870.7（654）81.269.9（634）80.769.280.168.579.667.779.066.978.566.178.065.477.464.676.863.876.363.175.962.175.261.474.760.874.160.073.659.273.172.558.557.772.056.971.556.270.955.470.454.669.969.453.868.953.168.4（109.0）52.367.9（108.5）51.567.4（108.0）50.866.8（107.5）50.066.3（107.0）49.265.8（106.0）48.465.3（105.5）47.764.7（104.5）47.064.3（104.0）46.163.8（103.0）45.263.3（102.5）44.662.8（101.5）43.862.4（101.0）43.142.162.061.541.661.040.940.160.5－－－－－－－－－－－－－－－－－－－－（HB）Load for （HV）Vickers hardness（HRC）Rockwell hardnessLoad 150kgfDiamond conical penetrator－－－－－－－－－－－－－207520151950188018201760169516351580153014801435138513401295125012151180116011151080105510251000980950930910880860840825805785770760730705675650620600580550530515－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－ lacnhceTataDs・tcudorPi （1）1MPa＝1N/mm2Conversion table for approximate values for steel according to rockwell hardness C scaleSuperficial Rockwell68676665646362616059585756555453525150494847464544434241403938373635343332313029282726252423222120940900865832800772746720697674653633613595577560544528513498484471458446434423412402392382372363354345336327318310302294286279272266260254248243238230222213204196188180173166160451442432421409400390381371362353344336327319311301294286279271264258253247243237231226219212203194187179171165158152Standard ball615595577560543525512496481469455443432421409400390381371362353344336327319311301294286279271264258253247243237231226219212203194187179171165158152 100.0 99.0 98.5 97.8 96.7 95.5 93.9 92.3 90.7 89.5 87.1 85.5 83.5 81.7Rockwell superficial 10mm ball3000kgfhardnessTungsten carbide ballDiamond conical penetrator15－N scaleLoad 15kgf93.292.992.592.291.891.491.190.790.289.889.388.988.387.987.486.986.485.985.585.084.583.983.583.082.582.081.580.980.479.979.478.878.377.777.276.676.175.675.074.573.973.372.872.271.671.070.569.969.4－－－－－－－－－－30－N scaleLoad 30kgf84.483.682.881.981.180.179.378.477.576.675.774.873.973.072.071.270.269.468.567.666.765.864.864.063.162.261.360.459.558.657.756.855.955.054.253.352.151.350.449.548.647.746.845.945.044.043.242.341.5－－－－－－－－－－97959291888785838180787675747271696867666463626058575655545251504948474644434241414038383736353534333231292827262524241125Tensile strengthvalue）MPa（1）45－N scaleLoad 45kgf75.474.273.372.071.069.968.867.766.665.564.363.262.060.959.858.657.456.155.053.852.551.450.349.047.846.745.544.343.141.940.839.638.437.236.134.933.732.531.330.128.927.826.725.524.323.122.020.719.6－－－－－－－－－－Notes 1：the figures in blue are based on table 1 of ASTM E 140 （Adjusted by SAEーASM and ASTM in collaboration） SAE ：Society of Automotive Engineers ASM ：American Society for Metals ASTM：American Society of Testing MaterialsNotes 2：The figures in table are less frequently used values and are for reference only.Hardness Conversion Table
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