Approximate Conversion Table o f Hardness

Approximate conversion value for Brinell hardness. (The source: JIS HB Ferrous Materials and Metallurgy I -2005) *1

Brinell,HB 10mm ballHV ,Rockwell 3HSApprox.Brinell,HB 10mm ball,HVRockwell 3HSApprox.
Loa3000kgrsHRAHRBHRCHRDetensileLoa3000kgrsHRAHRBHRCHRDetensile
ard lTunstenickeA Scale,B Scale, Load 100kg,C Scale, LoadD Scale, Loadhorstrength (MPa)ard lTunstenickeA Scale,B Scale, Load 100kg,C Scale, LoadD Scale, Loadhorstrength (MPa)
tand balg carbide ballVLoad 60kg, Brale DidDiameter 1/16 in.150kg, brale100kg, BraleS2tand balg carbide ballVoad 60kg, Brale DidDiameter 1/16 in.150kg, brale100kg, BraleS2
SamonSteel balldiamondDiamondSamonSteel balldiamondDiamond
94085.668.076.99742942945573.445.759.7611510
92085.367.576.59641541544072.844.558.8591460
90085.067.076.19540140142572.043.157.8581390
(767)88084.766.475.79338838841071.441.856.8561330
(757)86084.465.975.39237537539670.640.455.7541270
(745)84084.165.374.89136336338370.039.154.6521220
(733)82083.864.774.39035235237269.3(110.0)37.953.8511180
(722)80083.464.073.88834134136068.7(109.0)36.652.8501130
(712)33133135068.1(108.5)35.551.9481095
(710)78083.063.373.38732132133967.5(108.0)34.351.0471060
(698)76082662572686
...31131132866.9(107.5)33.150.0461025
(684)74082.261.872.130230231966.3(107.0)32.149.3451005
(682)73782.261.772.08429329330965.7(106.0)30.948.343970
(670)72081.861.071.58328528530165.3(105.5)29.947.6950
(656)70081.360.170.827727729264.6(104.5)28.846.741925
(653)69781260070781
...26926928464.1(104.0)27.645.940895
(647)69081.159.770.526226227663.6(103.0)26.645.039875
(638)68080859270180255255269630(1020)25444238850
630670. 80.6. 58.8. 69.8248248261. 62.5. (101.0). 24.2. 43.237825
62766780.558.769.77924124125361.8100.022.842.036800
67780.759.170.023523524761.499.021.741.435785
60164079.857.368.77722922924160.898.220.540.534765
223223234973(188)
64079.857.368.7217217228. 96.4. (17.5)33725
57861579.156.067.77521221222295.5(16.0)705
60778.855.667.420720721894.6(15.2)32690
55559178.454.766.773205520120121293.8(13.8)31675
19719720792.8(12.7)30655
57978.054.066.1201519219220291.9(11.5)29640
53456977.853.565.871198518718719690.7(10.0)620
55377.152.565.0191518318319290.0(9.0)28615
51454776.952.164.770189017917918889.0(8.0)27600
17417418287.8(64)585
(495)53976.751.664.3185517017017886.8. (5.4)26570
53076.451.163.9182516716717586.0(4.4)560
49552876.351.063.8681820
16316317185.0(3.3)25545
1795036316156163829525
(477) −− −56 5085. 75.6− −. 49.6.2 627− −1780 17405 149149156− −. 80.8(0.9) −− −− 23505
47750875.649.6. 62.766174014314315078.722490
13713714376.421460
(461)49575.148.86191680
49174.948.5. 61.7167013113113774.0450
485121327204
46149174.9.61.76516701266.2035
12112112769.819415
44447474.347.261.0159511611612267.618400
− −− 444472 47274.2 74.2− −47.1 47.160.8 60.8− 631585 158511111111765.715385

Note : *1: This table is based on AMS Metals Handbook, the 8th Edition, Volume 1, and includes some information added to “Approx. tensile strength (MPa),” such as the values calculated in metric; and Brinell hardness that exceeds recommended values. *2: 1 MPa = 1 N/mm2 *3: Figures in ( ) are not commonly used. It’s just reference.