Brinell and Rockwell Hardness Conversion Table Chart

These Conversion Tables presents data in the Rockwell A, B, C, D, E and F hardness range on the relationship among Brinell hardness, Vickers hardness, Rockwell superficial, hardness, and Shore Scleroscope hardness of nonaustenitic steels including carbon, alloy, and tool steels in the as-forged, annealed, normalized, and quenched and tempered conditions provided that they are homogeneous.

For plain carbon steels, the approximate relationship between the hardness and tensile strength is:
Tensile strength = Bhn × 515 (for Brinell numbers up to 175)
Tensile strength = Bhn × 490 (for Brinell numbers larger than 175)

The above formulas give the tensile strength in pounds per square inch for steels. These approximate relationships between hardness and tensile strength do not apply to nonferrous metals, with the possible exception of certain aluminum alloys.

Related:

Brinell Hardness Testing Equation

Table A
Brinell Hardness to Rockwell Hardness Conversion Table

Brinell Hardness Rockwell Hardness Tensile Strength
(Approximate)
Psi
Tungsten Carbide
Ball 3000 KG
A Scale 60KG B Scale 100KG C Scale 150KG
- 85.6 - 68.0 -
- 85.3 - 67.5 -
- 85.0 - 67.0 -
767 84.7 - 66.4 -
757 84.4 - 65.9 -
745 84.1 - 65.3 -
733 83.8 - 64.7 -
722 83.4 - 64.0 -
712 - - - -
710 83.0 - 63.3 -
698 82.6 - 62.5 -
684 82.2 - 61.8 -
682 82.2 - 61.7 -
670 81.8 - 61.0 -
656 81.3 - 60.1 -
653 81.2 - 60.0 -
647 81.1 - 59.7 -
638 80.8 - 59.2 329,000
630 80.6 - 58.8 324,000
627 80.5 - 58.7 323,000
601 79.8 - 57.3 309,000
578 79.1 - 56.0 297,000
555 78.4 - 54.7 285,000
534 77.8 - 53.5 274,000
514 76.9 - 52.1 263,000
495 76.3 - 51.0 253,000
477 75.6 - 49.6 243,000
461 74.9 - 48.5 235,000
444 74.2 - 47.1 225,000
429 73.4 - 45.7 217,000
415 72.8 - 44.5 210,000
401 72.0 - 43.1 202,000
388 71.4 - 41.8 195,000
375 70.6 - 40.4 188,000
363 70.0 - 39.1 182,000
352 69.3 - 37.9 176,000
341 68.7 - 36.6 170,000
331 68.1 - 35.5 166,000
321 67.5 - 34.3 160,000
311 66.9 - 33.1 155,000
302 66.3 - 32.1 150,000
293 65.7 - 30.9 145,000
285 65.3 - 29.9 141,000
277 64.6 - 28.8 137,000
269 64.1 - 27.6 133,000
262 63.6 - 26.6 129,000
255 63.0 - 25.4 126,000
248 62.5 - 24.2 122,000
241 61.8 100.0 22.8 118,000
235 61.4 99.0 21.7 115,000
229 60.8 98.2 20.5 111,000
223 - 97.3 20.0 -
217 - 96.4 18.0 105,000
212 - 95.5 17.0 102,000
207 - 94.6 16.0 100,000
201 - 93.8 15.0 98,000
197 - 92.8 - 95,000
192 - 91.9 - 93,000
187 - 90.7 - 90,000
183 - 90.0 - 89,000
179 - 89.0 - 87,000
174 - 87.8 - 85,000
170 - 86.8 - 83,000
167 - 86.0 - 81,000
163 - 85.0 - 79,000
156 - 82.9 - 76,000
149 - 80.8 - 73,000
143 - 78.7 - 71,000
137 - 76.4 - 67,000
131 - 74.0 - 65,000
126 - 72.0 - 63,000
121 - 69.8 - 60,000
116 - 67.6 - 58,000
111 - 65.7 - 56,000

Table B
Rockwell - Rockwell Superficial - Brinell - Vickers - Shore Hardness Conversion

Rockwell

Rockwell Superficial

Brinell

Vickers

Shore Hardness

A

B

C

D

E

F

15-N

30-N

45-N

30-T

3000 kg

500 kg

136

60kg Brale

100kg 1/16" Ball

150kg Brale

100kg Brale

100kg 1/8" Ball

60kg 1/16" Ball

15kg Brale

30kg Brale

45kg Brale

30 kg 1/16" Ball

10mm Ball Steel

10mm Ball Steel

Diamond Pyramid

Sciero-scope

86.5

---

70

78.5

---

---

94.0

86.0

77.6

---

---

---

1076

101

86.0

---

69

77.7

---

---

93.5

85.0

76.5

---

---

---

1044

99

85.6

---

68

76.9

---

---

93.2

84.4

75.4

---

---

---

940

97

85.0

---

67

76.1

---

---

92.9

83.6

74.2

---

---

---

900

95

84.5

---

66

75.4

---

---

92.5

82.8

73.2

---

---

---

865

92

83.9

---

65

74.5

---

---

92.2

81.9

72.0

---

739

---

832

91

83.4

---

64

73.8

---

---

91.8

81.1

71.0

---

722

---

800

88

82.8

---

63

73.0

---

---

91.4

80.1

69.9

---

705

---

772

87

82.3

---

62

72.2

---

---

91.1

79.3

68.8

---

688

---

746

85

81.8

---

61

71.5

---

---

90.7

78.4

67.7

---

670

---

720

83

81.2

---

60

70.7

---

---

90.2

77.5

66.6

---

654

---

697

81

80.7

---

59

69.9

---

---

89.8

76.6

65.5

---

634

---

674

80

80.1

---

58

69.2

---

---

89.3

75.7

64.3

---

615

---

653

78

79.6

---

57

68.5

---

---

88.9

74.8

63.2

---

595

---

633

76

79.0

---

56

67.7

---

---

88.3

73.9

62.0

---

577

---

613

75

78.5

120

55

66.9

---

---

87.9

73.0

60.9

---

560

---

595

74

78.0

120

54

66.1

---

---

87.4

72.0

59.8

---

543

---

577

72

77.4

119

53

65.4

---

---

86.9

71.2

58.6

---

525

---

560

71

76.8

119

52

64.6

---

---

86.4

70.2

57.4

---

500

---

544

69

76.3

118

51

63.8

---

---

85.9

69.4

56.1

---

487

---

528

68

75.9

117

50

63.1

---

---

85.5

68.5

55.0

---

475

---

513

67

75.2

117

49

62.1

---

---

85.0

67.6

53.8

---

464

---

498

66

74.7

116

48

61.4

---

---

84.5

66.7

52.5

---

451

---

484

64

74.1

116

47

60.8

---

---

83.9

65.8

51.4

---

442

---

471

63

73.6

115

46

60.0

---

---

83.5

64.8

50.3

---

432

---

458

62

73.1

115

45

59.2

---

---

83.0

64.0

49.0

---

421

---

446

60

72.5

114

44

58.5

---

---

82.5

63.1

47.8

---

409

---

434

58

72.0

113

43

57.7

---

---

82.0

62.2

46.7

---

400

---

423

57

71.5

113

42

56.9

---

---

81.5

61.3

45.5

---

390

---

412

56

70.9

112

41

56.2

---

---

80.9

60.4

44.3

---

381

---

402

55

70.4

112

40

55.4

---

---

80.4

59.5

43.1

---

371

---

392

54

69.9

111

39

54.6

---

---

79.9

58.6

41.9

---

362

---

382

52

69.4

110

38

53.8

---

---

79.4

57.7

40.8

---

353

---

372

51

68.9

110

37

53.1

---

---

78.8

56.8

39.6

---

344

---

363

50

68.4

109

36

52.3

---

---

78.3

55.9

38.4

---

336

---

354

49

67.9

109

35

51.5

---

---

77.7

55.0

37.2

---

327

---

345

48

67.4

108

34

50.8

---

---

77.2

54.2

36.1

---

319

---

336

47

66.8

108

33

50.0

---

---

76.6

53.3

34.9

---

311

---

327

46

66.3

107

32

49.2

---

---

76.1

52.1

33.7

---

301

---

318

44

65.8

106

31

48.4

---

---

75.6

51.3

32.5

---

294

---

310

43

65.3

105

30

47.7

---

---

75.0

50.4

31.3

---

286

---

302

42

64.7

104

29

47.0

---

---

74.5

49.5

30.1

---

279

---

294

41

64.3

104

28

46.1

---

---

73.9

48.6

28.9

---

271

---

286

41

63.8

103

27

45.2

---

---

73.3

47.7

27.8

---

264

---

279

40

63.3

103

26

44.6

---

---

72.8

46.8

26.7

---

258

---

272

39

62.8

102

25

43.8

---

---

72.2

45.9

25.5

---

253

---

266

38

62.4

101

24

43.1

---

---

71.6

45.0

24.3

---

247

---

260

37

62.0

100

23

42.1

---

---

71.0

44.0

23.1

82.0

240

201

254

36

61.5

99

22

41.6

---

---

70.5

43.2

22.0

81.5

234

195

248

35

61.0

98

21

40.9

---

---

69.9

42.3

20.7

81.0

228

189

243

35

60.5

97

20

40.1

---

---

69.4

41.5

19.6

80.5

222

184

238

34

59.0

96

18

---

---

---

---

---

---

80.0

216

179

230

33

58.0

95

16

---

---

---

---

---

---

79.0

210

175

222

32

57.5

94

15

---

---

---

---

---

---

78.5

205

171

213

31

57.0

93

13

---

---

---

---

---

---

78.0

200

167

208

30

56.5

92

12

---

---

---

---

---

---

77.5

195

163

204

29

56.0

91

10

---

---

---

---

---

---

77.0

190

160

196

28

55.5

90

9

---

---

---

---

---

---

76.0

185

157

192

27

55.0

89

8

---

---

---

---

---

---

75.5

180

154

188

26

54.0

88

7

---

---

---

---

---

---

75.0

176

151

184

26

53.5

87

6

---

---

---

---

---

---

74.5

172

148

180

26

53.0

86

5

---

---

---

---

---

---

74.0

169

145

176

25

52.5

85

4

---

---

---

---

---

---

73.5

165

142

173

25

52.0

84

3

---

---

---

---

---

---

73.0

162

140

170

25

51.0

83

2

---

---

---

---

---

---

72.0

159

137

166

24

50.5

82

1

---

---

---

---

---

---

71.5

156

135

163

24

50.0

81

0

---

---

---

---

---

---

71.0

153

133

160

24

49.5

80

---

---

---

---

---

---

---

70.0

150

130

---

---

49.0

79

---

---

---

---

---

---

---

69.5

147

128

---

---

48.5

78

---

---

---

---

---

---

---

69.0

144

126

---

---

48.0

77

---

---

---

---

---

---

---

68.0

141

124

---

---

47.0

76

---

---

---

---

---

---

---

67.5

139

122

---

---

46.5

75

---

---

---

99.5

---

---

---

67.0

137

120

---

---

46.0

74

---

---

---

99.0

---

---

---

66.0

135

118

---

---

45.5

73

---

---

---

98.5

---

---

---

65.5

132

116

---

---

45.0

72

---

---

---

98.0

---

---

---

65.0

130

114

---

---

44.5

71

---

---

100.0

97.5

---

---

---

64.2

127

112

---

---

44.0

70

---

---

99.5

97.0

---

---

---

63.5

125

110

---

---

43.5

69

---

---

99.0

96.0

---

---

---

62.8

123

109

---

---

43.0

68

---

---

98.0

95.5

---

---

---

62.0

121

107

---

---

42.5

67

---

---

97.5

95.0

---

---

---

61.4

119

106

---

---

42.0

66

---

---

97.0

94.5

---

---

---

60.5

117

104

---

---

41.8

65

---

---

96.0

94.0

---

---

---

60.1

116

102

---

---

41.5

64

---

---

95.5

93.5

---

---

---

59.5

114

101

---

---

41.0

63

---

---

95.0

93.0

---

---

---

58.7

112

99

---

---

40.5

62

---

---

94.5

92.0

---

---

---

58.0

110

98

---

---

40.0

61

---

---

93.5

91.5

---

---

---

57.3

108

96

---

---

39.5

60

---

---

93.0

91.0

---

---

---

56.5

107

95

---

---

39.0

59

---

---

92.5

90.5

---

---

---

55.9

106

94

---

---

38.5

58

---

---

92.0

90.0

---

---

---

55.0

104

92

---

---

38.0

57

---

---

91.0

89.5

---

---

---

54.6

102

91

---

---

37.8

56

---

---

90.5

89.0

---

---

---

54.0

101

90

---

---

37.5

55

---

---

90.0

88.0

---

---

---

53.2

99

89

---

---

37.0

54

---

---

89.5

87.5

---

---

---

52.5

---

87

---

---

36.5

53

---

---

89.0

87.0

---

---

---

51.8

---

86

---

---

36.0

52

---

---

88.0

86.5

---

---

---

51.0

---

85

---

---

35.5

51

---

---

87.5

86.0

---

---

---

50.4

---

84

---

---

35.0

50

---

---

87.0

85.5

---

---

---

49.5

---

83

---

---

34.8

49

---

---

86.5

85.0

---

---

---

49.1

---

82

---

---

34.5

48

---

---

85.5

84.5

---

---

---

48.5

---

81

---

---

34.0

47

---

---

85.0

84.0

---

---

---

47.7

---

80

---

---

33.5

46

---

---

84.5

83.0

---

---

---

47.0

---

79

---

---

33.0

45

---

---

84.0

82.5

---

---

---

46.2

---

79

---

---

32.5

44

---

---

83.5

82.0

---

---

---

45.5

---

78

---

---

32.0

43

---

---

82.5

81.5

---

---

---

44.8

---

77

---

---

31.5

42

---

---

82.0

81.0

---

---

---

44.0

---

76

---

---

31.0

41

---

---

81.5

80.5

---

---

---

43.4

---

75

---

---

30.8

40

---

---

81.0

79.5

---

---

---

43.0

---

74

---

---

30.5

39

---

---

80.0

79.0

---

---

---

42.1

---

74

---

---

30.0

38

---

---

79.5

78.5

---

---

---

41.5

---

73

---

---

29.5

37

---

---

79.0

78.0

---

---

---

40.7

---

72

---

---

29.0

36

---

---

78.5

77.5

---

---

---

40.0

---

71

---

---

28.5

35

---

---

78.0

77.0

---

---

---

39.3

---

71

---

---

28.0

34

---

---

77.0

76.5

---

---

---

38.5

---

70

---

---

27.8

33

---

---

76.5

75.5

---

---

---

37.9

---

69

---

---

27.5

32

---

---

76.0

75.0

---

---

---

37.5

---

68

---

---

27.0

31

---

---

75.5

74.5

---

---

---

36.6

---

68

---

---

26.5

30

---

---

75.0

74.0

---

---

---

36.0

---

67

---

---

26.0

29

---

---

74.0

73.5

---

---

---

35.2

---

66

---

---

25.5

28

---

---

73.5

73.0

---

---

---

34.5

---

66

---

---

25.0

27

---

---

73.0

72.5

---

---

---

33.8

---

65

---

---

24.5

26

---

---

72.5

72.0

---

---

---

33.1

---

65

---

---

24.2

25

---

---

72.0

71.0

---

---

---

32.4

---

64

---

---

24.0

24

---

---

71.0

70.5

---

---

---

32.0

---

64

---

---

23.5

23

---

---

70.5

70.0

---

---

---

31.1

---

63

---

---

23.0

22

---

---

70.0

69.5

---

---

---

30.4

---

63

---

---

22.5

21

---

---

69.5

69.0

---

---

---

29.7

---

62

---

---

22.0

20

---

---

68.5

68.5

---

---

---

29.0

---

62

---

---

21.5

19

---

---

68.0

68.0

---

---

---

28.1

---

61

---

---

21.2

18

---

---

67.5

67.0

---

---

---

27.4

---

61

---

---

21.0

17

---

---

67.0

66.5

---

---

---

26.7

---

60

---

---

20.5

16

---

---

66.5

66.0

---

---

---

26.0

---

60

---

---

20.0

15

---

---

65.5

65.5

---

---

---

25.3

---

59

---

---

---

14

---

---

65.0

65.0

---

---

---

24.6

---

59

---

---

---

13

---

---

64.5

64.5

---

---

---

23.9

---

58

---

---

---

12

---

---

64.0

64.0

---

---

---

23.5

---

58

---

---

---

11

---

---

63.5

63.5

---

---

---

22.6

---

57

---

---

---

10

---

---

62.5

63.0

---

---

---

21.9

---

57

---

---

---

9

---

---

62.0

62.0

---

---

---

21.2

---

56

---

---

---

8

---

---

61.5

61.5

---

---

---

20.5

---

56

---

---

---

7

---

---

61.0

61.0

---

---

---

19.8

---

56

---

---

---

6

---

---

60.5

60.5

---

---

---

19.1

---

55

---

---

---

5

---

---

60.0

60.0

---

---

---

18.4

---

55

---

---

---

4

---

---

59.0

59.5

---

---

---

18.0

---

55

---

---

---

3

---

---

58.5

59.0

---

---

---

17.1

---

54

---

---

---

2

---

---

58.0

58.0

---

---

---

16.4

---

54

---

---

---

1

---

---

57.5

57.5

---

---

---

15.7

---

53

---

---

---

0

---

---

57.0

57.0

---

---

---

15.0

---

53

---

---


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