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Engineering Standards

Definations

Measurement Standards

Standard is an artifact/ instrument/experimental set up whose value of quantity it represents. It is accompanied by a stated amount of uncertainty, called accuracy.

Calibration Laboratory

A Laboratory which measures, examines, calibrates or otherwise determines the characteristic or performance of Standard or instrument. (ISO Guide 2 Proposed Revision)

Laboratory Accreditation System

A system having its own rules or procedure and management for carrying out laboratory accredication.

Accrediting Body

A Government authority responsible for grant, renewal and withdrawal of accreditation.

Accredited Laboratory

A calibration laboratory to which accrediation has been granted.

Accreditation Criteria

A set of requirements used by an accrediting body which a calibration laboratory must meet in order to be accredited.

Laboratory Assessment

Examination of a calibration laboratory to evaluate its compliance with Accreditation Criteria.

Laboratory Assessor

An individual or a team who carried out some or all functions related to laboratory assessment.

Accredited Laboratory Calibration Report

A calibration report which includes a statement by the calibration laboratory that is accredited for the calibration done and that the calibration has been performed in accordance with the conditions prescribed by the accrediting body.

Approved Signatory

A person recognized by an accrediting body to sign the calibration reports issued by accredited laboratory.

Calibration

All the operations for the purpose of determining the capability / accuracy status of measuring instrument (and if necessary to determine other metrological values). Calibration can be carried out with a view to permit the use of instrument / artifact / equipment/technique as a standard.

Hardness Conversion Chart


HARDENED STEEL & HARD ALLOYS

ROCKWELL STANDARDS

VICKERS

BRINELL

C

A

D

HV

BHN

150 KG

60 KG

100 KG

10 KG

3000 Kg

DIAMOND INDENTER


100 mm Ball

80
79
78

92.0
91.5
91.0

86.5
85.5
84.5

1865
1787
1710

N.A.

77
76
75

90.5
90.0
89.5

84.0
83.0
82.5

1633
1556
1478

N.A.

74
73
72

89.0
88.5
88.0

81.5
81.0
80.0

1400
1323
1245

N.A.

71
70
69

87.0
86.5
86.0

79.5
78.5
78.0

1160
1076
1004

N.A.

68
67
66

85.6
85.0
84.5

76.9
76.1
75.4

940
900
865

N.A.

65
64
63

83.9
83.4
82.8

74.5
73.8
73.0

832
800
772

739
722
706

62
61
60

82.3
81.8
81.2

72.2
71.5
70.7

746
720
697

688
670
654

59
58
57

80.7
80.1
79.6

69.9
69.2
68.5

674
653
633

634
615
595

56
55
54

79.0
78.5
78.0

67.7
66.9
66.1

613
595
577

577
560
543

53
52
51

77.4
76.8
76.3

65.4
64.6
63.8

560
544
528

525
512
496

50
49
48

75.9
75.2
74.7

63.1
62.1
61.4

513
498
484

481
469
455

47
46
45

74.1
73.6
73.1

60.8
60.0
59.2

471
458
446

443
432
421

44
43
42

72.5
72.0
71.5

58.5
57.7
56.9

434
423
412

409
400
390

41
40
39

70.9
70.4
69.9

56.2
55.4
54.6

402
392
382

381
371
362

38
37
36

69.4
68.9
68.4

53.8
53.1
52.3

372
363
354

353
344
336

35
34
33

67.9
67.4
66.8

51.5
50.8
50.0

345
336
327

327
319
311

32
31
30

66.3
65.8
65.3

49.2
48.4
47.7

318
310
302

301
294
286

29
28
27

64.6
64.3
63.8

47.0
46.1
45.2

294
286
279

279
271
264

26
25
24

63.3
62.8
62.4

44.6
43.8
43.1

272
266
260

258
253
247

23
22
21

62.0
61.5
61.0

42.1
41.6
40.9

254
248
243

243
237
231

20

60.5

40.1

238

226






ROCKWELL
STANDARD

ROCKWELL STANDARD

BRINELL

BRINELL
VICKERS

B

F

E

H

K

A

HB

BHN
--------
HV

100kg
1/16" Ball

60kg
1/16"Ball

100kg
1/8"Ball

60kg
1/8"Ball

150kg
1/8"Ball

60kg
Diamond

500kg
100mm Ball

3000kg 10mm

100
99
98

N.A.

N.A.

N.A.

N.A.

61.5
60.9
60.2

201
195
189

240
234
228

97
96
95

N.A.

N.A.

N.A.

N.A.

59.5
58.9
58.3

184
179
175

222
216
210

94
93
92

N.A.

N.A.

N.A.



100

57.6
57.0
56.4

171
167
163

205
200
195

91
90
89

N.A.

N.A.

N.A.

99.5
98.5
98.0

55.8
55.2
54.6

160
157
154

190
185
180

88
87
86

N.A.

N.A.

N.A.

97.0
96.5
95.5

54.0
53.4
52.8

151
148
145

176
172
169

85
84
83

N.A.

N.A.

N.A.

94.5
94.0
93.0

52.3
51.7
51.1

142
140
137

165
162
159

82
81
80

N.A.

N.A.

N.A.

92.0
91.0
90.5

50.6
50.0
49.5

135
133
130

156
153
150

79
78
77

N.A.

N.A.

N.A.

89.5
88.5
88.0

48.9
48.4
47.9

128
126
124

147
144
141

76
75
74


99.6
99.1

N.A.

N.A.

87.0
86.0
85.0

47.3
46.8
46.3

122
120
118

139
137
135

73
72
71

98.5
98.0
97.4

--
--
100.00

N.A.

84.5
83.5
82.5

45.8
45.3
44.8

116
114
112

132
130
127

70
69
68

96.8
96.2
95.6

99.5
99.0
98.0

N.A.

81.5
81.0
80.0

44.3
43.8
43.3

110
109
107

125
132
121

67
66
65

95.1
94.5
93.9

97.5
97.0
96.0

N.A.

79.0
78.5
77.5

42.8
42.3
41.8

106
104
102

119
117
116

64
63
62

93.4
92.8
92.8

95.5
95.0
94.5

N.A.

76.0
74.5
74.0

41.4
40.9
40.4

101
99
98

114
112
110

61
60
59

91.7
91.1
90.5

93.5
93.0
92.5

N.A.

74.0
73.0
72.0

40.0
39.5
39.0

96
95
94

108
107
106

58
57
56

90.0
89.4
88.8

92.0
91.0
90.5

N.A.

71.0
70.5
69.5

38.7
38.1
37.7

92
91
90

104
103
101

55
54
53

88.2
87.7
87.1

90.0
89.5
89.0

N.A.

68.5
68.0
67.0

37.2
36.8
36.3

89
87
86

N.A.

52
51

86.5
86.0

88.0
87.5

N.A.

66.0
65.0

35.9
35.5

85
84

N.A.

50
49
48

85.4
84.8
84.3

87.0
86.5
85.5

N.A.

64.5
63.5
62.5

35.0
34.6
34.1

83
82
81

N.A.

47
46
45

83.7
83.1
82.6

85.0
84.5
84.0

N.A.

61.5
61.0
60.0

33.7
33.3
32.9

80
80
79

N.A.

44
43
42

82.0
81.4
80.8

83.5
82.5
82.0

N.A.

59.0
58.0
57.5

32.4
32.0
31.6

78
77
76

N.A.

41
40
39

80.3
79.7
79.1

81.5
81.0
80.0

N.A.

56.5
55.5
54.5

31.2
30.7
30.3

75
75
74

N.A.

38
37
36

78.6
78.0
77.4

79.5
79.0
78.5

N.A.

54.0
53.0
52.0

29.9
29.5
29.1

73
72
72

N.A.

35
34
33

76.9
76.3
75.7

78.0
77.0
76.5

N.A.

51.5
50.5
49.5

28.7
28.2
27.8

71
70
69

N.A.

32
31
30

75.2
74.6
74.0

76.0
75.5
75.0

N.A.

48.5
48.0
47.0

27.4
27.0
26.6

69
68
67

N.A.

29
28
27

73.5
73.0
72.5

74.0
73.5
73.0

N.A.

46.0
45.0
44.5

26.0
25.5
25.0

66
66
65

N.A.

26
25
24

72.0
71.0
70.5

72.5
72.0
71.0

N.A.

43.5
42.5
41.5

24.5
24.3
24.0

65
64
64

N.A.

23
22
21

70.0
69.5
69.0

70.5
70.0
69.5

N.A.

41.0
40.0
39.0

23.5
23.0
22.5

63
62
62

N.A.

20
19
18

68.5
68.0
67.0

68.5
68.0
67.5

N.A.

38.0
37.5
36.5

22.0
21.5
21.3

61
61
60

N.A.

17
16
15

66.5
66.0
65.5

67.0
66.5
65.5

N.A.

35.5
35.0
34.0

21.0
20.5
20.0

60
59
59

N.A.

14
13
12

65.0
64.5
64.0

65.0
64.5
64.0

N.A.

33.0
32.0
31.5

N.A.

59
58
58

N.A.

11
10
9

63.5
63.0
62.0

63.5
62.5
62.0

N.A.

30.5
29.5
29.0

N.A.

57
57
57

N.A.

8
7
6

61.5
61.0
60.5

61.5
61.0
60.5

N.A.

28.0
27.0
26.0

N.A.

56
56
55

N.A.

5
4
3

60.0
59.5
59.0

60.0
59.0
58.5

N.A.

25.5
24.5
23.5

N.A.

55
54
54

N.A.

2
1

58.0
57.5

58.5
57.5

N.A.

23
22

N.A.

54
54

N.A.





ISO 9001:2008


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