| 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. | |
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