|
Hardness Comparison
A comparison of hardness values between Rockwell (A, B, C and D) Brinell and
Vickers scales.
| ROCKWELL |
SUPERFICIAL ROCKWELL |
BRINELL |
VICKERS OR FIRTH DIAMOND HARDNESS NUMBER |
SCLERO- SCOPE |
TENSILE STRENGTH |
| 10 m/m Ball |
| Diamond Brale |
1/16"
Bull |
"N" Brale Penetrater |
3000 kgm Load |
| 150
kgm C Scale |
60
kgm A Scale |
100
kgm D Scale |
100
kgm B Scale |
15
kg Load 15 N |
30
kg Load 30N |
45
kg Load 45N |
Diam.
of Ball Impression in m/m |
Hardness
Number |
- |
- |
Equivalent
1000 lb. Sq. In. |
| 80 |
92 |
87 |
- |
97 |
92 |
87 |
- |
- |
1865 |
- |
- |
| 79 |
92 |
86 |
- |
- |
92 |
87 |
- |
- |
1787 |
- |
- |
| 78 |
91 |
85 |
- |
96 |
91 |
86 |
- |
- |
1710 |
- |
- |
| 77 |
91 |
84 |
- |
- |
91 |
85 |
- |
- |
1633 |
- |
- |
| 76 |
90 |
83 |
- |
96 |
90 |
84 |
- |
- |
1556 |
- |
- |
| 75 |
90 |
83 |
- |
- |
89 |
83 |
- |
- |
1478 |
- |
- |
| 74 |
89 |
82 |
- |
95 |
89 |
82 |
- |
- |
1400 |
- |
- |
| 73 |
89 |
81 |
- |
- |
88 |
81 |
- |
- |
1323 |
- |
- |
| 72 |
88 |
80 |
- |
95 |
87 |
80 |
- |
- |
1245 |
- |
- |
| 71 |
87 |
80 |
- |
- |
87 |
79 |
- |
- |
1160 |
99 |
- |
| 70 |
87 |
79 |
- |
94 |
86 |
78 |
- |
- |
1076 |
98 |
- |
| 69 |
86 |
78 |
- |
94 |
85 |
77 |
- |
- |
1004 |
97 |
- |
| 68 |
86 |
77 |
- |
- |
85 |
79 |
- |
- |
942 |
96 |
- |
| 67 |
85 |
76 |
- |
93 |
84 |
75 |
- |
- |
894 |
95 |
- |
| 66 |
85 |
76 |
- |
93 |
83 |
73 |
- |
- |
854 |
93 |
- |
| 65 |
84 |
75 |
- |
92 |
82 |
72 |
2.25 |
745 |
820 |
91 |
- |
| 64 |
84 |
74 |
- |
- |
81 |
74 |
2.30 |
710 |
789 |
88 |
- |
| 63 |
83 |
73 |
- |
92 |
80 |
70 |
2.30 |
710 |
763 |
87 |
- |
| 62 |
83 |
73 |
- |
91 |
79 |
69 |
2.35 |
682 |
746 |
85 |
- |
| 61 |
82 |
72 |
- |
91 |
79 |
68 |
2.35 |
682 |
720 |
83 |
- |
| 60 |
81 |
71 |
- |
90 |
78 |
67 |
2.40 |
653 |
697 |
82 |
- |
| 59 |
81 |
70 |
- |
90 |
77 |
66 |
2.45 |
627 |
674 |
80 |
326 |
| 58 |
80 |
69 |
- |
89 |
76 |
65 |
2.55 |
578 |
653 |
78 |
315 |
| 57 |
80 |
69 |
- |
89 |
75 |
63 |
2.55 |
578 |
633 |
77 |
304 |
| 56 |
79 |
68 |
- |
88 |
74 |
62 |
2.60 |
555 |
613 |
75 |
294 |
| 55 |
79 |
67 |
- |
88 |
73 |
61 |
2.60 |
555 |
595 |
74 |
287 |
| 54 |
78 |
66 |
- |
87 |
72 |
60 |
2.65 |
534 |
577 |
72 |
279 |
| 53 |
77 |
65 |
- |
87 |
71 |
59 |
2.70 |
514 |
560 |
71 |
269 |
| 52 |
77 |
65 |
- |
86 |
70 |
57 |
2.75 |
495 |
544 |
69 |
261 |
| 51 |
76 |
64 |
- |
86 |
69 |
56 |
2.75 |
495 |
528 |
68 |
254 |
| 50 |
76 |
63 |
- |
86 |
69 |
55 |
2.80 |
477 |
513 |
67 |
245 |
| 49 |
75 |
62 |
- |
85 |
68 |
54 |
2.85 |
461 |
498 |
65 |
238 |
| 48 |
75 |
61 |
- |
85 |
67 |
53 |
2.90 |
444 |
484 |
64 |
232 |
| 47 |
74 |
61 |
- |
84 |
66 |
51 |
2.90 |
444 |
471 |
63 |
225 |
| 46 |
73 |
60 |
- |
84 |
65 |
50 |
2.95 |
432 |
458 |
62 |
219 |
| 45 |
73 |
59 |
- |
83 |
64 |
49 |
3.00 |
415 |
446 |
61 |
211 |
| 44 |
73 |
59 |
- |
83 |
63 |
48 |
3.00 |
415 |
434 |
59 |
206 |
| 43 |
72 |
58 |
- |
82 |
62 |
47 |
3.05 |
401 |
423 |
58 |
202 |
| 42 |
72 |
57 |
- |
82 |
61 |
46 |
3.10 |
388 |
412 |
56 |
198 |
| 41 |
71 |
56 |
- |
81 |
60 |
44 |
3.10 |
388 |
402 |
55 |
191 |
| 40 |
70 |
55 |
- |
80 |
60 |
43 |
3.15 |
375 |
392 |
54 |
185 |
| 39 |
70 |
55 |
- |
80 |
59 |
42 |
3.20 |
363 |
382 |
53 |
181 |
| 38 |
69 |
54 |
- |
79 |
58 |
41 |
3.25 |
352 |
372 |
51 |
176 |
| 37 |
69 |
53 |
109 |
79 |
57 |
40 |
3.30 |
341 |
363 |
50 |
171 |
| 36 |
68 |
52 |
109 |
78 |
56 |
39 |
3.35 |
331 |
354 |
49 |
168 |
| 35 |
68 |
52 |
108 |
78 |
55 |
37 |
3.35 |
331 |
345 |
48 |
163 |
| 34 |
67 |
51 |
108 |
77 |
54 |
36 |
3.40 |
321 |
336 |
46 |
159 |
| 33 |
67 |
50 |
107 |
77 |
53 |
38 |
3.45 |
311 |
327 |
45 |
154 |
| 32 |
66 |
49 |
106 |
76 |
52 |
34 |
3.50 |
302 |
318 |
44 |
150 |
| 31 |
66 |
48 |
106 |
76 |
51 |
33 |
3.55 |
293 |
310 |
43 |
146 |
| 30 |
65 |
48 |
105 |
75 |
50 |
32 |
3.60 |
285 |
302 |
42 |
142 |
| 29 |
65 |
47 |
104 |
75 |
50 |
30 |
3.65 |
277 |
294 |
41 |
138 |
| 28 |
64 |
46 |
103 |
74 |
49 |
29 |
3.70 |
269 |
286 |
40 |
134 |
| 27 |
64 |
45 |
103 |
73 |
48 |
28 |
3.75 |
262 |
279 |
39 |
131 |
| 26 |
63 |
45 |
102 |
73 |
47 |
27 |
3.80 |
255 |
272 |
38 |
126 |
| 25 |
63 |
44 |
101 |
72 |
46 |
26 |
3.80 |
255 |
266 |
37 |
124 |
| 24 |
62 |
43 |
100 |
72 |
45 |
24 |
3.85 |
248 |
260 |
37 |
122 |
| 23 |
62 |
42 |
99 |
71 |
44 |
23 |
3.90 |
241 |
254 |
36 |
118 |
| 22 |
62 |
42 |
99 |
71 |
43 |
22 |
3.95 |
235 |
248 |
35 |
116 |
| 21 |
61 |
41 |
98 |
70 |
42 |
21 |
4.00 |
229 |
243 |
35 |
113 |
| 20 |
61 |
40 |
97 |
69 |
42 |
20 |
4.05 |
223 |
238 |
34 |
111 |
| 18 |
- |
- |
95 |
- |
- |
- |
4.10 |
217 |
230 |
33 |
107 |
| 16* |
- |
- |
94 |
- |
- |
- |
4.15 |
212 |
222 |
32 |
102 |
| 14* |
- |
- |
92 |
- |
- |
- |
4.25 |
203 |
213 |
31 |
98 |
| 12* |
- |
- |
90 |
- |
- |
- |
4.35 |
192 |
204 |
29 |
92 |
| 10* |
- |
- |
89 |
- |
- |
- |
4.40 |
187 |
195 |
28 |
90 |
| 8* |
- |
- |
87 |
- |
- |
- |
4.50 |
179 |
187 |
27 |
87 |
| 6* |
- |
- |
85 |
- |
- |
- |
4.60 |
170 |
180 |
26 |
83 |
| 4* |
- |
- |
84 |
- |
- |
- |
4.65 |
166 |
173 |
25 |
79 |
| 2* |
- |
- |
82 |
- |
- |
- |
4.80 |
156 |
166 |
25 |
77 |
| 0* |
- |
- |
81 |
- |
- |
- |
4.80 |
156 |
160 |
25 |
74 |
| - |
- |
- |
79 |
- |
- |
- |
4.90 |
149 |
156 |
23 |
73 |
| - |
- |
- |
77 |
- |
- |
- |
5.00 |
143 |
150 |
22 |
70 |
| - |
- |
- |
74 |
- |
- |
- |
5.10 |
137 |
143 |
21 |
67 |
| - |
- |
- |
72 |
- |
- |
- |
5.20 |
131 |
137 |
- |
65 |
| - |
- |
- |
70 |
- |
- |
- |
5.30 |
126 |
132 |
20 |
62 |
| - |
- |
- |
68 |
- |
- |
- |
5.40 |
121 |
127 |
19 |
60 |
| - |
- |
- |
65 |
- |
- |
- |
5.50 |
116 |
122 |
18 |
58 |
| - |
- |
- |
- |
- |
- |
- |
5.60 |
112 |
117 |
15 |
56 |
|