Hardness Conversions for Industrial Fasteners
Data for stainless steel industrial bolts, industrial machine screws and specialty and standard industrial fasteners from Elgin Fastener Group includes hardness conversions. The chart below shows a conversion between Brinell and Rockwell hardness numbers, as well as tensile strength.
| Brinell Indentation Diameter mm |
Brinell Hardness Number |
Rockwell Hardness Number |
Rockwell Superficial Hardness Number Superficial
Diamond Penetrator |
Tensile Strength (approx.) 1000 psi
|
| Standard Ball |
Tungsten- Carbide Ball |
B Scale |
C Scale |
15N Scale |
30N Scale |
45N Scale |
| 2.45 |
|
627 |
58.70 |
89.60 |
76.30 |
65.10 |
|
347 |
| 2.50 |
|
601 |
|
57.30 |
89.00 |
75.10 |
63.50 |
328 |
| 2.55 |
|
578 |
|
56.00 |
88.40 |
73.90 |
62.10 |
313 |
| 2.60 |
|
555 |
|
54.70 |
87.80 |
72.70 |
60.60 |
298 |
| 2.65 |
|
534 |
|
53.50 |
87.20 |
71.60 |
59.20 |
288 |
| 2.70 |
|
514 |
|
52.10 |
86.50 |
70.30 |
57.60 |
274 |
| 2.75 |
|
495 |
|
51.00 |
85.90 |
69.40 |
56.10 |
264 |
| 2.80 |
|
477 |
|
49.60 |
85.30 |
68.20 |
54.50 |
252 |
| 2.85 |
|
461 |
|
48.50 |
84.70 |
67.20 |
53.20 |
242 |
| 2.90 |
|
444 |
|
47.10 |
84.00 |
65.80 |
51.50 |
230 |
| 2.95 |
429 |
429 |
|
45.70 |
83.40 |
64.60 |
49.90 |
219 |
| 3.00 |
415 |
415 |
|
44.50 |
82.80 |
63.50 |
48.40 |
212 |
| 3.05 |
401 |
401 |
|
43.10 |
82.00 |
62.30 |
46.90 |
202 |
| 3.10 |
388 |
388 |
|
41.80 |
81.40 |
61.10 |
45.30 |
193 |
| 3.15 |
375 |
375 |
|
40.40 |
80.60 |
59.90 |
43.60 |
184 |
| 3.20 |
363 |
363 |
|
39.10 |
80.00 |
58.70 |
42.00 |
177 |
| 3.25 |
352 |
352 |
|
37.90 |
79.30 |
57.60 |
40.50 |
170 |
| 3.30 |
341 |
341 |
|
36.60 |
78.60 |
56.40 |
39.10 |
163 |
| 3.35 |
331 |
331 |
|
35.50 |
78.00 |
55.40 |
37.80 |
158 |
| 3.40 |
321 |
321 |
|
34.30 |
77.30 |
54.30 |
36.40 |
152 |
| 3.45 |
311 |
311 |
|
33.10 |
76.70 |
53.30 |
34.40 |
147 |
| 3.50 |
302 |
302 |
|
32.10 |
76.10 |
52.20 |
33.80 |
143 |
| 3.55 |
293 |
293 |
|
30.90 |
75.50 |
51.20 |
32.40 |
139 |
| 3.60 |
285 |
285 |
|
29.90 |
75.00 |
50.30 |
31.20 |
136 |
| 3.65 |
277 |
277 |
|
28.80 |
74.40 |
49.30 |
29.90 |
131 |
| 3.70 |
269 |
269 |
|
27.60 |
73.70 |
48.30 |
28.50 |
128 |
| 3.75 |
262 |
262 |
|
26.60 |
73.10 |
47.30 |
27.30 |
125 |
| 3.80 |
255 |
255 |
|
25.40 |
72.50 |
46.20 |
26.00 |
121 |
| 3.85 |
248 |
248 |
|
24.20 |
71.70 |
45.10 |
24.50 |
118 |
| 3.90 |
241 |
241 |
100.00 |
22.80 |
70.90 |
43.90 |
22.80 |
114 |
| 3.95 |
235 |
235 |
99.00 |
21.70 |
70.00 |
42.90 |
21.50 |
111 |
| 4.00 |
229 |
229 |
98.20 |
20.50 |
69.70 |
41.90 |
20.10 |
109 |
| 4.05 |
223 |
223 |
97.30 |
|
|
|
|
104 |
| 4.10 |
217 |
217 |
63.40 |
|
|
|
|
103 |
| 4.15 |
212 |
212 |
95.50 |
|
|
|
|
100 |
| 4.20 |
207 |
207 |
94.60 |
|
|
|
|
99 |
| 4.25 |
201 |
201 |
93.80 |
|
|
|
|
97 |
| 4.30 |
197 |
197 |
92.80 |
|
|
|
|
94 |
| 4.35 |
192 |
192 |
91.90 |
|
|
|
|
92 |
| 4.40 |
187 |
187 |
90.70 |
|
|
|
|
90 |
| 4.45 |
183 |
183 |
90.00 |
|
|
|
|
89 |
| 4.50 |
179 |
179 |
89.00 |
|
|
|
|
88 |
| 4.55 |
174 |
174 |
87.80 |
|
|
|
|
86 |
| 4.60 |
170 |
170 |
86.80 |
|
|
|
|
84 |
| 4.65 |
167 |
167 |
86.00 |
|
|
|
|
83 |
| 4.70 |
163 |
163 |
85.00 |
|
|
|
|
82 |
| 4.80 |
156 |
156 |
82.90 |
|
|
|
|
80 |
| 4.90 |
149 |
149 |
80.80 |
|
|
|
|
73 |
| 5.00 |
143 |
143 |
78.70 |
|
|
|
|
71 |
| 5.10 |
137 |
137 |
76.40 |
|
|
|
|
67 |
| 5.20 |
131 |
131 |
74.00 |
|
|
|
|
65 |
| 5.30 |
126 |
126 |
72.00 |
|
|
|
|
63 |
| 5.40 |
121 |
121 |
69.00 |
|
|
|
|
60 |
| 5.50 |
116 |
116 |
67.60 |
|
|
|
|
58 |
| 5.60 |
111 |
111 |
65.70 |
|
|
|
|
56 |
Torque Tensioning
Screw Point Types
Pilot Hole Sizes
Bolt & Screw Head Types
Weights per Thousand
Unified External Screw Threads
Rod & Bolt Diameters
Metric Conversions
Hole Sizes for Die Casting
Material Strength
Drive Tool Sizes
Hardness Conversions
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