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Lee Brinell Hardness Tester

Chart of expanded BNH readings

Chart of Lee Recommended chamber pressures by BNH hardness

 

 


Notes on chamber pressure calculations

 


(1)

Calculated as 1275 * BNH Rating. The Lee chart does not use a constant multiplier but seems to vary from 1275 to 1280

 

(2)

 

Calculated at 1422 * BNH rating. This is the "Traditional" multiplier value circulating around the net.

 

 


Depression
Diameter
Inches

Depression
Diameter
Millimeter

BNH


Maximum
Chamber
Pressure (1)

Maximum
Chamber
Pressure (2)


0.025 0.6350 85
108864 121415

0.026 0.6604 79
100597 112195

0.027 0.6858 73
93232 103981

0.028 0.7112 68
86641 96630

0.029 0.7366 63
80721 90027

0.030 0.7620 59
75382 84073

0.031 0.7874 55
70552 78686

0.032 0.8128 52
66167 73796

0.033 0.8382 49
62175 69343

0.034 0.8636 46
58530 65278

0.035 0.8890 43
55193 61556

0.036 0.9144 41
52129 58140

0.037 0.9398 39
49311 54997

0.038 0.9652 37
46713 52098

0.039 0.9906 35
44311 49420

0.040 1.0160 33
42087 46940

0.041 1.0414 31
40024 44639

0.042 1.0668 30
38107 42501

0.043 1.0922 28
36322 40509

0.044 1.1176 27
34657 38652

0.045 1.1430 26
33101 36918

0.046 1.1684 25
31646 35295

0.047 1.1938 24
30283 33774

0.048 1.2192 23
29004 32348

0.049 1.2446 22
27802 31008

0.050 1.2700 21
26672 29747

0.051 1.2954 20
25608 28560

0.052 1.3208 19
24604 27441

0.053 1.3462 19
23656 26384

0.054 1.3716 18
22761 25385

0.055 1.3970 17
21914 24440

0.056 1.4224 17
21112 23546

0.057 1.4478 16
20351 22698

0.058 1.4732 15
19630 21893

0.059 1.4986 15
18945 21129

0.060 1.5240 14
18293 20402

0.061 1.5494 14
17674 19711

0.062 1.5748 13
17084 19053

0.063 1.6002 13
16522 18426

0.064 1.6256 13
15986 17829

0.065 1.6510 12
15474 17258

0.066 1.6764 12
14985 16713

0.067 1.7018 11
14518 16192

0.068 1.7272 11
14072 15694

0.069 1.7526 11
13644 15218

0.070 1.7780 10
13235 14761

0.071 1.8034 10
12843 14324

0.072 1.8288 10
12467 13904

0.073 1.8542 9
12106 13502

0.074 1.8796 9
11760 13116

0.075 1.9050 9
11427 12745

0.076 1.9304 9
11108 12388

0.077 1.9558 8
10800 12045

0.078 1.9812 8
10505 11716

0.079 2.0066 8
10220 11398

0.080 2.0320 8
9946 11092

0.081 2.0574 8
9682 10798

0.082 2.0828 7
9427 10514

0.083 2.1082 7
9181 10240

0.084 2.1336 7
8944 9976

0.085 2.1590 7
8716 9721

0.086 2.1844 7
8495 9474

0.087 2.2098 6
8281 9236

0.088 2.2352 6
8075 9006

0.089 2.2606 6
7876 8784

0.090 2.2860 6
7683 8569

0.091 2.3114 6
7496 8360

0.092 2.3368 6
7315 8159

0.093 2.3622 6
7140 7963

0.094 2.3876 5
6971 7774

0.095 2.4130 5
6806 7591

0.096 2.4384 5
6647 7413

0.097 2.4638 5
6492 7241

0.098 2.4892 5
6342 7073

0.099 2.5146 5
6196 6911

0.100 2.5400 5
6055 6753







 
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             
             

 
 

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