HARDNESS CONVERSION TABLE

HRC

HRB

VPN
( HV )

Ultimate
kglmm
sq

Tensile
Strength
N/r-nm sq

HRC

HRB

VPN
( HV )

Ultimate
kglmm
sq

Tensile
Strength
N/mm sq

60
59
58
57
56

-
-
-
-
-

697
674
653
633
613

-
229.2
221.46
214.43
207.41

-
2335.55
2256.68
2185.04
2113.51

36
35
34
33
32

106
   108.5
108
   107.5
107

354
345
336
327
318

118.10
114.59
111.78
108.26
105.45

1205.6
1168.8
1140.1
1104.2
1075.5

55
54
53
52
51

-
-
-
-
-

595
577
560
544
528

201.78
195.46
189.13
184.21
177.80

2058.5
1993.6
1927.3
1879.9
1814.9

31
30
29
28
27

106
105.5
104.5
104
103

310
302
294
286
279

102.61
99.82
97.01
94.20
92.00

1046.6
1017.1
989.5
959.9
938.0

  50
49
48
47
46

-
-
-
-
-

513
498
484
471
458

172.80
168.04
163.11
158.19
153.97

1756.9
1714.0
1663.7
1613.5
1570.4

26
25
24
23
22

102.5
101.5
101
100
99

272
266
260
254
248

89.28
87.17
85.06
82.95
80.84

909.8
889.1
866.15
846.1
825.2

45
44
43
42
41

-
-
-
-
-

446
434
423
412
402

149.05
144.83
141.33
137.79
134.28

1520.2
1477.2
1441.5
1405.4
1369.6

21
20
18
16
14

98.5
97.8
96.7
95.5
93.9

243
238
230
222
213

79.70
77.34
74.52
71.70
68.90

812.9
788.8
760.1
731.3
601.8

40
39
38
37

-
-
-
-

392
382
372
363

130.78
127.24
123.73
12082

1333.9
1297.8
1262.0
1233.4

12
10
8
6

92.3
90.7
89.5
87.1

204
196
188
180

66.08
63.27
61.16
56.24

674.0
645.3
623.8
573.6

 

NOMINAL DIA

    1.5 

    2      2.5        3

      4

    5

       6

a~

    0.5

     0.7      0.8        1       1.3     1.7       2

            s

    0.17

     0.22      0.28

       0.33

        0.45      0.56       0.67

d 1

    1.6

     2.1       2.6        3.12        4.15      5.15       6.25

Tol

    +0.08
     -0

     +0.1
     -0		      +0.1
      -0

       +0.13
        -0

        +0.15
       -0		      +0.15
      -0		       +0.15
       -0

d 2

     1.4      1.9       2.35         2.85         3.8       4.8

        5.8 

Total            L    4 To 10 MM = + 0.05       12 To 50 MM = + 1.0       52 To 100 MM = + 1.5

 

                                                      ( LIGHT SERIES )                                      DIN  7346
NOMINAL DIAMETER 1)        2    2.5    3    3.5    4     4.5    5     6      7     8     10    11    12   13   14

S

    0.2   0.25   0.3  0.35   0.5   0.5   0.5  0.75   0.75   0.75    1   1     1  1.25   1.5

A

  0.35   0.45   0.5  0.6  0.7   0.8   1.6  1.6    1.6    2    2    2   2   2    2
  PRIOR           D 1
  TO FITTING           TOL
                         D 2		    2.3    2.8    3.3    3.8    4.4    4.8    5.4    6.4     7.5    8.5  10.5  11.5  12.5  13.5  14.5
        + 0.1                       + 0.2                                      + 0.3
  1.9   2.3   2.7   3.1   3.4    3.8    4.4   4.9      6    7     8.5   9.5    10.5    11   11.5
    FOR BOLT SIZE

-

-

-

-

-

   M3

-

   M4   M5   M6

-

   M8

-

   M10

-
 Appropriate Washer     
    DIN   125

-

-

-

-

-

   3.2

-

   4.3   5.3   6.4

-

   8.4

-

   10.5

-
         L                     TOL     4 TO 10 MM. = + 0.5                   11 & ABOVE = + 1.0 MM

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