Related Resources: hardware
Grade 4.6 Countersunk Bolt Capacities Table
Engineering ISO Metric Hardware Design Data
Engineering ANSI Hardware Design Data
See Explanatory notes given below table. BS 59501: 2000 BS 4190: 2001, BS 4933
Countersunk Bolt Loading Capacities Grade 4.6 material S275 Table
NonPreloaded Countersunk Bolts
Grade 4.6 Countersunk Bolts material S275
Diameter
of Bolt mm 
Tensile
Stress Area A_{t} mm² 
Tension
Capacity 
Shear
Capacity 
Bearing Capacity in kN (Minimum of P_{bb} and P_{bs} )
End distance equal to 2 x bolt diameter Thickness in mm of material passed through 

Nominal
0.8 A_{t} p_{t} P nom kN 
Exact A_{t} p_{t} P_{t} kN 
Single
Shear P_{s} kN 
Double
Shear 2 P_{s} kN 
5

6

7

8

9

10

12

15

20

25

30


12

84.3

16.2

20.2

13.5

27.0

11.0

16.6

22.1

27.6

33.1

38.6

49.7

66.2

93.8

121

149

16

157

30.1

37.7

25.1

50.2

7.36

14.7

22.1

29.4

36.8

44.2

58.9

81.0

118

155

191

20

245

47.0

58.8

39.2

78.4

0

9.20

18.4

27.6

36.8

46.0

64.4

92.0

138

184

230

22

303

58.2

72.7

48.5

97.0

0

5.06

15.2

25.3

35.4

45.5

65.8

96.1

147

197

248

24

353

67.8

84.7

56.5

113

0

0

11.0

22.1

33.1

44.2

66.2

99.4

155

210

265

27

459

88.1

110

73.4

147

0

0

3.11

15.5

27.9

40.4

65.2

102

165

227

289

30

561

108

135

89.8

180

0

0

0

6.90

20.7

34.5

62.1

104

173

242

311

The tensile stress area (A_{t} ) is obtained from standards
The tension capacity of the bolt is given by:
P_{nom} = 0.8p_{t}A_{t} Nominal
P_{t} = p_{t}A_{t} Exact
Where:
p_{t} is the tension strength of the bolt.
The shear capacity of the bolt is given by
P_{S} = p_{s} A_{s}
where:
p_{s} is the shear strength of the bolt
A_{s} is the shear area of the bolt.
In the table, As has been taken as equal to At .
The shear capacity given in the tables must be reduced for large packings, large grip lengths, kidney shaped slots or long joints when applicable.
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