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See Explanatory notes given below table. BS 5950-1: 2000 BS 4190: 2001, BS 4933

Grade 4.6 Countersunk Bolts material S355

 Diameter of Bolt mm Tensile Stress Area At mm² Tension Capacity Shear Capacity Bearing Capacity in kN (Minimum of Pbb and Pbs ) End distance equal to 2 x bolt diameter Thickness in mm of material passed through Nominal 0.8 At pt Pnom kN Exact At pt Pt kN Single Shear Ps kN Double Shear 2 Ps 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 (At ) is obtained from standards

The tension capacity of the bolt is given by:

Pnom = 0.8ptAt Nominal

Pt = ptAt Exact

Where:

pt is the tension strength of the bolt.

The shear capacity of the bolt is given by

PS = ps As

where:

ps is the shear strength of the bolt
As 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.