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### Countersunk Bolt Grade 8.8 Material S275 Table

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

Countersunk Bolt Loading Capacities Grade 8.8 material S275 Table

Non-Preloaded Countersunk Bolts
Grade 8.8 Countersunk Bolts Material S275

 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 37.8 47.2 31.6 63.2 11.0 16.6 22.1 27.6 33.1 38.6 49.7 66.2 93.8 121 149 16 157 70.3 87.9 58.9 118 7.36 14.7 22.1 29.4 36.8 44.2 58.9 81.0 118 155 191 20 245 110 137 91.9 184 0 9.20 18.4 27.6 36.8 46.0 64.4 92.0 138 184 230 22 303 136 170 114 227 0 5.06 15.2 25.3 35.4 45.5 65.8 96.1 147 197 248 24 353 158 198 132 265 0 0 11.0 22.1 33.1 44.2 66.2 99.4 155 210 265 27 459 206 257 172 344 0 0 3.11 15.5 27.9 40.4 65.2 102 165 227 289 30 561 251 314 210 421 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.

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