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### Countersunk Bolt Grade 10.9 Loading Capacities Table

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

Countersunk Bolt Loading Capacities Grade 10.9 Table

Non-Preloaded Countersunk Bolts
Grade 10.9 Countersunk Bolts material S355

 Diameter of Bolt mm Tensile Stress Area A t 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 P nom 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 47.2 59.0 33.7 67.4 13.2 19.8 26.4 33.0 39.6 46.2 59.4 79.2 112 145 178 16 157 87.9 110 62.8 126 8.80 17.6 26.4 35.2 44.0 52.8 70.4 96.8 141 185 229 20 245 137 172 98.0 196 0 11.0 22.0 33.0 44.0 55.0 77.0 110 165 220 275 22 303 170 212 121 242 0 6.05 18.2 30.3 42.4 54.5 78.7 115 175 236 296 24 353 198 247 141 282 0 0 13.2 26.4 39.6 52.8 79.2 119 185 251 317 27 459 257 321 184 367 0 0 3.71 18.6 33.4 48.3 78.0 123 197 271 345 30 561 314 393 224 449 0 0 0 8.25 24.8 41.3 74.3 124 206 289 371

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.