1. Strength of a 20 mm diameter bolt of grade 4.6 for a single cover butt joint. The cover plate being 10 mm thick. Assume steel of grade Fe 410, ∫ͧ=410 MPa, for bolts of grade 4.6, f ͧ b - 400 MPa, Partial safety, factor for the material of the boll - 1.25 and net tensile stress area of 20 mm diameter bolt A nb 245 mm2, k-b -0.5 in single shear is :
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