Patent ID: 6872041

Claim:
A tension control bolt for joining structural steel members comprising: a head and a shank; said shank comprising a threaded section and a breakaway section; said threaded section intermediate said head and said breakaway section; said shank having a reduced diameter area intermediate said threaded section and said breakaway section; said breakaway section having an installation tool engagement surface; said head comprising a wrenching section and a flange section; said flange section including a bearing surface; said bearing surface having a bearing surface diameter; said wrenching section having a plurality of wrenching surfaces, said wrenching surfaces perpendicular to said flange bearing surface; said wrenching section having a flat width comprising the distance between opposed wrenching surfaces; said bearing surface diameter greater than said flat width; said shank threaded section having a shank diameter; said bearing surface diameter in the range of 1.75 to 2.625 times said shank diameter; said flange having a flange height; said flange height at least 0.091 times said shank diameter; said bolt having a bolt head height; said bolt head height including said flange height; said bolt head height in the range of 0.61 to 0.70 times said shank diameter; and said bolt operable for installation with a said structural steel member without installation of a washer intermediate said bearing surface and said member.