Structural · S-73N77

Welded Steel Moment Connection Access Hole Geometry

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Weld access holes in heavy steel framing connections per AWS D1.8 require a three-quarter inch diameter drilled hole with a minimum clearance based on the flange thickness tf. Dimensions include a one-half inch minimum offset, three times the flange thickness plus-or-minus one-half inch, and a maximum twenty-five degree angle typical for the cutback. Notes direct the fabricator to reference AWS D1.8 for additional geometric information.

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