Design a bolted fin plate (shear tab) connection - a beam web bolted to a plate welded to the supporting member - to Eurocode 3 (EN 1993-1-8) with the SCI P358 supplementary rules. The calculator verifies the bolt group (shear and bearing with the group eccentricity), the fin plate (gross/net/block shear, bending and lateral-torsional buckling of a long plate), the beam web (shear, block shear and shear-bending interaction), the weld, the supporting-member local shear and punching shear - each with its utilisation and a clear PASS/FAIL, shown on an interactive 3D model.