Flange coupling proportions: thickness of flange relative to shaft diameter Statement to evaluate: In a (cast iron) flange coupling, the flange thickness is taken as one-half of the shaft diameter (t ≈ 0.5d). Choose the correct option (True/False).

Design proportionStandard empirical proportions for an unprotected cast-iron flange coupling include: hub diameter ≈ 2d, hub length ≈ 1.5d, outside flange diameter ≈ 4d, and flange thickness t ≈ 0.5d.

NoteExact dimensions are refined by stress checks (keys, bolts, hub), but 0.5d is a widely used starting proportion.

Final AnswerTrue