This model presents an analytical approach for determining the torsional constant of an annular tube cross-section and compares it with numerical solutions from RFEM 5 and RSTAB 8 across various wall thicknesses. The description has been refined to eliminate redundant formulations. Integrated visual information illustrates the tube’s geometry, highlighting essential dimensions and wall-thickness variations. Serving as a verification example, it enhances the understanding of analytical versus numerical assessments in torsion analysis.