The equations in the table below are valid for the elastic range of the material considered.

AA-SM-002-011 Torsion – Regular Sections – Solid Round Rod 2.
AA-SM-002-012 Torsion – Regular Sections – Thick Walled Round Tube 3.
AA-SM-002-013 Torsion – Regular Sections – Thin Walled Round Tube 4.
AA-SM-002-014 Torsion – Regular Sections – Solid Rectangular and Square Bar 
AA-SM-002-015 Torsion – Regular Sections – Thin Walled Rectangular or Square BarBar 6.
AA-SM-002-016 Torsion – Regular Sections – Solid Elliptical Section 7.
AA-SM-002-017 Torsion – Regular Sections – Thin Walled Elliptical Section 8.
AA-SM-002-018 Torsion – Regular Sections – Solid Hexagonal Rod 