# Torsion Constant for Square Cross-section

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

### Torsion Constant for Square Cross-section formula

$$\large{ J = 2.25 \; a^4 }$$

Where:

$$\large{ J }$$  (Greek symbol alpha) = torsion constant

$$\large{ a }$$ = half the edge length of a square