Pin constraint

A pin constraint is applied to cylindrical surfaces to prevent the surfaces from moving or deforming in combinations of radial, axial, or tangential directions.

• Radial - Nodes along the cylindrical surfaces cannot move or deform radially.
• Axial - Nodes along the cylindrical surfaces cannot move in the axial (thrust) direction.
• Tangential - Nodes along the cylindrical surfaces cannot translate in the tangential direction (preventing rotation of the cylinder about its own axis).