Piston rod column failure (buckling) can occur if the rod diameter is not sized to match the stroke and load. The manufacturer should be consulted for application assistance.
Column strength considerations: Standard size rods are recommended for use in cylinder applications where column strength, rod sag, or rate of cylinder return do not require an oversize rod. Being more flexible, standard rods absorb shock loads and minimize bearing loads caused by misalignments. For long push stroke cylinders, an oversize rod may be required to prevent column failure and rod bending. Total cylinder length when extended is considered in column strength.