Common components of selective rack include the following:
Load beams (also called step beams or box beams).
Most Step Beams are roll formed members with a 1⅝” step along the top inside edge. This step is used to hold any load support components such as pallet supports or wire decks.
Box Beams have no inset steps; instead have four flat sides like a box. All load beams typically mount onto an upright frame column with integral rivets or hooks. Some systems utilize an extra clip or bolt to lock the beam to the upright.