Pallet racking and cantilever racking are two different kinds of racking system. Most racking systems are pallet racking systems, and that’s why SEMA approved racking inspectors specialise in that kind of racking system.
A pallet racking system uses pallets as shelves which can be adjusted vertically to store objects.
However, warehouses which are used to store long thin objects (usually timber) often use cantilever racking instead. Cantilever racking uses arms, rather than shelves, to hold up objects. The system also operates on a cantilever principle. That is to say, the upright is in the middle with two arms pointing out at either end to hold objects. Sometimes, however, the cantilever arms only point out at one end.