Definition
A structural member added to a pallet to increase its rigidity and reduce deflection under load, particularly in racking applications. Stiffeners are typically boards or engineered wood elements placed between or beneath the deck boards, running perpendicular to the primary deck board direction. They distribute loads more evenly across the pallet span and are common in custom-designed pallets for heavy or concentrated loads.
Related Terms
Rackable Pallet
A pallet specifically designed and rated for use in pallet racking systems, where the pallet spans across two rack beams with its load suspended above the floor. Rackable pallets must have sufficient bending strength to support their rated load without excessive deflection (sagging) across the span. This is the most demanding application for a pallet, and rackable load capacity is always lower than static or dynamic load ratings. Typical rackable capacity for a GMA pallet ranges from 1,500 to 2,500 pounds.
Intermediate Deck
A layer of deck boards positioned between the top and bottom decks of a pallet, typically found in heavy-duty or specialty pallet designs. Intermediate decks add structural rigidity, distribute point loads more evenly, and increase the overall load-bearing capacity. They are used in applications where exceptionally heavy or concentrated loads would otherwise cause deflection or failure in a standard two-deck pallet design.
Deck Board
The flat boards that form the top and bottom surfaces of a pallet. Top deck boards provide the platform on which goods are placed, while bottom deck boards (also called bottom boards) provide stability and allow the pallet to be stored on flat surfaces. Deck board thickness, width, and spacing directly affect a pallet's load capacity and suitability for different applications.
Structural Grade
A lumber grading designation indicating that the wood meets specific strength and stiffness requirements for load-bearing applications. Structural-grade lumber is graded by certified inspectors using visual or machine stress rating (MSR) methods. In the pallet industry, structural-grade lumber is used for stringers, blocks, and lead boards in heavy-duty pallets where failure under load could cause safety hazards. Structural grading ensures predictable performance under engineering calculations.
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